What is the air quality in Markham?

Markham, Canada has an annual US AQI of 48 (Reasonable) and average PM2.5 of 9.4 µg/m³, ranking #624 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Markham?

October is typically the cleanest month (AQI 41) and July the most polluted (AQI 56).

PM2.5: 1998–2024 (satellite). From satellite data, because no government monitor covers the city. Full sources are on the methodology page.

Global rank	City	Continent	AQI	PM2.5
624	Markham, Canada	North America	AQI 48	PM2.5 9.4 µg/m³