Air Quality in Sudbury


Frequently Asked Questions (4)

Why don’t you summarize carbon dioxide (CO2) concentrations?

Carbon dioxide (CO2) is a greenhouse gas that contributes to climate change. It is important to note that CO2 is not measured in air quality monitoring networks across Canada, including the air quality monitoring station in Sudbury.  So this is not unique to Sudbury. CO2 is measured in special air climate change studies undertaken by federal programs.

Is our air quality really that good? I am amazed at statements about our air quality and viewing sites like the that report air quality as good when I can smell and taste the sulphur dioxide in the air in and around my home.

While significant improvements have been realized in the past, the latest results show continued improvements from 1998 to 2007, the years covered in the report. During the 1970s, 1980s and up to the early 1990s, there were up to 50 to 60 hours per year when concentrations of sulphur gases from the smelters were measured above the Ministry of the Environment, Conservation and Parks’ 1 hour criterion. Since then, the measurements show that these events occur less than 7 times per year. So there are still times when sulphur gas from the smelters reaches ground level in the community, especially during the summer months. When this occurs, people can smell and taste the sulphur gases as you noted. However the results for the period 1998 to 2007 show that this happens less frequently and the levels are not as high as in the past. The station that reports the air quality for Sudbury for the Weather Network is located on Ramsey Lake Road.

Where are the air monitoring stations located in Greater Sudbury?

This map shows the station locations. There are 17 fixed sulphur dioxide monitoring stations located throughout the city.  [image of map]

Are there any comparative data for distant sites in NE Ontario that would be of use in studies of cancer? Is monitoring done in these areas? Are these data accessible?

The Ministry of the Environment runs provincial air quality index stations in four northern Ontario cities: North Bay, Sault Ste. Marie, Thunder Bay (and Sudbury).  The information from these stations was used in our report to compare Sudbury’s air quality. All data collected from Ministry of the Environment air monitoring stations throughout the province can be obtained from their website at:


Vale and Glencore Sudbury INO both prioritize air quality and would like to keep the public informed about what to do in an emergency situation, if an alert is sounded. These events occur very rarely and the risk to the public is extremely low. Keep yourself up to date on the latest safety tips to ensure that you know what to do in the event of an air quality emergency. Click on the following links to be redirected to air quality emergency preparedness tips from local authorities.

City of Greater Sudbury

Sudbury and District Health Unit

Glencore Sudbury INO