httpwwwohcowoncaairassesshtml Todd Irick MSc CIH Occupational Hygienist How common are IAQ problems IAQ starts with symptoms Increased prevalence of nonspecific common symptoms ID: 1014232
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1. AirAssessA Smartphone App to help workers identify & resolve Indoor Air Quality (IAQ) issueshttp://www.ohcow.on.ca/airassess.htmlTodd Irick, M.Sc., CIH Occupational Hygienist
2. How common are IAQ problems?
3. IAQ starts with symptoms:Increased prevalence of non-specific, common symptoms:headachefatigueirritated eyes, nose, throat and/or skinsymptoms clear when away from buildingcommonly called “Sick Building Syndrome” (SBS) but more accurately referred to as “building related non-specific symptoms” (BRS) or specifically (e.g. mucous membrane irritation)
4. HOW I FEEL AT WORKIN MY BUILDINGTHERMAL COMFORT(temp, RH, temp fluctuations)2. VENTILATION(outdoor air intake, air movement)CHEMICAL CONTAMINANTS(from inside or outside)4. BIOLOGICAL CONTAMINANTS (allergens)5. ERGONOMIC FACTORS(lighting, noise,workstation design)6. WORKPLACE STRESS(job content, pace, control, support)7. PERSONAL FACTORS(age, sex, allergies, smoking)
5. How do you measure this?
6. Standards and GuidelinesASHRAE 62.1-2016 “Ventilation for Acceptable Indoor Air Quality” states:3. ”acceptable indoor air quality: air in which there are no known contaminants at harmful concentrations as determined by cognizant authorities and with which a substantial majority (80% or more) of the people exposed do not express dissatisfaction.”ASHRAE Standard 55-2013 “Thermal Environmental Conditions for Human Occupancy” states:3. “environment, acceptable thermal: a thermal environment that a substantial majority (more than 80%) of the occupants find thermally acceptable.”
7. HEALTH CANADA: Indoor Air Quality in Office Buildings: A Technical Guide ASHRAE (Temperature, Relative Humidity, Carbon Dioxide)summer: 24-27oC (@50% RH)winter: 21-25oC (@30% RH)CO2 no more than 700 ppm above outdoor (typically ~400 ppm)ContaminantsCarbon Monoxide (CO): 5 ppmFormaldehyde: 0.1 ppmParticulate (less than 10 microns – PM10): 50 ug/m3 annual averageVolatile Organic Compounds (VOCs): target 1 mg/m3 = 1000 ug/m3(approximately 0.4 ppm = 400 ppb)
8. WELL UNDERSTOOD PARTIALLY UNDERSTOOD LITTLE UNDERSTOOD Types of Air Quality Factors, Contaminants & ToxinsVENTILATION, TEMPERATURE, HUMIDITYCOMBUSTION POLLUTANTSCO CO2 NOx solvents cleaning agents infectious agentsAsbestos, Pesticides, Lead Dust etc. Tobacco SmokeRADONVOLATILE ORGANIC COMPOUNDS (VOC’s)PAH’s, Aldehydes, Ethers, etc. Course Fine Ultra-fine ORGANIC DUSTAllergensMycotoxins Glucans EndotoxinsOZONEHeavy MetalsDioxinshttp://esc.syrres.com/sraupstateny/downloads/symposium%20presentations/vasselli.ppt
9. Here’s how it works:
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21. The future …Real-time, intelligent ventilation systems linked to occupants via an appKonis & Zhang, “Occupant-Aware Energy Management - Simulated Energy Savings Achievable Through Application of Temperature Setpoints Learned Through End-User Feedback”, ASHRAE and IBPSA-USA SimBuild 2016: Building Performance Modeling Conference, Salt Lake City, UT, 2016
22. Preventing Noise-Induced Hearing LossSay what?!?
23. … just to be clear about what we’re trying to prevent …normal hearing cellsdamaged hearing cells
24. What do we already know?3 little bones in the earnoise causes hearing loss we have noisy workstationshearing protection is available … but …we can reduce the noise (… pretty expensive, though, isn’t it?)as we age our hearing deteriorates
25. stats“last five years, the annual costs for noise induced hearing loss claims for all sectors in Ontario exceeded $50 million per year,” (MOL 2014)the WSIB showed a steady increase in NIHL registered claims from 3653 claims in 2005 to 5416 claims in 2009 (WSIB, 2011)Masterson et al. (2013) found 18% of 1,122,722 worker audiograms collected from the NIOSH OHL Surveillance Project met the NIOSH criteria for NIHLStekelenburg (1982) noted that: “… even if 80 dBA is taken as a time weighted average limit … 10% of the exposed population will not be protected against impaired social hearing caused by noise.” (page 408)
26. “Over a 45-year working life, 16% of construction workers developed COPD,11% developed parenchymal radiological abnormality, and 73.8% developed hearing loss.”
27. http://ehp.niehs.nih.gov/1307272/ Vocal Cord Nodules - teachers
28. What’s the most common used solution to noise concerns?
29. effectiveness of hearing protectorswww.cdc.gov/niosh/docs/96-110/personal.html
30. effectiveness of hearing protectors13 dB
31. Whatever way you look at it, this is not the permanent solution!… nor even a very effective temporary one.
32. Preventing noisepurchasing policy (new machinery <75 dBA)vibration control (isolators, damping)quiet materials for conveyors, bins (noiseless steel, plastic coatings, etc.)silencers, mufflers, specially designed compressed air nozzlesbalancing rotating parts, avoiding harmonic frequencies, etc.avoiding impacts in process flow (slide instead of drop)enclosures, barriers, curtainssound absorbing acoustic wall/ceiling treatmentincreasing distance from source
33. Prevention Opportunitiessource > path > exposure > target > diseasecheck on effectivenessof controlstoo late!!BestGoodTemporary
34. Motivations:business case (can we save $ doing it?)due diligence (compliance/liability)WSIB claimsawarenessInternal Responsibility System (IRS)personal experience of NIHL (self, family, co-worker)
35. The business case for preventing occupational disease:“Industrial safety is profitable only when direct and indirect costs associated with accidents exceed the cost of eliminating those accidents, and, … … by the same token, management has even less of an incentive to moderate the negative health effects flowing from a workplace as very few of the costs associated with industrial illness are absorbed by the industry that produces them.”Robert Sass, “Alternative Policies in the Administration of Occupational Health and Safety Programs” Economic and Industrial Democracy 8:243-257 (1987)
36. LegislationJuly 1, 2016 O.Reg. 381/15 finally extended the noise requirements to all workers in OntarioThe first efforts to do this began in 1979However, we know that some workers will still loose their hearing at between 80-85 dBA Lex,8 (≈10%)http://www.ohcow.on.ca/news/submission-to-the-ministry-of-labour-on-noise-proposals.html
37. Noise Legislation: O.Reg. 381/15employers take all measures reasonably necessary in the circumstances to protect workers from exposure to hazardous sound levels.protective measures against noise exposure include engineering controls, work practices and personal protective equipment. assessment of noise levels in the shall be done without regard to any use of personal protective equipment. every employer shall ensure that no worker is exposed to a sound level greater than an equivalent sound exposure level of 85 dBA, Lex,8.
38. solution: on-line calculator …http://www.ohcow.on.ca/edit/files/general_handouts/noisecalculator.xls
39. Noise Legislation: O.Reg. 381/15 (continued)the employer shall protect workers from exposure to a sound level greater than 85 dBA, Lex,8 without requiring the use of personal protective equipment. personal protective equipment is only to be used if engineering controls,do not existence or are not obtainable;are not reasonable or not practical to adopt, install or provide because of the duration or frequency of the exposures or because of the nature of the process, operation or work;are rendered ineffective because of a temporary breakdown of such controls; orare ineffective to prevent, control or limit exposure because of an emergency.
40. if engineering controls can’t be used then workers shall wear and use personal protective equipment appropriate in the circumstances to protect them from exposure to a sound level greater than 85 dBA, Lex,8a clearly visible warning sign shall be posted at every approach to an area in the workplace where the sound level regularly exceeds 85 dBA. “An employer who provides a worker with a hearing protection device shall also provide adequate training and instruction to the worker in the care and use of the device, including its limitations, proper fitting, inspection and maintenance and, if applicable, the cleaning and disinfection of the device.”Noise Legislation: O.Reg. 381/15 (continued)
41. Compliance?What percentage of workplaces with noise exposures over an Lex,8 of 85 dBA are currently in full compliance with O.Reg. 381/15? 90% 75% 50% 25% 10% 1% nonemy guess ….
42. Which activities is most effective?“In 2005, the Swedish Work Environment Authority inspected 1,721 workplaces in two days. To evaluate the effectiveness of the campaign, a web-based questionnaire was sent to inspected workplaces.The same questionnaire was sent to matched controls, i.e. workplaces that were not inspected but otherwise resembled, as far as possible, those that were inspected.On average, inspected workplaces had implemented 2.5 types of action against noise after the campaign, whereas the controls had implemented only 0.8.83%of the inspected workplaces reported that the activities of the Authority were the reason for the actions they had taken against noise. The study shows that the inspection campaign was highly successful in getting organisations to introduce noise prevention measures.”Policy and Practice in Health and Safety06.1 2008 p.55-63.
43. Who can measure?
44. anyone can measure noise …NIOSH has reviewed various noise measurement apps and found that some do a reasonable job of measuring sound (and some not so reasonable)e.g. SPLnFFT (US$5.49)https://itunes.apple.com/ca/app/splnfft-noise-meter/id355396114?mt=8 http://www.cdc.gov/niosh/surveyreports/pdfs/349-12a.pdf https://www.youtube.com/watch?v=jGVN7m3Wd1M
45. app to measure reverberationRevMeter Pro – an app to estimate the reverberation time in a room (≈ $7)ANSI S12.60-2002. Acoustical Performance Criteria, Design Requirements, and Guidelines for Schools“Unoccupied classroom levels must not exceed 35 dBAThe signal-to-noise ratio should be at least +15 dB Unoccupied classroom reverberation must not surpass 0.6 seconds in smaller classrooms or 0.7 seconds in larger rooms”https://itunes.apple.com/ca/app/revmeter-pro/id357421594?mt=8 http://www.asha.org/public/hearing/American-National-Standard-on-Classroom-Acoustics/
46. Online Audiometric test:http://hearingtest.online
47. Crowd-source dB(A) levels:pick a date: how about International Noise Awareness Day (last Wednesday in April (April 26, 2017))make it known (social media?)coordinate data collection; e-mail your results to: supervisor, H&S rep, union, OHCOW, MOL?create a form to accompany measurements:location, job, firm, noise sources, number of workers exposed, time exposedlevels over 85 dBA (what about 80 dBA?)is the a sign up?type of hearing protection? how often used? training?have engineering controls been considered (provide list)?audiometric testing?
48. … lot’s to do!