Guelph: Hourly Fine Particulate Matter PM2.5 Concentrations
From January 13, 2025 EST to January 15, 2025 EST.
Notes:
- 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.
