Environmental Commissioner Gord Miller recently released an
Annual Report that offered up a frank assessment of where we're at. Apparently we aren't getting nearly enough smog days.
Miller writes:
In Ontario, air pollution is a public health crisis, with thousands of premature deaths attributed to air pollution each year. To help the public reduce or modify their exposure to poor air quality, the Ministry of the Environment (MOE) monitors and provides regular updates on regional ambient air quality through its on-line Air Quality Index (AQI) (see
www.airqualityontario.com). MOE’s 40 monitoring stations measure six key air pollutants known to be harmful to human health, including ground-level ozone and fine particulate matter (PM2.5).
Unfortunately, Ontarians who rely on the government’s AQI may be lulled into a false sense of security about the quality of the air they breathe. MOE’s monitoring stations are intentionally located away from local sources of pollutants in order to provide representative information about regional average exposure to air pollutants; while MOE’s data is useful for predicting air quality on a regional scale, it does not provide information about local – “street-level” – air quality at any given location. Current reporting of air quality by MOE based on the AQI may lead Ontarians to believe that air quality on the streets is better than it actually is.
To illustrate this concern, in the summer of 2007 the ECO asked air quality experts to monitor the air quality at street-level at a variety of locations across Ontario. The results revealed that levels of particulate matter were consistently higher at street-level sampling locations than at MOE’s equivalent AQI monitoring stations. For example, while street-level samples collected in downtown Toronto recorded concentrations of particulate matter equivalent to the AQI’s “very poor” category, MOE’s Toronto downtown AQI station reported air quality to be “good” at that time.