The wildfire smoke in our area has triggered an extreme air quality alert.  www.canada.ca/en/environment-climate-change/services/air-quality-health-index/wildfire-smoke.html

This pollution contains fine particles [not visible to the human eye] that get deep into our lungs and bloodstream. These can sometimes lead to serious health effects. The worst of it is likely today and tomorrow. There is a chance of some relief over the weekend. weather.gc.ca/city/pages/on-139_metric_e.html