Fine particles
11.3µg/m³Fair · 1 hourCAMS model • Open-Meteo
BratislavaAir 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.
Bratislava - latest available concentrations (October 23, 2026, 03:00 local time): PM2.5: 11.3 µg/m³, PM10: 15.2 µg/m³, O₃: 23 µg/m³, NO₂: 22.1 µg/m³, SO₂: 5.7 µg/m³, CO: 215 µg/m³. These are hourly CAMS model values for a point representing the city.
Air quality questions →
1 weather warning in effect for Slovakia
Bratislava · Air pollutant concentrations
Data time: October 23, 2026 · 03:00 · local timeParticulate matter
15.2µg/m³Fair · 1 hourOzone
23µg/m³Good · 1 hourNitrogen dioxide
22.1µg/m³Fair · 1 hourSulphur dioxide
5.7µg/m³Good · 1 hourCarbon monoxide
215µg/m³PM2.5 vs PM10 - what is the difference? → · Models and monitoring stations →
DAILY DATA · Bratislava
Bratislava - air pollution over recent days (2026-08-31 - 2026-10-22)
Concentrations of all available pollutants for this city.
PM2.5Lowest 3.57 2026-09-05Highest 23.57 2026-10-182026-08-31 - 2026-10-22
PM10Lowest 5.22 2026-09-05Highest 28.27 2026-10-182026-08-31 - 2026-10-22
O₃Lowest 41.75 2026-10-20Highest 71.75 2026-09-042026-08-31 - 2026-10-22
NO₂Lowest 4.55 2026-09-06Highest 20.13 2026-10-162026-08-31 - 2026-10-22
SO₂Lowest 2.45 2026-09-05Highest 15.02 2026-10-212026-08-31 - 2026-10-22
COLowest 133.67 2026-09-05Highest 286.04 2026-10-182026-08-31 - 2026-10-22
Scroll the chart or table sideways to see the full period.
| Pollutant | 2026-10-22 | 2026-10-21 | 2026-10-20 | 2026-10-19 | 2026-10-18 | 2026-10-17 | 2026-10-16 | 2026-09-07 | 2026-09-06 | 2026-09-05 | 2026-09-04 | 2026-09-03 | 2026-09-02 | 2026-09-01 | 2026-08-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 | 5.91 | 22.6 | 16.55 | 15.68 | 23.57 | 20.68 | 16.93 | 5.26 | 4.15 | 3.57 | 5.2 | 6.4 | 6.35 | 4.17 | 7.35 |
| PM10 | 7.75 | 27.36 | 19.92 | 19.06 | 28.27 | 26.55 | 22.47 | 9.51 | 7.5 | 5.22 | 8.43 | 9.81 | 9.8 | 6.76 | 11.51 |
| O₃ | 53.08 | 55.96 | 41.75 | 42.75 | 55.79 | 47.21 | 46.29 | 64.38 | 69.42 | 65.54 | 71.75 | 65.38 | 58.54 | 64.46 | 66.29 |
| NO₂ | 10.02 | 9.74 | 11.55 | 14.34 | 11.62 | 19.53 | 20.13 | 8.34 | 4.55 | 6.12 | 7.43 | 11.05 | 14.75 | 7.68 | 10.34 |
| SO₂ | 3.3 | 15.02 | 5 | 6.51 | 6.4 | 10.2 | 10.28 | 4.24 | 2.55 | 2.45 | 3.09 | 4.15 | 7.08 | 3.03 | 4.5 |
| CO | 175.04 | 190.25 | 207.17 | 232.75 | 286.04 | 241.08 | 219.21 | 159.71 | 151.38 | 133.67 | 142.92 | 159.88 | 173 | 153.04 | 149.38 |
A dot on the chart and a dash in the table indicate missing data. The latest day may be incomplete.
AIR QUALITY ARCHIVE · Bratislava
Bratislava - air pollution history (2017-09 - 2020-05)
Compare monthly particle and gas concentrations in the available archive.
PM2.5Lowest 8.96 2019-09Highest 28.17 2020-012017-09 - 2020-05
PM10Lowest 13.9 2020-02Highest 35.67 2018-102017-09 - 2020-05
O₃Lowest 29.7 2018-11Highest 100 2018-082017-09 - 2020-05
NO₂Lowest 13.44 2020-05Highest 33.35 2018-022017-09 - 2020-05
SO₂Lowest 2.29 2020-05Highest 6.99 2020-042017-09 - 2020-05
COLowest 171 2017-09Highest 652 2018-022017-09 - 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 | 12.3 | 17.3 | 16.1 | 11.93 | 28.17 | 15.6 | 15.65 | 17 | 8.96 | 9.79 | 9.52 | 12.16 | 9.29 | 17.2 | 11.35 | 17.4 | 19.85 | 20.2 | 23.1 | 21.35 | 12.64 | 11.58 | 10.88 | 11.25 | 12.2 | 12.2 | 27.75 | 27.25 | 24.35 | 13.9 | 15.05 | 12.5 | 13.5 |
| PM10 | 14.77 | 23.57 | 23.57 | 13.9 | 30.53 | 23.63 | 20.1 | 26.57 | 17.83 | 18.7 | 19.33 | 27.83 | 15 | 27.63 | 18.6 | 24.97 | 22.5 | 23.83 | 31.17 | 35.67 | 23.3 | 22.73 | 20.43 | 21.17 | 25.7 | 26 | 33.47 | 31.7 | 27.47 | 16.63 | 21.3 | 22.2 | 24.3 |
| O₃ | 83.8 | 88.5 | 69.9 | 57.6 | 30 | 36.6 | 31.8 | 51 | 65.7 | 84.8 | 92.5 | 92.7 | 74.8 | 82.5 | 71.8 | 57.5 | 42.9 | 32.8 | 29.7 | 59.9 | 84.7 | 100 | 96.7 | 89.1 | 88 | 80 | 65.6 | 55.7 | 34.7 | 36.9 | 35.4 | 51.3 | 52.4 |
| NO₂ | 13.44 | 20.12 | 21.85 | 22.85 | 31.25 | 26.65 | 24.5 | 24.7 | 19.93 | 19.89 | 18.11 | 18.19 | 20.29 | 24.5 | 26.92 | 32.55 | 31.1 | 29.05 | 29.9 | 29.35 | 29.5 | 25.43 | 20.46 | 20.46 | 22.8 | 24.29 | 30.95 | 33.35 | 28.6 | 24.65 | 30.95 | 26.35 | 28.35 |
| SO₂ | 2.29 | 6.99 | 6.15 | 4.48 | 4.45 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| CO | 234 | 291 | 303 | 287 | 499 | 394 | 392 | 421 | 352 | 329 | 292 | 326 | 354 | 385 | 387 | 476 | 448 | 490 | 593 | 416 | 415 | 272 | 241 | 314 | 427 | 493 | 642 | 652 | 514 | 343 | 331 | 193 | 171 |
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 3
AIR QUALITY ARCHIVE · SK0002A
SK0002A
Station code: SK0002A
Monthly monitoring station data.
PM2.5Lowest 10.7 2020-02Highest 25.7 2020-012017-09 - 2020-05
PM10Lowest 17.4 2020-02Highest 35.7 2018-032017-09 - 2020-05
NO₂Lowest 21.5 2020-05Highest 52.5 2019-022017-09 - 2020-05
COLowest 171 2017-09Highest 652 2018-022017-09 - 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 | 11.5 | 17.1 | 16.6 | 10.7 | 25.7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| PM10 | 18.6 | 28.6 | 27.7 | 17.4 | 33.1 | 26.7 | 22.2 | 30.4 | 21.7 | 21.1 | 21.4 | 31.6 | 18.2 | 27 | 22.1 | 27.9 | 23.6 | 24.1 | 30.8 | 34.8 | 25.9 | 23.7 | 23.7 | 28.3 | 32.6 | 32.5 | 35.7 | 32.4 | 27.8 | 18.7 | 22.4 | 24.5 | 25.9 |
| NO₂ | 21.5 | 32.3 | 33.6 | 35 | 43.7 | 39 | 34 | 36.1 | 30.9 | 31.9 | 31.6 | 30.9 | 33.9 | 40.5 | 44.2 | 52.5 | 44.3 | 38.4 | 40.5 | 44 | 48.4 | 43 | 38.2 | 38.2 | 41.5 | 41 | 43.8 | 49.6 | 37.5 | 32.5 | 42.5 | 38.5 | 43.3 |
| CO | 234 | 291 | 303 | 287 | 499 | 394 | 392 | 421 | 352 | 329 | 292 | 326 | 354 | 385 | 387 | 476 | 448 | 490 | 593 | 416 | 415 | 272 | 241 | 314 | 427 | 493 | 642 | 652 | 514 | 343 | 331 | 193 | 171 |
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 ↗EEA Slovakia
AIR QUALITY ARCHIVE · SK0004A
SK0004A
Station code: SK0004A
Monthly monitoring station data.
PM2.5Lowest 10.4 2019-05Highest 35.6 2020-012017-09 - 2020-05
PM10Lowest 12.5 2020-05Highest 38.5 2018-102017-09 - 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 | 15.8 | 21.2 | 18.1 | 16.3 | 35.6 | — | 18.4 | 19.5 | 11.5 | 12.5 | 11.7 | 14.6 | 10.4 | 19.3 | 12.3 | 17.9 | 21.4 | 22 | 24.4 | 24.3 | 15.6 | 14.4 | 13 | 14.1 | 14 | 13.5 | 28.7 | 27.2 | 27.3 | 15.5 | 16.8 | 13.5 | 14 |
| PM10 | 12.5 | 22.2 | 22.5 | 12.8 | 30.8 | 23.5 | 20.2 | 26.6 | 18 | 20 | 19.7 | 27.5 | 14 | 29.4 | 17.8 | 24.2 | 21.9 | 23.9 | 31.4 | 38.5 | 25.2 | 26.5 | 20.7 | 19.2 | 23.3 | 22.9 | 31.6 | 30.6 | 28 | 16.1 | 21.8 | 22.9 | 24.1 |
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 ↗EEA Slovakia
AIR QUALITY ARCHIVE · SK0048A
SK0048A
Station code: SK0048A
Monthly monitoring station data.
PM2.5Lowest 6.41 2019-09Highest 27.3 2018-022017-09 - 2020-05
PM10Lowest 11.5 2020-02Highest 33.7 2018-102017-09 - 2020-05
O₃Lowest 29.7 2018-11Highest 100 2018-082017-09 - 2020-05
NO₂Lowest 2.72 2018-06Highest 19.7 2018-012017-09 - 2020-05
SO₂Lowest 2.29 2020-05Highest 6.99 2020-042017-09 - 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 | 9.61 | 13.6 | 13.6 | 8.78 | 23.2 | 15.6 | 12.9 | 14.5 | 6.41 | 7.09 | 7.34 | 9.72 | 8.17 | 15.1 | 10.4 | 16.9 | 18.3 | 18.4 | 21.8 | 18.4 | 9.68 | 8.76 | 8.76 | 8.39 | 10.4 | 10.9 | 26.8 | 27.3 | 21.4 | 12.3 | 13.3 | 11.5 | 13 |
| PM10 | 13.2 | 19.9 | 20.5 | 11.5 | 27.7 | 20.7 | 17.9 | 22.7 | 13.8 | 15 | 16.9 | 24.4 | 12.8 | 26.5 | 15.9 | 22.8 | 22 | 23.5 | 31.3 | 33.7 | 18.8 | 18 | 16.9 | 16 | 21.2 | 22.6 | 33.1 | 32.1 | 26.6 | 15.1 | 19.7 | 19.2 | 22.9 |
| O₃ | 83.8 | 88.5 | 69.9 | 57.6 | 30 | 36.6 | 31.8 | 51 | 65.7 | 84.8 | 92.5 | 92.7 | 74.8 | 82.5 | 71.8 | 57.5 | 42.9 | 32.8 | 29.7 | 59.9 | 84.7 | 100 | 96.7 | 89.1 | 88 | 80 | 65.6 | 55.7 | 34.7 | 36.9 | 35.4 | 51.3 | 52.4 |
| NO₂ | 5.38 | 7.94 | 10.1 | 10.7 | 18.8 | 14.3 | 15 | 13.3 | 8.97 | 7.89 | 4.62 | 5.48 | 6.67 | 8.51 | 9.63 | 12.6 | 17.9 | 19.7 | 19.3 | 14.7 | 10.6 | 7.86 | 2.73 | 2.72 | 4.1 | 7.57 | 18.1 | 17.1 | 19.7 | 16.8 | 19.4 | 14.2 | 13.4 |
| SO₂ | 2.29 | 6.99 | 6.15 | 4.48 | 4.45 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
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 ↗EEA Slovakia
Environment and quality of life ratings · Bratislava
Archived ratings of the local environment: green spaces, cleanliness, noise and water quality. Opinion indicators are separate from pollutant concentration measurements.
| Indicator | Bratislava | Hungary | Czech Republic | Poland | Austria | Slovenia |
|---|---|---|---|---|---|---|
| Green and Parks in the City | 59% | 59% | 77% | 62% | 78% | 87% |
| particulate matter PM2.5 (µg/m³) | 14 | — | — | — | — | — |
| Pleasure of spending time in the city | 76% | 65% | 77% | 48% | 84% | 88% |
| particulate matter PM10 (µg/m³) | 23 | — | — | — | — | — |
| Air Pollution | 35% | 49% | 35% | 63% | 21% | 26% |
| Garbage Disposal | 64% | 65% | 74% | 60% | 84% | 87% |
| Availability and quality of drinking water | 86% | 80% | 84% | 65% | 91% | 96% |
| Cleanliness and tidiness | 55% | 52% | 65% | 58% | 82% | 87% |
| Noise and Light pollution | 45% | 45% | 44% | 51% | 34% | 37% |
| Water Pollution | 28% | 30% | 28% | 39% | 14% | 17% |
Air quality in nearby cities
All cities →Slovakia · air quality in other cities
WEATHER & SURROUNDINGS
Bratislava · weather forecast
Daily maximum and minimum temperatures. Forecast point: 48.1459, 17.1071.
Scroll the forecast to see the following days.
Bratislava · October 20, 2026: minimum temperature 5.7°C, maximum 17.4°C. Wind: 21.9 km/h. Humidity: 60%.
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 | 14.8 | 5.7 | 17.4 | 11.9 | 3 | 6.1 | 60 | 44 |
| 2026-10-21 | 17.8 | 9.9 | 19.7 | 15.1 | 6.4 | 5.5 | 51 | 52 |
| 2026-10-22 | 12.9 | 6.4 | 14.4 | 6.4 | 10.8 | 8.1 | 67 | 69 |
| 2026-10-23 | 15.1 | 3.9 | 15.6 | 8.1 | 0.6 | 5.9 | 65 | 78 |
| 2026-10-24 | 9.5 | 5.5 | 11 | 5.5 | 2 | 4.1 | 67 | 98 |
| 2026-10-25 | 7.9 | 3 | 11.8 | 7.8 | 4.9 | 4.8 | 69 | 100 |
| 2026-10-26 | 10.4 | 5.4 | 13.4 | 7.4 | 0.1 | 4.2 | 75 | 100 |
| 2026-10-27 | 8.8 | 4.8 | 12.9 | 8.2 | 0.1 | 3.4 | 84 | 100 |
| 2026-10-28 | 10.5 | 5 | 15.1 | 9.9 | 2.9 | 6.2 | 55 | 49 |
| 2026-10-29 | 11.4 | 6.5 | 13.3 | 10.7 | 1.4 | 4.7 | 61 | 91 |
| 2026-10-30 | 12.1 | 7.1 | 14.5 | 8.8 | 0.7 | 2.6 | 67 | 87 |
| 2026-10-31 | 11.6 | 6.6 | 14.3 | 8.3 | 7.8 | 2.7 | 66 | 85 |
| 2026-11-01 | 11.7 | 6.4 | 14.5 | 8.3 | — | 3.1 | 61 | 4 |
| 2026-11-02 | 11.1 | 5.5 | 14.1 | 6.9 | 2.5 | 6.5 | 59 | 6 |
| 2026-11-03 | 10 | 4.4 | 13.7 | 6.9 | 1.5 | 7.2 | 58 | 74 |
| 2026-11-04 | 8.9 | 4.6 | 12.5 | 6.1 | — | 7.4 | 52 | 4 |
| 2026-11-05 | 8.8 | 3.5 | 11.8 | 10.3 | — | 4.6 | 58 | 31 |
| 2026-11-06 | 9.3 | 7.1 | 11 | 7.1 | — | 4.9 | 55 | 100 |
UV index by day · Bratislava
City data.
You can safely stay in the sun. Sunscreen only matters on very long exposure.
0-2 low3-5 moderate6-7 high8-10 very high11+ extreme
Scroll the forecast to see the following days.
Bratislava · October 22, 2026: UV index: 2.9 .
| 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 | 2.9 | 2.6 | 2.1 | 2.7 | 2.8 | 1.5 | 2.5 | 2.4 | 2.5 | 2.5 | 2 | 2.3 | 2.1 | 0.2 | 0.2 | — |
AIR QUALITY QUESTIONS
Bratislava · air pollution - questions and answers
What do the latest air quality data show for Bratislava?
Bratislava - latest available concentrations (October 23, 2026, 03:00 local time): PM2.5: 11.3 µg/m³, PM10: 15.2 µg/m³, O₃: 23 µg/m³, NO₂: 22.1 µg/m³, SO₂: 5.7 µg/m³, CO: 215 µg/m³. These are hourly CAMS model values for a point representing the city.
When was PM2.5 highest in Bratislava over the past week?
The highest available daily mean PM2.5 was 23.6 µg/m³ (October 18, 2026). This comparison covers 7 days with data in the seven days before October 23, 2026. The day of the latest reading is excluded because it may be incomplete.
What period does the pollution history for Bratislava cover?
Available monthly means cover 2017-09 - 2020-05. The tables include PM2.5, PM10, O₃, NO₂, SO₂, CO. 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 Bratislava 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 Bratislava?
For October 22, 2026, the forecast UV index is 2.9. The UV section also shows the following available days.
What wind speed is forecast for Bratislava?
For October 20, 2026, forecast wind speed is 21.9 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.