capital region air quality management framework 2014 AMBIENT AIR QUALITY ASSESSMENT SUMMARY REPORT July 2016

Transcription

1 capital region air quality management framework 2014 AMBIENT AIR QUALITY ASSESSMENT SUMMARY REPORT July 2016

2 overview PURPOSE Ambient air quality Assessment Summary Reports are produced annually under the Capital Region Air Quality Management Framework 1. The purpose of these reports is to assign an ambient air quality level to each monitoring station in the Capital Region for the Framework s four contaminants of concern (nitrogen dioxide, sulphur dioxide, fine particulate matter, and ozone). See the Background to the Capital Region Assessment Summary Reports 2 for descriptions of: the four contaminants of concern; the air monitoring in the region; and the triggers, limits, and levels for the contaminants. The Implementation Progress Report 3 provides analysis of how the sources and other factors have influenced the ambient air quality levels and information about management actions chosen or assigned to stations in the Capital Region. Note, for references to the current and previous Assessment Summary Reports: The 2011 Assessment Summary Report contains level assignments for: NO 2 and SO 2 based on the 2011 data; and for PM 2.5 and O 3 based on the data period. The 2012 Assessment Summary Report contains level assignments for: NO 2 and SO 2 based on the 2012 data; and for PM 2.5 and O 3 based on the data period. The 2013 Assessment Summary Report contains level assignments for: NO 2 and SO 2 based on the 2013 data; and for PM 2.5 and O 3 based on the data period. The 2014 Assessment Summary Report contains level assignments for: NO 2 and SO 2 based on the 2014 data; and for PM 2.5 and O 3 based on the data period. The 2014 ambient air quality level assignments and historical trends are outlined on the following pages. Air quality level assignments for each air quality parameter in the Capital Region Air Quality Management Framework correspond to specific management intents. Historical trends for each air quality parameter consist of graphical display of calculated metric concentrations from 2004 to 2014 for NO 2 and SO 2 and to for PM 2.5 and O 3 (the assessment of PM 2.5 and O 3 are based on three year averages). Historical trends for upper range (NO 2 and SO 2 ), 1 Alberta Environment and Sustainable Resource Development Capital Region Air Quality Management Framework. 2 Alberta Environment and Sustainable Resource Development Backgrounder Ambient Air Quality Assessment Summary Reports. documents/backgrounderambientairqualityassessment.pdf 3 The first Implementation Progress Report is currently in development, with an update date of July

3 98 th percentile of 24 hour averages (PM 2.5 ) and 4 th highest daily 8-hour maximum (O 3 ) are intended to highlight the frequency and magnitude of peak (short-term elevated) concentrations. In this report, historical trends are described based on the absolute change in concentrations from the beginning to the end of the analyzed period. An increasing trend may signify that peak concentrations are increasing in magnitude or occurring more frequently. Likewise, a decreasing trend may signify that peak concentrations are decreasing in magnitude or occurring less frequently. Historical trends for the annual average (NO 2, SO 2, PM 2.5 ) are intended to highlight year-round large scale changes in observed concentrations. NITROGEN DIOXIDE ANNUAL AVERAGE Level Assignment The Edmonton Central monitoring station is assigned to Level 2, a decrease from the Level 3 assignment the station received in the 2013 Assessment Summary Report. Fort Saskatchewan monitoring stations is assigned to Level 1, a decrease from the Level 2 assignment the station received in the 2013 Assessment Summary Report. All other monitoring stations remain assigned to the same levels as the 2013 Assessment Summary Report. Table 1 lists the results of the nitrogen dioxide annual average assessment and ambient air quality level assignment. 3

4 Table 1: Nitrogen Dioxide Annual Average Ambient Air Quality Level Assignment Edmonton Central Edmonton East Edmonton South Elk Island Fort Saskatchewan Genesee Lamont Meadows Range Road 220 Redwater Ross Creek Tomahawk Wagner Bruderheim Sherwood Park Gold Bar Lehigh Year Assessment Level Trends Observations from urban monitoring stations (Edmonton Central, Edmonton East, Edmonton South, Fort Saskatchewan) have shown a reduction in nitrogen dioxide concentrations since 2004 (Figures 1 & 2). All other stations have shown variable year-over-year concentrations changes between 2004 and 2014 (Figures 1, 2, & 3). Sherwood Park, Gold Bar, Lehigh Woodcroft, Ross Creek, Genesee, Meadows and Wagner2 monitoring stations have all observed modest reductions in nitrogen dioxide concentrations (Figures 1, 2, & 3). Lamont, Redwater, and Tomahawk monitoring stations have observed modest increases in nitrogen dioxide concentrations (Figures 2 & 3). Elk Island, Range Road 220, and Bruderheim monitoring stations observed no overall change in observed concentrations between 2004 and 2014 (Figure 2). 4

5 Figure 1: Annual average concentrations of Nitrogen Dioxide at monitoring stations within the boundary of the Alberta Capital Airshed. Figure 2: Annual average concentrations of Nitrogen Dioxide at monitoring stations operated by Fort Air Partnership. 5

6 Figure 3: Annual average concentrations of Nitrogen Dioxide at monitoring stations operated by West Central Airshed Society. NITROGEN DIOXIDE UPPER RANGE OF THE HOURLY DATA Level assignment Meadows and Bruderheim monitoring stations are assigned to Level 1, a decrease from the Level 2 assignment these stations received in the 2013 Assessment Summary Report. This change indicates that there were decreases in peak concentrations at these stations in Frequent changes in the levels assigned to the Meadows and Bruderheim monitoring stations, as observed since the 2011 Assessment Summary Report, may indicate that these stations are influenced by inter-annual variations in the conditions that result in peak concentrations. These changes may also be the result of the upper range of hourly data concentration at the Meadows and Bruderheim monitoring stations being measured near the absolute concentration of the Level 2 trigger value. All other stations remain assigned to the same levels as the 2013 Assessment Summary Report. Table 2 lists the results of the nitrogen dioxide upper range of the hourly data assessment and ambient air quality level assignment. 6

7 Table 2: Nitrogen Dioxide Upper Range of the Hourly Data Ambient Air Quality Level Assignment Edmonton Central Edmonton East Edmonton South Elk Island Fort Saskatchewan Genesee Lamont Meadows Range Road 220 Redwater Ross Creek Tomahawk Wagner Bruderheim Sherwood Park Gold Bar Lehigh Year Assessment Level Trends Observations from urban monitoring stations (Edmonton Central, Edmonton East, Edmonton South, Fort Saskatchewan) have shown a reductions in nitrogen dioxide concentrations since 2004 (Figures 4 & 5). However, these reductions have not been to the same degree as those observed for annual average concentrations, in addition to more variability being observed from year to year. All other stations have shown variable year-over-year concentrations changes between 2004 and 2014 (Figures 4, 5, & 6). Sherwood Park, Gold Bar, Lehigh Woodcroft, Elk Island, Ross Creek, Genesee, Meadows and Wagner2 monitoring stations have all observed overall modest reductions in nitrogen dioxide concentrations (Figures 4, 5, & 6). Lamont, Redwater, Range Road 220, Genesee, and Meadows monitoring stations have observed modest increases in nitrogen dioxide concentrations (Figures 5 & 6). Tomahawk monitoring station observed no overall change in observed concentrations between 2004 and 2014 (Figure 6). 7

8 Figure 4: Upper range concentrations of Nitrogen Dioxide at monitoring stations within the boundary of the Alberta Capital Airshed. Figure 5: Upper range concentrations of Nitrogen Dioxide at monitoring stations operated by Fort Air Partnership. 8

9 Figure 6: Upper range concentrations of Nitrogen Dioxide at monitoring stations operated by West Central Airshed Society. SULPHUR DIOXIDE ANNUAL AVERAGE Level Assignment For the 2014 assessment summary, Redwater monitoring station remains at Level 2. Redwater monitoring station is located within the boundaries of an industrial property in close proximity to point sources associated with production equipment. Due to its location, Redwater monitoring station is not representative of regional air quality. The Fort Air Partnership plans to conduct a station siting suitability assessment in 2016 to optimize the location of the station for the collection of representative regional air quality data. Scotford2 monitoring station was moved from its location in May 2014 due to pipeline right-of-way expansion at the location of the site. Therefore Scotford2 monitoring station did not meet the data completeness requirement for the 2014 assessment summary. Scotford Temporary monitoring station was established in May 2014, 5 km southeast of the Scotford2 monitoring station site. Scotford Temporary monitoring station did not meet the data completeness requirement for the 2014 assessment summary. Scotford Temporary monitoring station will remain indefinitely until a location for a permanent monitoring station can be located. All other stations remain assigned to Level 1. Table 3 lists the results of the sulphur dioxide annual assessment and ambient air quality level assignment. 9

10 Table 3: Sulphur Dioxide Annual Average Ambient Air Quality Level Assignment Edmonton East Edmonton South Elk Island Fort Saskatchewan Genesee Lamont Meadows Range Road 220 Redwater Ross Creek Scotford2 Tomahawk Wagner Bruderheim Sherwood Park Elmjay Gold Bar Beverly Lehigh Year Assessment Level Trends With the exception of Beverly monitoring station, all monitoring stations within the Capital Region observed no overall change, outside of year-to-year variability, in observed annual average concentrations between 2004 and 2014 (Figures 7, 8, & 9). Beverly station observed a decline in annual average sulphur dioxide concentrations between 2004 and 2014 (Figure 7). 10

11 Figure 7: Annual average concentrations of Sulphur Dioxide at monitoring stations within the boundary of the Alberta Capital Airshed. Figure 8: Annual average concentrations of Sulphur Dioxide at monitoring stations operated by Fort Air Partnership. 11

12 Figure 9: Annual average concentrations of Sulphur Dioxide at monitoring stations operated by West Central Airshed Society. SULPHUR DIOXIDE UPPER RANGE OF THE HOURLY DATA Level Assignment For the 2014 assessment summary, the Redwater monitoring station remains assigned to Level 4 and the Sherwood Park monitoring station remains assigned to Level 2. Redwater monitoring station is located within the boundaries of an industrial property in close proximity to point sources associated with production equipment. Due to its location, Redwater monitoring station is not representative of regional air quality. The Fort Air Partnership plans to conduct a station siting suitability assessment in 2016 to optimize the location of the station for the collection of representative regional air quality data. Sherwood Park station is located in close proximity downwind of several major industrial facilities with large point source emissions of sulphur dioxide. The assignment of the Redwater and Sherwood Park monitoring stations to levels higher than other stations in the Capital Region indicates that these stations are more affected by peak concentrations than other stations in the Capital Region. Scotford2 monitoring station was moved from its location in May 2014 due to pipeline right-of-way expansion at the location of the site. Therefore Scotford2 monitoring station did not meet the data completeness requirement for the 2014 assessment summary. Scotford Temporary monitoring station was established in May 2014, 5 km southeast of the Scotford2 monitoring station site. Scotford Temporary monitoring station did not meet the data completeness requirement for the 2014 assessment summary. Scotford Temporary monitoring station will remain indefinitely until a location for a permanent station can be located. 12

13 All other stations remain assigned to Level 1. Table 4 lists the results of the sulphur dioxide upper range of the hourly data assessment and ambient air quality level assignment. Table 4: Sulphur Dioxide Upper Range of the Hourly Data Ambient Air Quality Level Assignment Edmonton East Edmonton South Elk Island Fort Saskatchewan Genesee Lamont Meadows Range Road 220 Redwater Ross Creek Scotford2 Tomahawk Wagner Bruderheim Sherwood Park Elmjay Gold Bar Beverly Lehigh Year Assessment Level Trends Monitoring stations near industrial facilities (Edmonton East, Sherwood Park, Elmjay, Gold Bar, Beverly, Lamont, Range Road 220, Redwater, Ross Creek, Scotford 2, Genesee, Meadows, and Wagner 2) have shown variable year-over-year upper range concentrations changes between 2004 and 2014 (Figures 10, 11, & 12). Of these monitoring stations, Sherwood Park, Scotford 2 and Wagner 2 have observed modest increases, and Edmonton East, Elmjay and Range Road 220 did not change in concentration between 2004 and Gold Bar, Beverly, Lamont, Redwater, Ross Creek, Genesee and Meadows monitoring stations observed modest reductions in upper range sulphur dioxide concentrations between 2004 and

14 Monitoring stations away from industrial facilities (Edmonton South, Lehigh Woodcroft, Elk Island, Fort Saskatchewan, Bruderheim, and Tomahawk) with the exception of Elk Island (which did not change), observed small changes, outside of year-to-year variability, in observed upper range sulphur dioxide concentration between 2004 and Figure 10: Upper range concentrations of Sulphur Dioxide at monitoring stations within the boundary of the Alberta Capital Airshed. 14

15 Figure 11: Upper range concentrations of Sulphur Dioxide at monitoring stations operated by Fort Air Partnership. Figure 12: Upper range concentrations of Sulphur Dioxide at monitoring stations operated by West Central Airshed Society. 15

16 FINE PARTICULATE MATTER Note that in 2014, the fine particulate matter analyzers at all monitoring stations in the Capital Region, with the exception of the Genesee, Tomahawk, and Redwater monitoring stations were designated as Federal Equivalent Method (FEM) compliant. The FEM type analyzers more effectively account for the volatile components in measurements of fine particulate matter. This results in higher, but likely more representative measurements of fine particulate matter concentrations. In 2015 the Canadian Ambient Air Quality Standards (CAAQS) were implemented in Alberta, replacing the Canada-wide Standards. In Alberta the Canada-wide standards were implemented through the former Clean Air Strategic Alliance (CASA) Particulate Matter and Ozone Management Framework. The action triggers and action levels in the Capital Region Air Quality Management Framework are based on the former CASA Particulate Matter and Ozone Management Framework. The CAAQS adopt a similar four action level structure, however the action triggers (now thresholds) and ambient standards are more stringent. In addition to a 24- hour standard, the CAAQS also introduce a new annual average ambient standard. Further details regarding the implementation of the CAAQS and the differences from the Capital Region Air Quality Management Framework can be found in the following documents: Alberta Implementation of the Air Zone Management Framework for Fine Particulate Matter and Ozone 4 Red Deer Air Zone Fine Particulate Matter Response Government of Alberta Action Plan 5 FINE PARTICULATE MATTER 24-HOUR METRIC Level Assignment The first reporting of the CAAQS was in 2015 based on the period of Calculation of ambient metrics and determination of action level are similar for the CAAQS and the Capital Region Air Quality Management Framework. Assessed management levels, presented in this report for fine particulate matter, for the period of , are those assigned using the CAAQS and documented in the Alberta: Air Zones Report The following action levels for fine particulate matter in the Capital Region Air Quality Management Framework and management 4 Alberta Environment and Parks Alberta Implementation of the Air Zone Management Framework for Fine Particulate Matter and Ozone. pdf 5 Alberta Environment and Parks Red Deer Air Zone Fine Particulate Matter Response Government of Alberta Action Plan. 6 Alberta Environment and Parks Alberta: Air Zones Report management-frameworks/canadian-ambient-air-quality-standards-for-particulate-matter-and-ozone/documents/ AlbertaAirZonesReport Sep2015.pdf 16

17 levels for fine particulate matter under the CAAQS have similar management intent: Level 1 and Green; Level 2 and Yellow; Level 3 and Orange; Level 4 and Red. This comparison is not an official equivalency. The Alberta: Air Zones Report indicates that Edmonton Central, Edmonton East, Edmonton South, Fort Saskatchewan and Bruderheim monitoring stations exceeded the middle threshold value (as defined in the Guidance Document for Air Zone Management 7 ) and were therefore assessed to the orange management level. The orange management level involves management actions for preventing CAAQS exceedance. A Level 3 response in the Capital Region Air Quality Management Framework involves similar intent to take action on pressures and prevent reaching air quality limits. Assignment to the orange management level therefore represents a decrease in assigned management level as Edmonton Central monitoring station has gone from a Capital Region Air Quality Management Framework action level indicating exceedance of an ambient standard in to a CAAQS management level intended to prevent exceedance of an ambient standard in Assignment to the orange management level represents an increase in assigned management level as Fort Saskatchewan monitoring station has gone from a Capital Region Air Quality Management Framework action level intended to gather information regarding air quality conditions and pressures in to a CAAQS management level intended to prevent exceedance of an ambient standard in The Alberta: Air Zones Report indicates that Elk Island and Lamont monitoring stations exceeded the lowest threshold value (as defined in the Guidance Document for Air Zone Management) and were therefore assessed to the yellow management level. The yellow management level involves management actions for preventing air quality deterioration. A Level 2 response the Capital Region Air Quality Management Framework involves similar intent to understand pressures and conditions. Assignment to the yellow management level therefore represents a decrease in assigned management level as Lamont monitoring station has gone from a Capital Region Air Quality Management Framework action level intended to prevent exceedance of an ambient standard in to a CAAQS management level intended to prevent deterioration of air quality in Assignment to the yellow management level represents an increase in assigned management level as Elk Island monitoring station has gone from a Capital Region Air Quality Management Framework action level intended for baseline monitoring and reporting in to a CAAQS management level intended to prevent deterioration of air quality in The Alberta: Air Zones Report indicates that Genesee and Tomahawk monitoring stations were assigned to the green management level. The green management level is the lowest of the four management levels and involves 7 Canadian Council of Ministers of the Environment. (2012). Guidance Document on Air Zone Management. 17

18 management actions for keeping clean areas clean. This management intent is similar to the lowest of the four management levels in the Capital Region Air Quality Management Framework, Level 1 to which a management response comprising of monitoring and reporting is expected. Assignment to the green management level in this report is therefore consistent with the level assigned to these stations in the 2013 Assessment Summary Report. Redwater monitoring station was excluded from the assessment under the CAAQS. The rationale for this decision was based on the monitoring station s location very near to industrial activity. This rationale follows from Section 1.3 of the Alberta Implementation of the Air Zone Management Framework for Fine Particulate Matter and Ozone. Table 5 lists the results of the fine particulate matter assessment for the 24-hour metric and the ambient air quality management level assignment. Table 5: Fine Particulate Matter 24-hour Ambient Air Quality Level Assignment Edmonton Central Edmonton East Edmonton South Elk Island Fort Saskatchewan Genesee Lamont Redwater Tomahawk Bruderheim Year Capital Region Air Quality Management Framework Assessment Level CAAQS Assessment Level O O O Y O G Y G O R = Red, O = Orange, Y = Yellow, G = Green 18

19 Trends Reported concentrations of fine particulate matter against the CAAQS include all measured data to determine the 98 th percentile concentration. In cases where a CAAQS metric exceeds the standard, trans-boundary flows and exceptional events (e.g. forest fire smoke events) may be considered for removal before recalculation of the 98 th percentile concentration and verification of achievement of the metric. Concentrations reported in the Alberta: Air Zones Report do not account for removal of trans-boundary flows and exceptional events; however, the management level assignments do take into account trans-boundary flows and exceptional events. Concentrations reported in Figure 13 have been calculated to take into account any trans-boundary flows and exceptional events. Therefore, the concentrations in Figure 13 are consistent with the assessed management levels in Table 5. Adoption of FEM type analyzers has resulted in a step change in observed fine particulate matter concentrations at Edmonton Central, Edmonton East, Edmonton South and Fort Saskatchewan monitoring stations between and As outlined in the Capital Region Fine Particulate Matter Science Report 8 volatile species of fine particulate matter are in abundance in urban areas. The observed step change in concentrations measured at urban location is therefore consistent with the adoption of FEM analyzers at these locations. In general there is substantial variability in the 24-hour metric concentrations from year to year, potentially a result of the meteorologically dependent and episodic nature of secondary fine particulate matter formation in the Capital Region. 8 Alberta Environment and parks Capital Region Fine Particulate Matter Science Report. aep.alberta.ca/focus/cumulative-effects/capital-region-industrial-heartland/documents/capitalregion-pm- ScienceReport-Dec2014.pdf 19

20 20 Figure 13: 24-hour metric (3 year average of annual 98 th percentile concentrations) of fine particulate matter at monitoring stations in the Capital Region. Columns with diagonal striping are from the Alberta: Air Zones Report Triggers marked with dotted lines are from the former CASA Particulate Matter and Ozone Management Framework, adopted by the Capital Region Air Quality Management Framework. Thresholds marked with solid lines correspond to the CAAQS. All concentrations were determined after the removal of trans-boundary flows and exceptional events. Concentrations determined under the CASA Particulate Matter and Ozone Framework and the CAAQS may not be directly comparable due to differences in the removal of transboundary flows and exceptional events.

21 FINE PARTICULATE MATTER ANNUAL AVERAGE METRIC Level Assignment The first reporting of the CAAQS was in 2015 based on the period of Calculation of the annual average ambient metric and determination of action level follow a similar four level framework to the Capital Region Air Quality Management Framework; However, the annual average metric is not included in the Capital Region Air Quality Management Framework. The Alberta: Air Zones Report indicates that Edmonton Central, Edmonton East, Edmonton South, Lamont and Bruderheim monitoring stations exceeded the middle threshold value (as defined in the Guidance Document for Air Zone Management) and were therefore assessed to the orange management level. The orange management level involves management actions for preventing CAAQS exceedance. The Alberta: Air Zones Report indicates that Elk Island and Fort Saskatchewan monitoring stations exceeded the lowest threshold value (as defined in the Guidance Document for Air Zone Management) and were therefore assessed to the yellow management level. The yellow management level involves management actions for preventing air quality deterioration. The Alberta: Air Zones Report indicates that Genesee and Tomahawk monitoring stations were assigned to the green management level. The green management level is the lowest of the four management levels and involves management actions for keeping clean areas clean. Redwater monitoring station was excluded from the assessment under the CAAQS. The rationale for this decision was based on the monitoring station s location very near to industrial activity. This rationale follows from Section 1.3 of the Alberta Implementation of the Air Zone Management Framework for Fine Particulate Matter and Ozone. Figure 14 graphically depicts the fine particulate matter assessment for the annual average metric and the resultant ambient air quality management level assignment. Trends The Alberta: Air Zones Report represents the first reporting of the annual average metric in the Capital Region. Concentrations corresponding to the assessed management levels are documented in Figure 14. Spatially, urban monitoring stations observe the highest concentrations of fine particulate matter. 21

22 Figure 14: Annual average metric (3 year average of annual average concentrations) of fine particulate matter at monitoring stations in the Capital Region. All concentrations were determined after the removal of trans-boundary flows and exceptional events. OZONE In 2015 the Canadian Ambient Air Quality Standards (CAAQS) were implemented in Alberta, replacing the Canada-wide Standards. In Alberta the Canada-wide standards were implemented as the former Clean Air Strategic Alliance (CASA) Particulate Matter and Ozone Management Framework. The action triggers and action levels in the Capital Region Air Quality Management Framework are based on the former CASA Particulate Matter and Ozone Management Framework. The CAAQS adopt a similar four action level structure, however the action triggers (now 22

23 thresholds) and ambient standards are more stringent. Further details regarding the implementation of the CAAQS and the differences from the Capital Region Air Quality Management Framework can be found in the following document: Alberta Implementation of the Air Zone Management Framework for Fine Particulate Matter and Ozone Level Assignment The first reporting of the CAAQS is based on the period of Calculation of ambient metrics and determination of action level are similar for the CAAQS and the Capital Region Air Quality Management Framework. Assessed management levels, presented in this report for ozone, for the period of , are those assigned using the CAAQS and documented in the Alberta: Air Zones Report The following action levels for ozone in the Capital Region Air Quality Management Framework and management levels for ozone under the CAAQS have similar management intent: Level 1 and Green; Level 2 and Yellow; Level 3 and Orange; Level 4 and Red. This comparison is not an official equivalency. The Alberta: Air Zones Report indicates that Genesee, Lamont, and Bruderheim monitoring stations exceeded the middle threshold value (as defined in the Guidance Document for Air Zone Management) and were therefore assessed to the orange management level. The orange management level involves management actions for preventing CAAQS exceedance. A Level 3 response in the Capital Region Air Quality Management Framework involves similar intent to take action on pressures and prevent reaching air quality limits. Assignment to the orange management level represents an increase in assigned management level at all three monitoring stations, having gone from a Capital Region Air Quality Management Framework action level intended to gather information regarding air quality conditions and pressures in to a CAAQS management level intended to prevent exceedance of an ambient standard in Assignment of these stations to the orange management level was likely a result of the change in threshold from the 58 ppb planning trigger in the Capital Region Air Quality Management Framework to the 56 ppb middle threshold value of the CAAQS. Ozone concentrations were similar to those in the 2013 Assessment Summary Report and much lower than previous assessment summary reports (Figure 15). The Alberta: Air Zones Report indicates that all other monitoring stations were assigned to the yellow management level. The yellow management level involves management actions for preventing air quality deterioration. This management intent is similar to the Level 2 response to understand pressures and conditions in the Capital Region Air Quality Management Framework. Assignment to the yellow management level is therefore consistent with the level assigned to these stations in the 2013 Assessment Summary Report. 9 Alberta Environment and Parks Alberta: Air Zones Report management-frameworks/canadian-ambient-air-quality-standards-for-particulate-matter-and-ozone/documents/ AlbertaAirZonesReport Sep2015.pdf 23

24 Table 6 lists the results of the ozone assessment the ambient air quality management level assignment. Table 6: Ozone Ambient Air Quality Level Assignment Edmonton Central Edmonton East Edmonton South Elk Island Fort Saskatchewan Genesee Lamont Tomahawk Bruderheim Year Assessment Level CAAQS Assessment Level Y Y Y Y Y O O Y O R = Red, O = Orange, Y = Yellow, G = Green Trends Reporting of ozone concentrations against the CAAQS includes all observed data; as included in the Alberta: Air Zones Report In cases where a CAAQS metric exceeds the standard or threshold, trans-boundary flows and exceptional events (e.g. stratospheric intrusion of ozone) may be considered for removal before re-calculation of the 3-year-average of the annual 4 th highest of the daily maximum 8-hour average concentration metric for verification of achievement of the metric. Concentrations reported in Figure 15 have been calculated to take into account any trans-boundary flows and exceptional events. Therefore, the concentrations in Figure 15 are consistent with the assessed management levels in Table 6. Ozone concentrations at all monitoring stations in the Capital Region have observed a similar pattern from to with some variation. Many stations 24

25 observed a rise in ozone concentrations between and , to new maximum or near-maximum concentrations. However, in general, ozone concentrations have fallen over this period and are currently at or near their lowest observed concentrations. Figure 15: 8-hour metric (3-year-average of the annual 4 th highest of the daily maximum 8-hour average concentrations) of ozone at monitoring stations in the Capital Region. All concentrations were determined after the removal of trans-boundary flows and exceptional events. Concentrations determined under the CASA Particulate Matter and Ozone Framework and the CAAQS may not be directly comparable due to differences in the removal of transboundary flows and exceptional events. 25

26 For more information contact: Alberta Environment and Parks Information Centre Main Floor, Street Edmonton, AB T5K 2J6 Toll-free: Dial and the phone number Telephone: July 2016 ISBN (print) ISBN (PDF)