Smog in Hamilton — Live Data: AQI, Fine Dust, Wind, UV and Health Advice

The latest data Last 7 days
Latest air quality data: Hamilton
Locations: Toronto » Montréal » Vancouver » Calgary » Ottawa » Edmonton » Mississauga » Winnipeg » Québec » Hamilton Brampton » Kitchener » Surrey » Halifax » London » Okanagan » Victoria » Markham » Buffalo » Oshawa »
Pollution and air quality forecast for Hamilton. Today is Thursday, August 27, 2026. The following air pollution values have been recorded for Hamilton:
  1. particulate matter (PM2.5) dust - 5 (Good)
  2. particulate matter (PM10) suspended dust - 5 (Good)
  3. ozone (O3) - 86 (Moderate)
  4. nitrogen dioxide (NO2) - 15 (Good)
  5. sulfur dioxide (SO2) - 3 (Good)
  6. carbon monoxide (CO) - 344 (Good)
Real-time Air Quality Index (AQI) for Hamilton, Wednesday, August 26, 2026: 2.

air quality index: 1
AQI 2 Moderate

What is the air quality in Hamilton today? Is the air polluted in Hamilton?. Is there smog?

Today (Wednesday, August 26, 2026) air quality is moderate in Hamilton. Some pollutants in Hamilton may slightly affect very few hypersensitive individuals. Air pollutants in Hamilton may cause minor breathing discomfort to sensitive people.


What is the current level of PM2.5 in Hamilton? (particulate matter (PM2.5) dust)
Today's PM2.5 level is: 5 (Good) For comparison, the highest level of PM2.5 in Hamilton in the last 7 days was: 9 (Thursday, August 20, 2026) and the lowest: 4 (Tuesday, August 25, 2026).

What is the level of PM10 today in Hamilton? (particulate matter (PM10) suspended dust)
The current level of particulate matter PM10 in Hamilton is: 5 (Good)

How is the O3 level today in Hamilton? (ozone (O3))
86 (Moderate)

How high is the level of NO2? (nitrogen dioxide (NO2))
15 (Good)

What is the level of SO2 pollution? (sulfur dioxide (SO2))
3 (Good)

How high is the CO level? (carbon monoxide (CO))
344 (Good)



Current data Wednesday, August 26, 2026 at 9:00 PM

PM2,5 5 (Good)

PM10 5 (Good)

O3 86 (Moderate)

NO2 15 (Good)

SO2 3 (Good)

CO 344 (Good)

Data on air pollution from recent days in Hamilton

index 2026-08-26 2026-08-25 2026-08-24 2026-08-23 2026-08-22 2026-08-21 2026-08-20 2026-08-19
pm25 6
Good		 4
Good		 4
Good		 4
Good		 5
Good		 5
Good		 9
Good		 7
Good
pm10 6
Good		 4
Good		 4
Good		 4
Good		 5
Good		 5
Good		 9
Good		 7
Good
o3 62
Good		 56
Good		 45
Good		 60
Good		 82
Moderate		 64
Good		 58
Good		 80
Moderate
no2 18
Good		 9
Good		 5
Good		 4
Good		 10
Good		 16
Good		 18
Good		 9
Good
so2 4
Good		 2
Good		 1
Good		 1
Good		 2
Good		 4
Good		 5
Good		 2
Good
co 299
Good		 196
Good		 148
Good		 150
Good		 214
Good		 250
Good		 243
Good		 185
Good
data source »

Hamilton

Wednesday, August 26, 2026 at 9:00 PM

PM2,5 5.1 (Good)

particulate matter (PM2.5) dust

PM10 5.1 (Good)

particulate matter (PM10) suspended dust

O3 86 (Moderate)

ozone (O3)

NO2 15 (Good)

nitrogen dioxide (NO2)

SO2 3.2 (Good)

sulfur dioxide (SO2)

CO 344 (Good)

carbon monoxide (CO)

Hamilton

index 2026-08-19 2026-08-20 2026-08-21 2026-08-22 2026-08-23 2026-08-24 2026-08-25 2026-08-26
pm25 7.4 8.7 4.9 5.4 3.5 3.6 4.2 5.9
pm10 7.5 8.9 5 5.4 3.5 3.6 4.3 6
o3 80 58 64 82 60 45 56 62
no2 8.6 18 16 9.8 4.1 5.3 8.7 18
so2 2.2 4.7 4.1 2.5 0.99 1.2 2 3.8
co 185 243 250 214 150 148 196 299

* Pollution data source: https://openaq.org () The data is licensed under CC-By 4.0

🌦️ Weather · 16-day Forecast — Canada

🌦️ WEATHER · 16-DAY FORECASTCanada🌧️22°RainToday · ↑22° ↓15°💨 6 km/h · 💧 73%Mon24.08🌧️22°15°Tue25.08☀️21°11°Wed26.08☀️24°9°Thu27.08🌤️26°11°Fri28.08🌧️20°14°Sat29.08🌧️19°12°Sun30.08☁️18°9°Mon31.08☁️21°7°Tue1.09☁️23°10°Wed2.09🌧️22°13°Thu3.09🌧️18°12°Fri4.09🌨️12°2°Sat5.09🌧️3°2°Sun6.09🌧️7°3°Mon7.09🌧️7°4°Tue8.09🌧️9°5°pollution-alert.com · August 27, 2026

16-day weather forecast for Canada: today around 22°C (rain), lows near 15°C. Daily temperature and conditions, updated every day. Strong wind (about 21 km/h) is actively clearing smog and dust away.

☀️ UV Index · 16-day Forecast — Canada

☀️ UV INDEX · 16-DAY FORECASTCanada03681111+5.2UV MODERATEtoday, day maxSeek shade around midday. SPF 30+, sunglasses and ahat for longer stays.⏱ Unprotected fair skin can burn in about 40 min5Wed26.085Thu27.084Fri28.085Sat29.085Sun30.084Mon31.084Tue1.094Wed2.092Thu3.091Fri4.091Sat5.094Sun6.094Mon7.093Tue8.093Wed9.094Thu10.090-2 low3-5 moderate6-7 high8-10 very high11+ extremepollution-alert.com · August 27, 2026

The UV index in Canada today is 5.2 (moderate) — unprotected fair skin can burn in about 40 minutes.

📍 Air quality in nearby cities

Live PM2.5 around Hamilton — compare nearby locations.

Frequently asked questions

Is the air safe to breathe in Hamilton today?
The current average PM2.5 across Hamilton is about 5 µg/m³, rated “Good”. Air quality is good — outdoor activities are fine for everyone.
What is the current PM2.5 level in Hamilton?
Right now PM2.5 in Hamilton averages about 5 µg/m³ (“Good”). PM2.5 are fine particles small enough to reach the lungs and bloodstream.
Which day last week had the worst air in Hamilton?
Over the past week, the highest daily PM2.5 in Hamilton was recorded on Thursday, August 20 (about 9 µg/m³).
What is the UV index in Hamilton today?
The UV index in Hamilton today is 5.2 (moderate) — unprotected fair skin can burn in about 40 minutes.
Does today's wind help disperse smog in Hamilton?
Strong wind (about 21 km/h) is actively clearing smog and dust away.
How is air quality measured?
Air quality here is based on PM2.5 — the concentration of fine particulate matter in µg/m³. Lower values mean cleaner air. Data is updated daily from Open-Meteo.