Fine particles
3.5µg/m³Good · 1 hourCAMS model • Open-Meteo
MontréalAir quality, PM2.5 and PM10
Check PM2.5 and PM10 particle levels alongside ozone, nitrogen dioxide and other gases. Compare the latest available concentrations with recent days and explore changes in air pollution through the available historical records.
Montréal - latest available concentrations (October 22, 2026, 21:00 local time): PM2.5: 3.5 µg/m³, PM10: 3.6 µg/m³, O₃: 39 µg/m³, NO₂: 19.5 µg/m³, SO₂: 4.1 µg/m³, CO: 327 µg/m³. These are hourly CAMS model values for a point representing the city.
Air quality questions →
5 weather warnings in effect for Canada
Montréal · Air pollutant concentrations
Data time: October 22, 2026 · 21:00 · local timeParticulate matter
3.6µg/m³Good · 1 hourOzone
39µg/m³Good · 1 hourNitrogen dioxide
19.5µg/m³Fair · 1 hourSulphur dioxide
4.1µg/m³Good · 1 hourCarbon monoxide
327µg/m³PM2.5 vs PM10 - what is the difference? → · Models and monitoring stations →
DAILY DATA · Montréal
Montréal - air pollution over recent days (2026-08-30 - 2026-10-21)
Concentrations of all available pollutants for this city.
PM2.5Lowest 2.38 2026-10-17Highest 14.06 2026-08-312026-08-30 - 2026-10-21
PM10Lowest 2.98 2026-10-17Highest 14.09 2026-08-312026-08-30 - 2026-10-21
O₃Lowest 30.17 2026-10-21Highest 63.92 2026-08-302026-08-30 - 2026-10-21
NO₂Lowest 7.69 2026-10-17Highest 28.53 2026-10-212026-08-30 - 2026-10-21
SO₂Lowest 2.57 2026-10-17Highest 12.75 2026-10-212026-08-30 - 2026-10-21
COLowest 144.04 2026-10-17Highest 681.13 2026-10-212026-08-30 - 2026-10-21
Scroll the chart or table sideways to see the full period.
| Pollutant | 2026-10-21 | 2026-10-20 | 2026-10-19 | 2026-10-18 | 2026-10-17 | 2026-10-16 | 2026-10-15 | 2026-09-06 | 2026-09-05 | 2026-09-04 | 2026-09-03 | 2026-09-02 | 2026-09-01 | 2026-08-31 | 2026-08-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 | 13.76 | 5.35 | 3.92 | 4.25 | 2.38 | 4.12 | 9.43 | 4.48 | 6.14 | 9.79 | 7.8 | 7.64 | 7.11 | 14.06 | 6.3 |
| PM10 | 13.98 | 5.41 | 3.93 | 4.42 | 2.98 | 4.15 | 9.7 | 4.64 | 6.46 | 9.94 | 7.91 | 7.96 | 7.15 | 14.09 | 6.4 |
| O₃ | 30.17 | 40.04 | 46.5 | 45.25 | 58.33 | 38.5 | 43.46 | 50.71 | 54.08 | 48.54 | 63.92 | 60.54 | 54.21 | 42.67 | 63.92 |
| NO₂ | 28.53 | 21.53 | 18.1 | 13.94 | 7.69 | 18.63 | 19.98 | 11.65 | 9.42 | 18.53 | 14.34 | 11.66 | 18.58 | 27.59 | 11.3 |
| SO₂ | 12.75 | 5.55 | 5.35 | 4.54 | 2.57 | 4.4 | 6.43 | 3.43 | 3.23 | 3.98 | 3.68 | 3.34 | 5.24 | 7.41 | 3.63 |
| CO | 681.13 | 279.46 | 260 | 188.92 | 144.04 | 236.79 | 308 | 183.67 | 173.71 | 263.92 | 267.92 | 203 | 248.96 | 284.25 | 203.29 |
A dot on the chart and a dash in the table indicate missing data. The latest day may be incomplete.
AIR QUALITY ARCHIVE · Montréal
Montréal - air pollution history (2016-03 - 2020-05)
Compare monthly particle and gas concentrations in the available archive.
PM2.5Lowest 3.26 2016-04Highest 11.37 2020-022016-03 - 2020-05
O₃ (ppm)Lowest 0.01644 2019-10Highest 0.035275 2016-042016-03 - 2020-05
NO₂ (ppm)Lowest 0.003388 2020-05Highest 0.014262 2020-022016-03 - 2020-05
SO₂ (ppm)Lowest 0.001105 2019-09Highest 0.00275 2018-112016-03 - 2020-05
CO (ppm)Lowest 0.1615 2020-05Highest 0.2795 2020-022016-03 - 2020-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 | 2016-11 | 2016-10 | 2016-09 | 2016-08 | 2016-07 | 2016-06 | 2016-05 | 2016-04 | 2016-03 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 µg/m³ | 3.47 | 5.28 | 6.89 | 11.37 | 8.84 | 7.78 | 7.24 | 6.45 | 5.64 | 5.98 | 9.05 | 6.89 | 5.38 | 5.25 | 8.48 | 8.14 | 8.9 | 9.54 | 7.13 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3.26 | 6.83 |
| O₃ (ppm) | 0.02902 | 0.03298 | 0.0301 | 0.02432 | 0.01962 | 0.02082 | 0.01988 | 0.01644 | 0.01916 | 0.02324 | 0.02692 | 0.0262 | 0.02776 | 0.03102 | 0.03252 | 0.02682 | 0.02236 | 0.01714 | 0.01866 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 0.0301 | 0.035275 | 0.0279 |
| NO₂ (ppm) | 0.003388 | 0.004864 | 0.008402 | 0.014262 | 0.013994 | 0.010688 | 0.009978 | 0.008714 | 0.006586 | 0.006356 | 0.00707 | 0.007338 | 0.00674 | 0.007448 | 0.011986 | 0.013256 | 0.012888 | 0.012974 | 0.01142 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 0.00375 | 0.0112 |
| SO₂ (ppm) | 0.00133 | 0.001223 | 0.001343 | 0.001253 | 0.001375 | 0.00128 | 0.001407 | 0.001307 | 0.001105 | 0.001167 | 0.001245 | 0.001193 | 0.00162 | 0.00224 | 0.00115 | 0.001623 | 0.001467 | 0.00159 | 0.00275 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| CO (ppm) | 0.1615 | 0.17 | 0.217 | 0.2795 | 0.271 | 0.225 | 0.2195 | 0.227 | 0.215 | 0.2025 | 0.215 | 0.194 | 0.1895 | 0.2015 | 0.248 | 0.2505 | 0.254 | 0.268 | 0.231 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
Historical data by station 7
AIR QUALITY ARCHIVE · Aéroport de Montr��al
Aéroport de Montr��al
Station code: Aéroport de Montréal
Monthly monitoring station data.
PM2.5Lowest 3.19 2020-05Highest 10.8 2020-022018-11 - 2020-05
O₃ (ppm)Lowest 0.0163 2018-12Highest 0.0347 2020-042018-11 - 2020-05
NO₂ (ppm)Lowest 0.00256 2020-05Highest 0.0158 2020-022018-11 - 2020-05
CO (ppm)Lowest 0.139 2020-05Highest 0.254 2020-022018-11 - 2020-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 µg/m³ | 3.19 | 4.65 | 6.31 | 10.8 | 8.13 | 6.72 | 6.9 | 5.95 | 5.32 | 5.66 | 8.32 | 5.69 | 4.57 | 4.52 | 7.36 | 7.43 | 8.42 | 9.46 | 6.08 |
| O₃ (ppm) | 0.0323 | 0.0347 | 0.0312 | 0.023 | 0.0186 | 0.0205 | 0.0209 | 0.017 | 0.0204 | 0.0256 | 0.0296 | 0.028 | 0.0284 | 0.0307 | 0.0329 | 0.0262 | 0.0222 | 0.0163 | 0.0185 |
| NO₂ (ppm) | 0.00256 | 0.00515 | 0.00947 | 0.0158 | 0.0157 | 0.0114 | 0.0103 | 0.00984 | 0.00693 | 0.00629 | 0.00652 | 0.00657 | 0.00687 | 0.00703 | 0.0114 | 0.0147 | 0.0137 | 0.0149 | 0.0116 |
| CO (ppm) | 0.139 | 0.159 | 0.2 | 0.254 | 0.244 | 0.203 | 0.188 | 0.194 | 0.18 | 0.172 | 0.176 | 0.16 | 0.166 | 0.181 | 0.223 | 0.235 | 0.234 | 0.249 | 0.206 |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
How should I interpret the data and averaging period? →
OpenAQ ↗AirNow
AIR QUALITY ARCHIVE · Duncan
Duncan
Station code: Duncan
Monthly monitoring station data.
PM2.5Lowest 5.23 2020-05Highest 14.5 2020-022016-03 - 2020-05
O₃ (ppm)Lowest 0.0138 2018-12Highest 0.032 2016-042016-03 - 2020-05
NO₂ (ppm)Lowest 0.00625 2020-05Highest 0.0205 2020-022016-03 - 2020-05
CO (ppm)Lowest 0.181 2020-04Highest 0.305 2020-022016-03 - 2020-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 | 2016-11 | 2016-10 | 2016-09 | 2016-08 | 2016-07 | 2016-06 | 2016-05 | 2016-04 | 2016-03 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 µg/m³ | 5.23 | 6.82 | 9.05 | 14.5 | 11.1 | 9.65 | 8.73 | 8.19 | 7.54 | 8.17 | 11.9 | 9.39 | 6.95 | 6.86 | 12.1 | 11 | 11.8 | 12.3 | 9.52 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| O₃ (ppm) | 0.0273 | 0.031 | 0.0266 | 0.019 | 0.0149 | 0.0177 | 0.0158 | 0.0138 | 0.0162 | 0.0197 | 0.0232 | 0.0227 | 0.0243 | 0.0274 | 0.0264 | 0.0221 | 0.0181 | 0.0138 | 0.0147 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 0.024 | 0.032 | 0.0232 |
| NO₂ (ppm) | 0.00625 | 0.00707 | 0.0117 | 0.0205 | 0.0196 | 0.015 | 0.0142 | 0.0118 | 0.0101 | 0.0104 | 0.0112 | 0.0111 | 0.00961 | 0.0106 | 0.0172 | 0.0185 | 0.0177 | 0.0172 | 0.0162 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| CO (ppm) | 0.184 | 0.181 | 0.234 | 0.305 | 0.298 | 0.247 | 0.251 | 0.26 | 0.25 | 0.233 | 0.254 | 0.228 | 0.213 | 0.222 | 0.273 | 0.266 | 0.274 | 0.287 | 0.256 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
How should I interpret the data and averaging period? →
OpenAQ ↗AirNow
AIR QUALITY ARCHIVE · Molson
Molson
Station code: Molson
Monthly monitoring station data.
PM2.5Lowest 2.63 2020-05Highest 10 2020-022016-03 - 2020-05
O₃ (ppm)Lowest 0.0158 2019-10Highest 0.0388 2016-042016-03 - 2020-05
NO₂ (ppm)Lowest 0.003 2020-05Highest 0.0155 2020-012016-03 - 2020-05
SO₂ (ppm)Lowest 0.001 2019-05Highest 0.00144 2019-112016-03 - 2020-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 | 2016-11 | 2016-10 | 2016-09 | 2016-08 | 2016-07 | 2016-06 | 2016-05 | 2016-04 | 2016-03 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 µg/m³ | 2.63 | 3.96 | 5.57 | 10 | 7.93 | 6.74 | 5.73 | 5.08 | 4.08 | 4.73 | 7.31 | 6.8 | 4.56 | 4.5 | 7.74 | 7.32 | 8.18 | 9.54 | 6.11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3.26 | 6.83 |
| O₃ (ppm) | 0.0303 | 0.0327 | 0.0294 | 0.0242 | 0.0192 | 0.0201 | 0.0191 | 0.0158 | 0.0192 | 0.0247 | 0.0295 | 0.0277 | 0.0279 | 0.0307 | 0.0319 | 0.0256 | 0.021 | 0.0168 | 0.0175 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 0.0388 | 0.0258 |
| NO₂ (ppm) | 0.003 | 0.00547 | 0.00897 | 0.0152 | 0.0155 | 0.0121 | 0.00954 | 0.00826 | 0.00566 | 0.00523 | 0.00639 | 0.0077 | 0.00748 | 0.008 | 0.0128 | 0.0145 | 0.0143 | 0.0137 | 0.013 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 0.00375 | 0.0112 |
| SO₂ (ppm) | — | 0.00117 | 0.001 | 0.00133 | — | 0.001 | 0.00144 | 0.00125 | 0.001 | 0.0012 | 0.00125 | 0.00129 | 0.001 | 0.0012 | 0.00125 | 0.00113 | 0.00114 | 0.00114 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
How should I interpret the data and averaging period? →
OpenAQ ↗AirNow
AIR QUALITY ARCHIVE · Saint-Jean-Baptiste
Saint-Jean-Baptiste
Station code: Saint-Jean-Baptiste
Monthly monitoring station data.
PM2.5Lowest 3.25 2020-05Highest 11.8 2020-022016-03 - 2020-05
O₃ (ppm)Lowest 0.016 2019-10Highest 0.0338 2019-032016-03 - 2020-05
NO₂ (ppm)Lowest 0.00325 2020-05Highest 0.0115 2019-032016-03 - 2020-05
SO₂ (ppm)Lowest 0.0012 2019-03Highest 0.00328 2019-042016-03 - 2020-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 | 2016-11 | 2016-10 | 2016-09 | 2016-08 | 2016-07 | 2016-06 | 2016-05 | 2016-04 | 2016-03 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 µg/m³ | 3.25 | 5.42 | 7.18 | 11.8 | 9.01 | 7.98 | 7.29 | 6.21 | 5.61 | 5.41 | 8.56 | 6.28 | 5.24 | 5.67 | 8.42 | 7.87 | 9.18 | 9.66 | 7.61 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| O₃ (ppm) | 0.0289 | 0.0327 | 0.031 | 0.0258 | 0.0207 | 0.0218 | 0.02 | 0.016 | 0.019 | 0.0232 | 0.0277 | 0.025 | 0.0285 | 0.032 | 0.0338 | 0.0286 | 0.0228 | 0.0182 | 0.0196 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 0.031 | 0.0328 | 0.0293 |
| NO₂ (ppm) | 0.00325 | 0.00413 | 0.00632 | 0.0114 | 0.0112 | 0.00852 | 0.0097 | 0.00787 | 0.00645 | 0.00606 | 0.007 | 0.0077 | 0.00581 | 0.00717 | 0.0115 | 0.0108 | 0.0108 | 0.0099 | 0.0097 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| SO₂ (ppm) | 0.00133 | 0.0015 | 0.0017 | 0.00129 | 0.00125 | 0.00159 | 0.00178 | 0.00167 | 0.00121 | 0.0013 | 0.00124 | 0.00129 | 0.00224 | 0.00328 | 0.0012 | 0.00274 | 0.00226 | 0.00177 | 0.00275 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
How should I interpret the data and averaging period? →
OpenAQ ↗AirNow
AIR QUALITY ARCHIVE · Sainte-Anne-de-Belle
Sainte-Anne-de-Belle
Station code: Sainte-Anne-de-Belle
Monthly monitoring station data.
PM2.5Lowest 3.57 2019-05Highest 10.2 2020-022016-03 - 2020-05
O₃ (ppm)Lowest 0.0196 2019-10Highest 0.0376 2019-032016-03 - 2020-05
NO₂ (ppm)Lowest 0.00188 2020-05Highest 0.00917 2018-122016-03 - 2020-05
SO₂ (ppm)Lowest 0.001 2019-01Highest 0.00186 2018-122016-03 - 2020-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 | 2016-11 | 2016-10 | 2016-09 | 2016-08 | 2016-07 | 2016-06 | 2016-05 | 2016-04 | 2016-03 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 µg/m³ | 3.58 | 5.95 | 6.38 | 10.2 | 7.63 | 7.07 | 6.28 | 5.36 | 4.31 | 5.06 | 7.5 | 4.05 | 3.57 | 3.6 | 6.75 | 7.03 | 7.16 | 8.14 | 5.7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| O₃ (ppm) | 0.0263 | 0.0338 | 0.0323 | 0.0296 | 0.0247 | 0.024 | 0.0236 | 0.0196 | 0.021 | 0.023 | 0.0246 | 0.0276 | 0.0297 | 0.0343 | 0.0376 | 0.0316 | 0.0277 | 0.0206 | 0.023 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 0.0353 | 0.0375 | 0.0333 |
| NO₂ (ppm) | 0.00188 | 0.0025 | 0.00555 | 0.00841 | 0.00797 | 0.00642 | 0.00615 | 0.0058 | 0.00379 | 0.0038 | 0.00424 | 0.00362 | 0.00393 | 0.00444 | 0.00703 | 0.00778 | 0.00794 | 0.00917 | 0.0066 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| SO₂ (ppm) | — | 0.001 | 0.00133 | 0.00114 | 0.0015 | 0.00125 | 0.001 | 0.001 | — | 0.001 | — | 0.001 | — | — | 0.001 | 0.001 | 0.001 | 0.00186 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
How should I interpret the data and averaging period? →
OpenAQ ↗AirNow
AIR QUALITY ARCHIVE · York-Roberval
York-Roberval
Station code: St-Dominique
Monthly monitoring station data.
PM2.5Lowest 3.59 2020-05Highest 10.1 2020-022018-11 - 2020-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 | 3.59 | 5.15 | 6.31 | 10.1 | 8.35 | 7.47 | 6.68 | 6.2 | 5.79 | 5.77 | 8.09 | 5.99 | 5.26 | 5.37 | 8.01 | 7.48 | 8.31 | 8.77 | 7.41 |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
How should I interpret the data and averaging period? →
OpenAQ ↗AirNow
AIR QUALITY ARCHIVE · York-Roberval
York-Roberval
Station code: York-Roberval
Monthly monitoring station data.
PM2.5Lowest 2.84 2020-05Highest 12.2 2020-022018-11 - 2020-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 | 2.84 | 4.99 | 7.43 | 12.2 | 9.74 | 8.85 | 9.07 | 8.19 | 6.83 | 7.09 | 11.7 | 10 | 7.53 | 6.23 | 8.99 | 8.85 | 9.26 | 8.91 | 7.49 |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
Environment and quality of life ratings · Montréal
Archived ratings of the local environment: green spaces, cleanliness, noise and water quality. Opinion indicators are separate from pollutant concentration measurements.
| Indicator | Montréal | United States | Saint Pierre and Miquelon | The Bahamas | Venezuela | Iceland |
|---|---|---|---|---|---|---|
| Green and Parks in the City | 81% | 70% | — | 50% | 41% | 72% |
| particulate matter PM2.5 (µg/m³) | 8 | — | — | — | — | — |
| Pleasure of spending time in the city | 81% | 75% | — | 53% | 41% | 89% |
| particulate matter PM10 (µg/m³) | 15 | — | — | — | — | — |
| Air Pollution | 30% | 29% | — | 52% | 59% | 13% |
| Garbage Disposal | 72% | 71% | — | 29% | 18% | 79% |
| Availability and quality of drinking water | 83% | 71% | — | 55% | 28% | 96% |
| Cleanliness and tidiness | 62% | 60% | — | 35% | 22% | 75% |
| Noise and Light pollution | 49% | 47% | — | 39% | 47% | 23% |
| Water Pollution | 36% | 44% | — | 58% | 76% | 8.4% |
Air quality in nearby cities
All cities →Canada↗
Ottawa
PM2.51.2
PM101.4
µg/m³
PM2.5 · GoodNO₂ 5.4O₃ 53
October 22, 202621:00
Canada↗
Oshawa
PM2.52.8
PM102.8
µg/m³
PM2.5 · GoodNO₂ 6.9O₃ 56
October 22, 202621:00
Canada↗
Markham
PM2.53.5
PM103.6
µg/m³
PM2.5 · GoodNO₂ 8.6O₃ 57
October 22, 202621:00
Canada↗
Québec
PM2.53.1
PM103.2
µg/m³
PM2.5 · GoodNO₂ 17O₃ 41
October 22, 202621:00
Canada↗
Toronto
PM2.54.2
PM104.3
µg/m³
PM2.5 · GoodNO₂ 15.9O₃ 62
October 22, 202621:00
Canada↗
Buffalo
PM2.512.8
PM1012.9
µg/m³
PM2.5 · FairNO₂ 30.2O₃ 44
October 22, 202621:00
Canada↗
Mississauga
PM2.54.2
PM104.3
µg/m³
PM2.5 · GoodNO₂ 15.9O₃ 62
October 22, 202621:00
Canada↗
Brampton
PM2.54.2
PM104.3
µg/m³
PM2.5 · GoodNO₂ 15.9O₃ 62
October 22, 202621:00
Canada · air quality in other cities
WEATHER & SURROUNDINGS
Montréal · weather forecast
Daily maximum and minimum temperatures. Forecast point: 45.5088, -73.5878.
Scroll the forecast to see the following days.
Montréal · October 20, 2026: minimum temperature 4.6°C, maximum 15.8°C. Wind: 11.6 km/h. Humidity: 49%.
Full forecast: temperature, rainfall, wind and humidity
| Date | Day °C | Min °C | Max °C | Night °C | Rain mm | Wind m/s | Humidity % | Clouds % |
|---|---|---|---|---|---|---|---|---|
| 2026-10-20 | 14.4 | 4.6 | 15.8 | 6.9 | 0.1 | 3.2 | 49 | 53 |
| 2026-10-21 | 11.9 | 0.8 | 14.6 | 5.2 | 1.7 | 2.2 | 59 | 9 |
| 2026-10-22 | 11.9 | 3.1 | 14 | 3.4 | 0.8 | 3.9 | 73 | 83 |
| 2026-10-23 | 10 | -0.7 | 10.7 | 4.4 | 0.2 | 3.3 | 63 | 25 |
| 2026-10-24 | 8.6 | 1.6 | 11 | 5.6 | 2.5 | 1.5 | 75 | 1 |
| 2026-10-25 | 8.1 | 3 | 12.9 | 9.3 | 0.2 | 3 | 80 | 7 |
| 2026-10-26 | 9.1 | 8 | 11.4 | 8 | 1.9 | 3.1 | 95 | 100 |
| 2026-10-27 | 5.1 | 1.8 | 7 | 4.3 | 5 | 2.3 | 65 | 81 |
| 2026-10-28 | 3.8 | 2.7 | 3.8 | 3.1 | 2.7 | 2.9 | 68 | 100 |
| 2026-10-29 | 4.8 | 2.9 | 7.4 | 4.4 | 0.5 | 4.7 | 59 | 5 |
| 2026-10-30 | 7.3 | 3.9 | 11 | 6.7 | 2.6 | 4.6 | 65 | 19 |
| 2026-10-31 | 8.7 | 4.4 | 13.3 | 8 | 7.1 | 2.9 | 59 | 78 |
| 2026-11-01 | 11 | 6.6 | 14.2 | 10.3 | 0.2 | 4.3 | 57 | 78 |
| 2026-11-02 | 9.3 | 8.5 | 10.9 | 10.9 | 8.1 | 6.7 | 76 | 100 |
| 2026-11-03 | 4.6 | 1.7 | 9.3 | 1.7 | 0.7 | 8 | 68 | 75 |
| 2026-11-04 | -1.4 | -2.1 | 0.9 | -0.7 | 0.4 | 5.9 | 65 | 76 |
| 2026-11-05 | 5 | 0.9 | 9.5 | 9.5 | 13.4 | 7.7 | 83 | 100 |
UV index by day · Montréal
City data.
Seek shade around midday. SPF 30+, sunglasses and a hat for longer stays.
0-2 low3-5 moderate6-7 high8-10 very high11+ extreme
Scroll the forecast to see the following days.
Montréal · October 22, 2026: UV index: 3.3 .
| Indicator | 2026-10-22 | 2026-10-23 | 2026-10-24 | 2026-10-25 | 2026-10-26 | 2026-10-27 | 2026-10-28 | 2026-10-29 | 2026-10-30 | 2026-10-31 | 2026-11-01 | 2026-11-02 | 2026-11-03 | 2026-11-04 | 2026-11-05 | 2026-11-06 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index | 3.3 | 3.5 | 3.4 | 3.5 | 0.9 | 3.2 | 0.7 | 1.3 | 2.2 | 2.9 | 1.5 | 2.6 | 0.4 | 2.8 | 2.8 | — |
AIR QUALITY QUESTIONS
Montréal · air pollution - questions and answers
What do the latest air quality data show for Montréal?
Montréal - latest available concentrations (October 22, 2026, 21:00 local time): PM2.5: 3.5 µg/m³, PM10: 3.6 µg/m³, O₃: 39 µg/m³, NO₂: 19.5 µg/m³, SO₂: 4.1 µg/m³, CO: 327 µg/m³. These are hourly CAMS model values for a point representing the city.
When was PM2.5 highest in Montréal over the past week?
The highest available daily mean PM2.5 was 13.8 µg/m³ (October 21, 2026). This comparison covers 7 days with data in the seven days before October 22, 2026. The day of the latest reading is excluded because it may be incomplete.
What period does the pollution history for Montréal cover?
Available monthly means cover 2016-03 - 2020-05. The tables include PM2.5, O₃ (ppm), NO₂ (ppm), SO₂ (ppm), CO (ppm). Missing values are marked with a dash, not treated as zero. Monthly archives and current model data may come from different sources.
Is the PM2.5 concentration for Montréal an AQI score?
No. PM2.5 and PM10 are concentrations in µg/m³. AQI is a separate index calculated using a defined scale. When comparing air quality, also check other pollutants, the date and the averaging period.
What UV index does the available forecast show for Montréal?
For October 22, 2026, the forecast UV index is 3.3. The UV section also shows the following available days.
What wind speed is forecast for Montréal?
For October 20, 2026, forecast wind speed is 11.6 km/h. The weather table includes wind, temperature and other available parameters for subsequent days.
PM2.5 · PM10 · NO₂ · O₃
Understanding air quality and pollution data
What do PM2.5 and PM10 mean?
PM2.5 and PM10 are fractions of airborne particulate matter. PM2.5 covers fine particles up to 2.5 micrometres in diameter, while PM10 covers particles up to 10 micrometres. Concentrations in µg/m³ tell you how many micrograms of particles are present in a cubic metre of air. Compare values over the same time period.
Where does the air pollution data come from?
The latest concentrations come from the CAMS atmospheric model via Open-Meteo for each city’s coordinates. Values describe a model area, so conditions on individual streets may differ. Historical monitoring station data is shown separately where available.
How does PM2.5 concentration differ from AQI?
PM2.5 is the concentration of one particle fraction, expressed in µg/m³. AQI is an index calculated using a particular scale and thresholds. The pollutant cards show concentrations. Our city ranking compares PM2.5; PM10, ozone, nitrogen dioxide and other available gases add to the picture of air quality.
Which dates do the values and charts cover?
Each current value has a data date and time. Current concentration cards show the latest available hour, daily charts summarise individual days, and monthly records let you compare longer periods. These values represent different time intervals.
How can I check pollution in my city?
Search for your city and open its air quality page. Start with PM2.5 and PM10, then check the other available pollutants and the data timestamp. Charts and tables help you compare concentrations over time. Weather and historical climate information complement the pollution data.