TTC update on subway air quality
April 27, 2017
Yesterday, the Ontario Ministry of Labour ruled the air in the subway was "not likely to endanger" after investigating three work refusals by TTC subway operators and one maintenance employee who felt they should be permitted to wear masks while working in the subway system.
The Ministry's ruling confirmed that the TTC met all of its legal and due diligence obligations and that the conditions within the subway didn't warrant employees wearing masks. In other words, the air quality in the subway system is safe and personal protective equipment related to air quality is not required.
The work refusals followed the publication earlier this week of a study by Health Canada on TTC air quality in a scientific, peer-reviewed academic journal. The study was conducted to compare dust exposures between major transit properties in Canada to help guide transportation planners to improve air quality for commuters. The purpose was to gather information about dust levels, not to draw conclusions about the impact of the dust levels on health. The study confirmed previous internal assessments that found that the dust is primarily iron from steel wheels and rails, and that it is dustier in an enclosed subway tunnel than outside.
TTC CEO Andy Byford said, "It's most regrettable that a comparison to the air quality on the TTC was, in certain media articles, made to that of Beijing, one of the planet's most polluted cities. Doing so, frankly, has caused harm to the TTC's reputation and unnecessary alarm for some TTC employees. The TTC had already committed to its own air quality assessment and will begin that study later this year."
Today, Health Canada wrote to the TTC to reiterate that the results of the study were never designed as a statement of health impacts of air quality in the subway system. The letter, in part reads:
"While the results of this study have been compared to average air quality in Beijing, it is important to note that this comparison can be misinterpreted when simplified. Air quality in Beijing is often at levels much higher than that observed in Toronto subways during peak transit hours. Peak levels of air pollutants (particulate matter) in Beijing are often up to 8 times higher than the levels measured in the Toronto subway, and can last over periods of several days.
"In addition, there have been numerous studies of air quality in subway systems internationally, including those in London, New York, and Stockholm, and the results from Toronto are consistent with levels observed elsewhere."
Since the study was conducted in 2011, the introduction of new subway trains and refurbishment of HVAC systems on older subway trains have helped mitigate and reduce particulate matter on trains. Other measures the TTC has undertaken include the creation in 2014 of a special cleaning crew to remove thick debris buildup on tunnel walls that will reduce airborne dust and particulates, and a new vacuum car with a HEPA filter - a gold standard for air filtration - arriving on TTC property later this year. Combined, these measures are further evidence of the TTC's commitment to a healthy and safe public transit system.
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