Ottawa Air Quality

Understanding the AQHI Scale

The Air Quality Health Index (AQHI) measures health risks from local air pollution on a scale from 1 to 10+, with higher numbers indicating greater health risk.

Low (1–3) Air quality is good. Enjoy your usual outdoor activities.
Moderate (4–6) Some risk for sensitive groups. Limit prolonged outdoor exertion.
High (7–10) Increased risk. Reduce outdoor activities, especially if you have respiratory issues.
Very High (10+) Serious risk. Avoid outdoor activities and follow health advisories.

Ottawa Air Quality by Station

Ottawa

AQHI 1.69

Last updated: 9:00 AM EDT Monday 11 May 2026

How Air Quality Affects Your Health

Air pollution can aggravate respiratory conditions such as asthma and chronic bronchitis, and it may impact cardiovascular health. By monitoring AQHI levels, you can reduce exposure to harmful pollutants by adjusting outdoor activities accordingly.

Tips to Protect Yourself on Poor Air Quality Days

Limit outdoor exercise and heavy exertion.
Keep windows and doors closed.
Use air purifiers indoors if possible.
Stay hydrated and maintain good respiratory hygiene.

About Ottawa Air Quality

Ottawa air quality is monitored closely to help residents stay informed about pollution levels and associated health risks. The Air Quality Health Index (AQHI) is a trusted metric that summarizes complex pollution data into an easy-to-understand number, reflecting how clean or polluted the air is at any given time.

Understanding Ottawa's air quality is essential for everyone, especially sensitive groups such as children, seniors, and those with respiratory or cardiovascular conditions. Learn more about air quality standards at the Health Canada Air Quality page.

What Affects Ottawa Air Quality?

Several factors influence the air quality in Ottawa, including:

Vehicle emissions: Traffic congestion and emissions from cars and trucks contribute significantly to air pollution.
Industrial activities: Factories and power plants release pollutants that can degrade air quality.
Weather conditions: Wind, temperature, and humidity can disperse or trap pollutants near the ground.
Natural sources: Wildfires, pollen, and dust also impact Ottawa's air quality from time to time.

How is Ottawa Air Quality Data Captured?

The air quality data for Ottawa is collected through a network of monitoring stations spread across the city. These stations measure concentrations of key pollutants such as ozone, nitrogen dioxide, and particulate matter in real time.

The data is aggregated and analyzed by Environment Canada, which then calculates the Air Quality Health Index (AQHI) to provide a clear, health-focused overview of current air quality conditions. This information is publicly available and regularly updated to keep Ottawa residents aware and prepared.

Frequently Asked Questions (FAQs) about Ottawa Air Quality

What is the Air Quality Health Index (AQHI)?

The AQHI is a scale from 1 to 10+ that represents the health risk associated with local air pollution levels. It helps people understand how air pollution might affect their health and what precautions to take. Read more at the Government of Canada AQHI page.

Why is Ottawa's air quality important?

Maintaining good air quality in Ottawa is crucial for public health, environmental protection, and overall quality of life. Poor air quality can increase risks of respiratory and cardiovascular diseases.

How often is Ottawa air quality data updated?

The AQHI data for Ottawa is updated hourly to provide the most current air quality information to residents.

Can I use this data to plan my outdoor activities?

Yes! By checking the Ottawa air quality and AQHI levels, you can decide when it's safer to exercise or spend time outdoors, especially if you are sensitive to air pollution.

Where can I find official air quality forecasts for Ottawa?

Official air quality forecasts are published by Environment Canada and can be accessed via their website. Forecasts help anticipate changes in air quality over the coming hours or days.