What is the AQHI (Air Quality Health Index)?

The AQHI is a scale from 1 to 10+ developed by Environment Canada that measures air quality in relation to human health. It combines readings of ozone, particulate matter (PM2.5), and nitrogen dioxide into a single number. 1-3 is Low Risk, 4-6 is Moderate Risk, 7-10 is High Risk, and above 10 is Very High Risk.

What is the current air quality in Ottawa?

The current AQHI for Ottawa is updated hourly by Environment Canada. Visit this page for the latest reading and health advice. Ottawa typically has good air quality (AQHI 1-3) but can spike during wildfire smoke events in summer.

When is Ottawa air quality worst?

Ottawa's air quality is generally good but can deteriorate significantly during wildfire smoke events, typically from June to September. The 2023 wildfire season was particularly impactful, with AQHI readings reaching 10+ on multiple days. Hot, humid summer days with little wind can also lead to elevated smog levels.

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Ottawa Air Quality

Real-time Air Quality Health Index (AQHI) for Ottawa. Updated hourly by Environment Canada.

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About the AQHI

The Air Quality Health Index (AQHI) is a scale from 1 to 10+ designed by Environment and Climate Change Canada to help you understand what the air quality around you means for your health. It measures the combined health risk from three pollutants: ground-level ozone (O₃), fine particulate matter (PM2.5), and nitrogen dioxide (NO₂). Unlike traditional air quality indices that focus on pollution levels, the AQHI is specifically calibrated to reflect the health impact of air pollution.

Ottawa Air Quality

About the AQHI

Understanding the Scale

When air quality is poor, head indoors

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