: Hourly Fine Particulate Matter PM2.5 Concentrations
From February 19, 2017 EST to February 21, 2017 EST.
- Effective January 1, 2013, the PM2.5 monitoring method was changed in Ontario. For more information, visit Frequently Asked Questions.
- The pollutant concentrations on this web page are based on automatically polled data and have not undergone final verification.
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