1 Indoor Air Quality & Mold Class Spring 2012 Building Monitors Meeting Presentation Agenda IAQ - indoor ventilation Air contaminants Molds Requirements for growth Health effects Mold prevention - moisture EH&S mold checks & removal Summary Recommendations D id Sh A Di E i l H l h & S f David Shearer, Asst Director, Environmental Health & Safety
2 Modern ventilation & IAQ / Classroom type environment (most IAQ problems) Most ventilation is forced-air type Ventilation is general dilution type Heating, Ventilating, and Air Conditioning (HVAC) System Windows (older buildings) IAQ & Mold, NMSU EH&S
3 Energy Efficiency Starting in the 1970 s buildings were sealed to reduce energy costs Air contaminants trapped Lack of outdoor air Tightly sealed = poor air quality American Society of Heating, Refrigeration & Air-Conditioning Engineers (ASHRAE) Standard d 15 to 20 Cubic Feet per Minute (CFM) outdoor air per person IAQ & Mold, Environmental Health & Safety
4 Ventilation in Campus Buildings Chemistry Building 1950, 1965, 1995 s 100% outdoor make up air No indoor air is re-circulated Hdl Hadley Hll Hall Primarily fan coil heating & cooling, window air dilution, minor forced air Thomas & Brown Min. 10% outside air Depending on in & outdoor temp. up to 40% can be make-up air Min. 10%
5 Causes of IAQ Problems Temperature and/or Humidity Inadequate fresh air - Leads to Carbon Dioxide (CO 2 ) buildup (examples: UTEP Union remodel; also O Donnel Hall specific rooms/dampers) ) CO 2 Outdoor CO 2 levels ~350 ppm Indoor CO 2 Levels ppm >1000 ppm CO 2 >> tired/sleepiness Typical building limit for CO 2 is 5000 ppm
6 Other Causes of IAQ Problems Chemicals & Contaminants in buildings Building Remodeling - Adhesives, Paints EH&S policy limits chemicals use in general office/classroom buildings. special ventilation or schedule work on weekends or after hours. Poss. need to relocate employees (Dove Hall fire cleanup) Cleaners (Branson Library example) Personal Hygiene Products Perfumes, Deodorants, Cologne
7 Other Causes of IAQ Problems Chemicals & Contaminants Air Cleaners - some generate ozone Affect existing respiratory problems Printers/Copying Machines Particulates & ozone eye & lung irritations Printer study: Ozone <0.001 ppm to ppm Problematic w/poor ventilation (ex. Breland) Water Leaks/Water Damage Mold or Mildew (recent concerns / news)
8 What is mold? Molds are fungi with multi-celluar filaments called hyphae. Reproduce through spores. Airborne dispersal. Cling to clothing. Survive temp. extremes.
9 Mold & Mold Spore Exposure Mold & fungi - found virtually everywhere, over 1.5 million fungi species (~72 72,000 described) Mold spores are extremely small & become airborne. Daily exposed to mold spores in air. Particle Size(microns) Beach Sand Dust Mites Human Hair Saw Dust Pollens Mold Spores Red Blood Cells 5-10 Exposure occurs by Exposure occurs by breathing, ingestion, & skin contact.
10 Requirements for Mold Growth 1. Moisture and/or high relative humidity y( (>60%) 2. Temperature above 40 below 100 FF 3. Organic matter (ceiling tile, wall board, paper, soiled carpet, etc) 4. Source of spores Moisture: a key factor for most mold
11 Health Effects with Mold Exposure Allergic reaction is most common mold effect. Commonly confused with pollen & dust allergies Can cause a variety of health risks dependent on type & amount of mold, and susceptibility & sensitivity of person. Many will have no reaction to mold exposure. Those with health conditions are Those with health conditions are more sensitive to mold exposure.
12 Who is most affected by mold? People affected sooner & more severely : Babies and children Elderly persons Those with chronic respiratory conditions, extreme allergies Asthma Weakened immune systems (people with HIV, AIDS, receiving chemotherapy, or organ transplant t recipients) i
13 Few molds are worst than others. Mycotoxins produced by some "toxic molds historical problem to farmers & animal husbandry in eastern Europe countries. harmful when inhaled, ingested or contact human skin. Rare illness. General practice for indoor molds to be treated the same, to be is removed promptly, no matter what mold types
14 Primary molds of concern (Mycotoxin Mycotoxin) Aspergillus Penicillium (some strains) very common in air & dust indoors (even at low humidity). -if higher levels indoors, likely water intrusion Chaetomium (poss. mycotoxin) both outside & indoors. Indoors on wet sheetrock & other materials Fusarium (poss. mycotoxin) needs very wet conditions Stachybotrys (some strains may produce mycotoxins) Not an uncommon mold. Very slick, high water needs.
15 EH&S IAQ/Mold Investigation Detective, Scientist & Public Relations Many hats = Environmental Health & Safety Professional
16 NMSU Examples
17 Ceiling leak example 2010 Ceiling tile, Not just stains, but dark discoloration. Generally indicate continued wet conditions. Ideal for mold. EH&S wasn t notified in 2010.
18 Ceiling leak example cont d 2012 Ceiling tile replaced in 2010 but new staining & discoloration. EH&S checked, met with occupants, & arranged detailed Investigation with FS shops
19 Ceiling leak cont d 2012 EH&S identified multiple sources as - un-insulated AC components (primary problem), - some from leaky windows & - some from roof & 3 rd floor drains Water dripping from un-insulated pipes
20 Window leak example June 2011 Upon initial check, EH&S found bubbling & peeling of vinyl wallpaper under windows. (photo shows general room view)
21 Window leak example cont d June 2011 EH&S noted no mold on wall surface but reported often damp. - Further peeling noted much staining and mold under vinyl wallpaper. (photo shows mold under wall cover)
22 Window leak example cont d June 2011 EH&S determined d cause - to be leaky windows insulation allowing water to seep under vinyl wall cover (photo show missing seal)
23 Window leak example cont d June 2011 EH&S found moldy wall caused by leaky windows insulation - remediated/removed dry wall and resealed windows (photo showing uncover wall cavity)
24 Air sampling example - Spring Performed because leaky roof & expressed concerns - Total mold concentrations showed most inside molds concentrations lower than outside samples Hall Entry Plenum Exterior Exterior
25 Air sampling example - Spring Performed because leaky roof & expressed concerns - Review of mold types showed few of concern & at lower concentration compared to exterior Exterior1 Exterior2
26 Air sampling example - Spring Performed because of expressed concerns - Showed inside Cladosporium concentration lower than outside Hall Entry Plenum Exterior Exterior
27 Air sampling example - Spring Performed because leaky roof & expressed concerns - Showed inside molds conc. lower inside than outside Hall Plenum Exterior
28 Mold Prevention and Water Clean-Up Mold needs moisture and food source to grow. Keys to mold & fungus prevention: removing moisture and clean-up within hours. When any source of moisture is found, report it to Facilities Services to get the area dried ASAP.
29 Mold Prevention and Water Clean-Up Facilities Services & Other Maintenance Personnel Must locate the source of the moisture and eliminate i the causative agent and; Utilize prevention techniques to minimize the potential for mold and fungal growth. Water source is not known EH&S can investigate.
30 Mold Prevention What do you do? Example Scenario A flood soaked the carpet in one of the ground floor rooms in a building on campus. What do you do?
31 Answer Mold Prevention What do you do? DRY WITHIN 24 HOURS Remove all material from the carpet. FS to remove the water with a water extraction vacuum. If extensive, arrange to shampoo the carpet Reduce humidity with dehumidifiers and y use fans to accelerate the drying process.
32 EH&S Mold Assessment As appropriate EH&S will conduct a mold hazard assessment. Visual Inspection The presence of mold, water damage, or musty odors must be addressed immediately, beginning with a visual inspection. Visually checked for damp filters and other damp conditions. Ceiling tiles, walls, cardboard and paper must also be visually inspected for mold growth. Check wall board moisture with meter, possible internal inspection
33 EH&S Mold Assessment Sampling Air monitoring is seldom needed or indicative if mold is found. Air sampling & analysis is complicated. Mostly to check inside air mold concentrations & to check against mold spores in outdoor air. If air monitoring is performed, outdoor air and non-suspect area samples must also be collected for comparative purposes.
34 Clean-Up and Removal Four levels of contamination Level 1: Small Isolated Areas (10 ft 2 or less) Level 2: Mid-Sized Areas (10 ft ft 2 ) Level 3: Large Areas (More than 100 ft 2 ) Level 4: HVAC Contamination
35 Clean-up and Removal Level 2: Mid-Sized Areas (10 ft ft 2 ) Level 3: Large Areas (More than 100 ft 2 ) Level 4: HVAC Contamination Outside contractors to perform remediation. 1. For I&G areas, EH&S will arrange if needed. d 2. Other areas, EH&S will recommend. 3. EH&S is to be consulted prior to any remediation.
36 Summary IAQ - indoor ventilation Indoor air contaminants Molds Requirements for mold growth Health effects associated with mold Mold prevention - moisture EH&S Mold checks & removal Questions: call or David Shearer, Assistant Director NMSU Environmental Health & Safety s
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