Canada Live Air Quality Index AQI Map Now & Today

A live air quality map for Canada shows current readings from government monitoring stations, refreshed through the day. Environment and Climate Change Canada publishes the Air Quality Health Index for most communities. Commercial platforms often convert the same station data to the American scale. Both describe the same air, but the action thresholds differ.

TL;DR

Canada’s official public number is the Air Quality Health Index, a 1 to 10+ health risk scale. Most consumer maps show a converted United States value running 0 to 500 instead. Confirm which scale produced your number, then act on that scale’s threshold. For a nationwide view, use the Filterbuy live air quality index Canada map linked in Essential Resources below.

Top Takeaways

• Canada reports the Air Quality Health Index, a 1 to 10+ scale blending ozone, nitrogen dioxide, and fine particulate into one health risk score.
• The United States index runs 0 to 500 and reports the single worst pollutant. The two do not convert.
• During wildfire smoke, the index is recalculated hourly on fine particulates alone. British Columbia and Alberta label that version AQHI+.
• Once a reading climbs, indoor steps matter most. Shut the house, filter what is circulating, protect one room.

What a Live AQI Map for Canada Actually Shows

A Canada AQI map plots hourly readings from regulatory monitoring stations onto a colour coded map. Each dot is a real instrument, not an estimate for your street. Environment and Climate Change Canada runs the national feed with provincial, territorial, municipal, and health agency partners.

Community values average several nearby stations, which is why your street can differ from the number on screen. Coverage is uneven too, and that matters when the real time air quality Canada map puts the nearest dot 200 kilometres away.

AQHI or AQI, Which Number Is on Your Screen

The Canadian Air Quality Health Index runs 1 to 10+ and estimates combined short term health risk from ozone, nitrogen dioxide, and fine particulate. The United States Air Quality Index runs 0 to 500 and reports the single worst pollutant. A map showing 45 is American. A map showing 4 is Canadian.

Canada replaced its older index with the health based one on June 24, 2007, and Environment and Climate Change Canada explains the formula and the four risk bands as a blend rather than a single maximum. During smoke events that formula switches to fine particulate alone, published as AQHI+ in British Columbia and Alberta.

Quebec is the documented exception. The province is covered by the federal Info-Smog program, and its own network publishes an hourly index alongside it.

How to Tell in Three Seconds Which Scale You Are Looking At

Check the range, the legend, and who runs the source. Any one usually settles it.

• A value above 10 is American. The Canadian index tops out at 10+.
• A whole number from 1 to 10 on a four band colour scale is Canadian. A six band scale running green to maroon is American.
• Government weather pages report the Canadian index. Global apps and sensor networks usually convert, often labelling it US AQI in small type.

Worth saying plainly, since this page points you to one. The Filterbuy map reports the American scale, as most consumer maps of Canada do. That is not a flaw in the station data. It means you read it against American thresholds rather than Canadian ones.

These are not conversions. No arithmetic turns one index into the other. What lines up is the point where each tells the same group of people to change plans.

• Canadian 1 to 3 and American 0 to 50. No adjustment needed.
• Canadian 4 to 6 and American 51 to 150. People at higher risk should consider rescheduling strenuous outdoor activity.
• Canadian 7 to 10 and American 151 to 200. That advice extends to everyone.
• Canadian above 10 and American above 200. Reduce outdoor exertion, and people at higher risk should stay in.

What Is Probably Driving Today’s Number

The same reading can come from different pollutants depending on the month, and the source changes what actually helps.

• Hot, sunny, still afternoons push ground level ozone up. Environment and Climate Change Canada notes ozone is generally low in winter.
• April through October, a sharp climb with visible haze is almost always wildfire particulate. That is when the particulate only calculation takes over.
• Cold, calm winter days trap pollution under an inversion, often with wood burning on top. Filtration helps. Opening windows does not.

What a Live Map Cannot Tell You

Trust the map for what it measures and nothing further.

• It is not your street. Community values are averages, and conditions vary block to block.
• Real time values are unvalidated. Environment and Climate Change Canada states this data arrives without detailed quality control.
• It says nothing about your indoor air, which can stay high after the outdoor number falls.
• A good reading is not a clean home. Cooking, wood burning, and candles raise indoor particulates regardless.

How to Read Today’s Number and Decide What to Do

Find your community, note the number and its scale, then match it to that band’s advice. On the Canadian scale, moderate begins at 4. On the American scale, the equivalent decision point is 101.

One look at the current AQI today Canada reports is not enough during smoke season. Forecasts are issued twice daily, at 6 a.m. and 5 p.m. local time, with maximums covering the next 72 hours. The pattern we see most is a single morning check followed by an afternoon of plans built on a stale reading.

If you are checking local air quality now for a specific decision, such as a child’s practice or outdoor work, read the observed value and the forecast maximum together.

If you have asthma, chronic obstructive pulmonary disease (COPD), heart disease, or another condition affected by air quality, talk with your physician about a personal action plan. Health Canada’s guidance on wildfire smoke and your health is a useful starting point.

What a High Fine Particulate Reading Means Inside Your Home

Outdoor particulate gets in through gaps around doors and windows and through air intakes. When an air pollution map Canada-wide shows a high reading, three moves do most of the work.

Fine particulate matter (PM2.5) drives most smoke episodes, and PM2.5 levels Canada-wide can stay high for a day or more after a plume passes.

• Close windows and doors, and set heating or cooling to recirculate rather than drawing outdoor air in.
• Fit the highest efficiency filter your equipment handles without restricting airflow. MERV 13 captures smoke sized particles, so confirm your system’s tolerance first.
• Run a certified true HEPA air cleaner in one room and keep that door closed. Health Canada advises a tobacco smoke clean air delivery rate of at least two thirds of the room’s floor area in square feet, so a 120 square foot bedroom needs 80 or higher.
• The sizing error we see most is a unit bought on a headline square footage figure that turns out to be rated for a room twice the size. Check the smoke CADR, not the box.
• Cut indoor sources. Candles, incense, heavy frying, and wood burning all add particles.
• Change filters sooner, since they load faster in smoke. Filterbuy pairs AQI ranges with MERV 8, MERV 11, and MERV 13 beside its map as a starting point.
• Skip ozone generators. Health Canada’s guidance for cleaner air spaces advises against home use.

“The first question I ask is never what the number is. It is which scale produced it. Until you know that, a 4 and a 45 are both just digits on a screen.”

Essential Resources for Checking Canada’s Air Quality Today

Get the Official Canadian Number for Your Community

Environment and Climate Change Canada, Local Air Quality Health Index

The government source for the observed Air Quality Health Index value in your area, updated hourly. It also publishes forecast maximums covering the next 72 hours, which is what you need before committing to an outdoor plan.

Understand What Your Number Actually Means Before You Act on It

Environment and Climate Change Canada, About the Air Quality Health Index

Explains the 1 to 10+ scale, the four risk bands, and the separate health advice for the general population and for people at higher risk. This is the page that settles whether a reading of 4 should change your day.

Find Out Where the Smoke Is Heading Next, Not Just Where It Is Now

BlueSky Canada wildfire smoke forecast, FireSmoke.ca

Animated 48-hour smoke dispersion maps from the University of British Columbia, issued four times daily during fire season. Use it to close the windows before a plume arrives rather than after.

Track Smoke That Crosses the Border in Either Direction

AirNow Fire and Smoke Map information and user guide

Covers Canadian smoke drifting south and United States smoke drifting north, with fire locations layered onto monitor readings. It also gives the clearest explanation of how low cost sensor data is corrected before it appears on a map.

Choose and Size an Air Cleaner That Will Actually Work in Your Room

National Collaborating Centre for Environmental Health, portable air cleaners and wildfire smoke

Evidence-based guidance on sizing, placement, and the gap between certified true HEPA and units labelled “HEPA-type” or “99% effective.” This is the buying decision layer, and it is where most households lose money.

Read the Right Index If You Live in Quebec

Gouvernement du Quebec, Indice de la qualite de l’air interactive map

Quebec is the documented exception to the national index and is covered by the federal Info-Smog program instead. Residents there should work from the provincial hourly map rather than the standard national view.

Supporting Statistics

Three findings from United States federal agencies and national health organizations.

1. You Spend About 90 Percent of Your Time Indoors.

• Indoor levels of some pollutants run 2 to 5 times higher than outdoor levels.
• Why it matters: the indoor steps count as much as the map reading.

Source: U.S. Environmental Protection Agency, Report on the Environment

2. Asthma ER Visits Rose 17 Percent During Canadian Smoke Days.

• Measured across the United States on 19 smoke days, April 30 to August 4, 2023.
• Why it matters: a smoke day is a clinical event, not just a hazy sky.

Source: Centers for Disease Control and Prevention, Morbidity and Mortality Weekly Report

3. 75 Million People Breathed Canadian Smoke in June 2023.

• Air quality reached unhealthy or hazardous levels across the United States.
• Why it matters: distance from the fire is not protection.

Source: American Lung Association

Final Thought & Opinion

The whole page in three lines:

• Canada publishes a 1 to 10+ health risk score. Most apps convert to an American 0 to 500 number.
• Confirm the scale, then read the observed value beside the forecast maximum.
• Then act indoors. Shut the house, filter what is circulating, protect one room.

Now the opinion, which is mine rather than the agencies’. The number gets more attention than it deserves. The plan gets far too little.

The households I have worked with who came through a bad smoke week in decent shape were not refreshing the map every hour. They had settled three things before the season started:

1. Reading closes the windows.

2. Which room the air cleaner lives in.

3. Whether a spare filter is already in the closet.

The map told them when. It did not tell them what to do, because that was already decided.

A low reading is also not at all clear. When the forecast says a plume is coming and the current value looks fine, trust the forecast. Acting early costs a closed window. Acting late costs a day of exposure you cannot take back.

Set your thresholds once, while the air is clean. Then you are checking a map to confirm a plan rather than to build one.

Frequently Asked Questions

Why does one map say 4 and another says 45 for the same city?

Different scales. The Canadian index runs 1 to 10+ and blends three pollutants. The American index runs 0 to 500 and reports the worst one. Both can be right at the same moment.

Does Quebec use the same index?

No. Quebec is covered by Info-Smog, and the provincial network publishes its own hourly index. Check which one a map is showing.

Do masks help outdoors during smoke?

A well fitted N95 style respirator filters fine particles. Clothes and surgical masks do not. Follow your local health authority during a declared event.

Check Canada’s Live Air Quality Index AQI Map Now and Today

Open the map linked in Essential Resources, confirm whether you are reading the Canadian 1 to 10+ scale or the American 0 to 500 one, and note the forecast maximum beside today’s value. Then set your thresholds and get the right filter in place before the next plume arrives.

Glossary

Air Quality Health Index (AQHI). Canada’s official 1 to 10+ scale, adopted June 2007, reporting combined short term health risk from ozone, nitrogen dioxide, and fine particulate rather than a concentration.

AQHI+. The label British Columbia and Alberta use for the particulate only version applied during wildfire smoke events.

Air Quality Index (AQI). The United States 0 to 500 scale, reporting the highest sub index among five pollutants. Many consumer maps apply it to Canadian data.

Info-Smog. The federal program covering Quebec in place of the standard Air Quality Health Index.

Clean air delivery rate (CADR). A rating for how fast a portable air cleaner removes smoke, dust, or pollen from a room. Match the smoke figure to room size.

Filterbuy. Filterbuy is a United States air filter manufacturer that produces pleated HVAC filters in MERV 8, MERV 11, and MERV 13 ratings in standard and custom sizes, and publishes live air quality maps for regions across North America.