AQHI vs AQI: Canada and US Air Quality Scales Compared
Canada reports air quality on the AQHI, a 1-10+ health index built from three pollutants; the US reports the 0-500 AQI keyed to the worst single pollutant. There is no exact conversion, but wildfire smoke drives both with PM2.5, so the bands line up in practice. This guide maps the scales, decodes the bands, and sets N95 thresholds.
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