Fine particles
1.7µg/m³Good · 1 hourCAMS model • Open-Meteo
LeónAir 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.
León - latest available concentrations (October 22, 2026, 19:00 local time): PM2.5: 1.7 µg/m³, PM10: 2 µg/m³, O₃: 69 µg/m³, NO₂: 5.5 µg/m³, SO₂: 1.3 µg/m³, CO: 161 µg/m³. These are hourly CAMS model values for a point representing the city.
Air quality questions →León · Air pollutant concentrations
Data time: October 22, 2026 · 19:00 · local timeParticulate matter
2µg/m³Good · 1 hourOzone
69µg/m³Fair · 1 hourNitrogen dioxide
5.5µg/m³Good · 1 hourSulphur dioxide
1.3µg/m³Good · 1 hourCarbon monoxide
161µg/m³PM2.5 vs PM10 - what is the difference? → · Models and monitoring stations →
DAILY DATA · León
León - air pollution over recent days (2026-08-30 - 2026-10-21)
Concentrations of all available pollutants for this city.
PM2.5Lowest 1.83 2026-10-18Highest 14.95 2026-09-032026-08-30 - 2026-10-21
PM10Lowest 2.15 2026-10-18Highest 15.7 2026-09-032026-08-30 - 2026-10-21
O₃Lowest 57.96 2026-10-15Highest 88.46 2026-09-042026-08-30 - 2026-10-21
NO₂Lowest 1.63 2026-10-17Highest 13.45 2026-09-022026-08-30 - 2026-10-21
SO₂Lowest 0.67 2026-10-17Highest 4.99 2026-09-022026-08-30 - 2026-10-21
COLowest 129.04 2026-10-17Highest 361.71 2026-09-022026-08-30 - 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 | 2.78 | 2.54 | 2.08 | 1.83 | 1.83 | 2.48 | 6.87 | 8.48 | 10.45 | 12.72 | 14.95 | 11.69 | 7.85 | 8.88 | 6.89 |
| PM10 | 3.23 | 2.91 | 2.19 | 2.15 | 2.27 | 2.74 | 7.5 | 9 | 11.05 | 13.17 | 15.7 | 12.38 | 8.92 | 10.43 | 8.55 |
| O₃ | 63.21 | 69.83 | 63.04 | 74 | 80.75 | 63.08 | 57.96 | 74.5 | 78.58 | 88.46 | 75.42 | 65.13 | 70.79 | 76.54 | 68.21 |
| NO₂ | 5.1 | 6.09 | 5.7 | 2.83 | 1.63 | 4.1 | 8.59 | 8.93 | 11.03 | 11.37 | 10.46 | 13.45 | 10.47 | 8.3 | 6.64 |
| SO₂ | 1.59 | 1.4 | 1.6 | 1.08 | 0.67 | 1.63 | 2.31 | 2.88 | 3.02 | 3.7 | 4.04 | 4.99 | 3.5 | 4.18 | 2.9 |
| CO | 168.29 | 184.54 | 176.79 | 146.75 | 129.04 | 159.04 | 195.04 | 165.21 | 231.5 | 318.46 | 302.54 | 361.71 | 277.71 | 211.25 | 190.79 |
A dot on the chart and a dash in the table indicate missing data. The latest day may be incomplete.
AIR QUALITY ARCHIVE · León
León - air pollution history (2016-03 - 2020-05)
Compare monthly particle and gas concentrations in the available archive.
PM2.5Lowest 12.3 2018-10Highest 43.8 2016-042016-03 - 2020-05
PM10Lowest 29.3 2020-05Highest 88.77 2017-012016-03 - 2020-05
O₃ (ppm)Lowest 0.0184 2018-11Highest 0.0445 2017-052016-03 - 2020-05
SO₂ (ppm)Lowest 0.0029 2016-09Highest 0.0206 2017-122016-03 - 2020-05
CO (ppm)Lowest 0.458 2018-10Highest 2.236 2018-072016-03 - 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 | — | — | 23.4 | 17 | 26.6 | 22.3 | 18.3 | 15.4 | 15.7 | 20.5 | 19.7 | 19.4 | 29.6 | 26 | 21.9 | 17.8 | 18.9 | 21.8 | 18 | 12.3 | — | 22.5 | 27.3 | 17.1 | 23.7 | 23.5 | 21.3 | 18.1 | 17.9 | 31 | — | 22.9 | — | 15.4 | — | 23 | 43.3 | 29.6 | 21.3 | 25.8 | 38.4 | 30.3 | 17.4 | 14.1 | 19.6 | 19.2 | 38.1 | 31.1 | 38.3 | 43.8 | 30 |
| PM10 µg/m³ | 29.3 | 39.8 | 45 | 39.73 | 40.73 | 47.57 | 33.1 | 30.93 | 29.63 | 34.07 | 38.27 | 38.47 | 64 | 63.23 | 62.57 | 58.8 | 58.03 | 66.1 | 51.37 | 37.4 | 41.17 | 34.95 | 53.5 | 37.53 | 56.53 | 66.23 | 66.53 | 56.9 | 71.6 | 87.9 | 68.67 | 49.53 | 42.97 | 44.03 | 44.47 | 53.4 | 86.07 | 71.07 | 65.8 | 77.27 | 88.77 | 79 | 57.27 | 51.8 | 47.6 | 39.17 | 39.5 | 36.6 | 73.4 | 74.13 | 63.3 |
| O₃ (ppm) | 0.0414 | 0.041767 | 0.031633 | 0.0211 | 0.022433 | 0.019767 | 0.019867 | 0.0229 | 0.028233 | 0.0303 | 0.033733 | 0.036067 | 0.043167 | 0.044433 | 0.0289 | 0.0206 | 0.021767 | 0.020067 | 0.0184 | 0.019533 | 0.023667 | 0.028333 | 0.029533 | 0.0294 | 0.0359 | 0.033267 | 0.0278 | 0.024 | 0.021633 | 0.01885 | 0.0259 | 0.0224 | 0.021767 | 0.0252 | 0.02945 | 0.03875 | 0.0445 | 0.040633 | 0.036 | 0.029033 | 0.02655 | 0.024233 | 0.0217 | 0.026867 | 0.028567 | 0.029333 | 0.036867 | 0.038533 | 0.0377 | 0.0365 | 0.028733 |
| SO₂ (ppm) | 0.006125 | 0.006045 | 0.00634 | 0.005565 | 0.00619 | 0.00641 | 0.00627 | 0.00605 | 0.005865 | 0.00673 | 0.00667 | 0.00804 | 0.00761 | 0.007565 | 0.009355 | 0.009655 | 0.009625 | 0.009925 | 0.0102 | 0.009625 | 0.0094 | 0.009335 | 0.0065 | 0.00626 | 0.005315 | 0.00643 | — | 0.00538 | 0.00857 | 0.0206 | 0.0104 | 0.00648 | 0.00638 | 0.011535 | 0.00755 | 0.00758 | 0.00591 | 0.006235 | 0.006865 | 0.00844 | 0.00909 | 0.008505 | 0.0039 | 0.00316 | 0.0029 | 0.00438 | 0.00562 | 0.012435 | 0.012635 | 0.0145 | 0.012595 |
| CO (ppm) | — | — | — | — | — | — | — | — | — | — | — | 0.872 | — | 1.19 | 1.23 | 1.03 | 1.29 | 1.35 | 0.673 | 0.458 | 0.479 | — | 2.236 | 0.770667 | 1.078 | 1.414 | 1.238333 | 0.960667 | 1.131333 | 1.207667 | 0.806 | 0.647 | 0.717 | 0.683667 | 1.413667 | 0.912 | 1.066667 | 0.964333 | 0.823667 | 0.956333 | 1.076 | 1.121333 | 1.050333 | 0.9625 | 0.607333 | 0.765 | 0.789 | 0.607333 | 0.657333 | 1.075 | 0.915 |
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 6
AIR QUALITY ARCHIVE · Estaci��n CICEG
Estaci��n CICEG
Station code: Estación CICEG
Monthly monitoring station data.
PM10Lowest 28.5 2020-05Highest 87.2 2017-122017-06 - 2020-05
O₃ (ppm)Lowest 0.0128 2017-12Highest 0.0483 2020-052017-06 - 2020-05
CO (ppm)Lowest 0.18 2017-08Highest 2.53 2018-042017-06 - 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM10 µg/m³ | 28.5 | 41.6 | 47 | 46.4 | 46.7 | 54.7 | 43.7 | 38.7 | 34.4 | 40.7 | 50.5 | 40.1 | 63.2 | 61.8 | 63.8 | 62.4 | 66.9 | 78.5 | 59.8 | 37.1 | 39.1 | 35.1 | 46.8 | 31.6 | 53.5 | 62.1 | 64.4 | 65.2 | 74.4 | 87.2 | 62.8 | 48.1 | 43.7 | 42.9 | 43.1 | 50.2 |
| O₃ (ppm) | 0.0483 | 0.0425 | 0.0329 | 0.022 | 0.0223 | 0.018 | 0.0184 | 0.0225 | 0.0276 | 0.0323 | 0.0388 | 0.0346 | 0.0379 | 0.042 | 0.0293 | 0.0229 | 0.0244 | 0.02 | 0.0176 | 0.0192 | 0.0249 | 0.0309 | 0.0312 | 0.0341 | 0.0427 | 0.0393 | 0.0336 | 0.0275 | 0.0228 | 0.0128 | 0.0287 | 0.0302 | 0.0287 | 0.0311 | 0.0309 | 0.0411 |
| CO (ppm) | — | — | — | — | — | — | — | — | — | — | — | 0.872 | — | 1.19 | 1.23 | 1.03 | 1.29 | 1.35 | 0.673 | 0.458 | 0.479 | — | 0.498 | 0.532 | — | 2.53 | 1.98 | 1.58 | 1.59 | 2.08 | — | — | — | 0.18 | 1.77 | 1.1 |
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 ↗AirNow
AIR QUALITY ARCHIVE · Estaci��n Facultad de
Estaci��n Facultad de
Station code: Estación Facultad de
Monthly monitoring station data.
PM2.5Lowest 12.3 2018-10Highest 31 2017-122017-06 - 2020-05
PM10Lowest 23.1 2019-10Highest 105 2017-122017-06 - 2020-05
O₃ (ppm)Lowest 0.0177 2019-02Highest 0.0509 2019-052017-06 - 2020-05
SO₂ (ppm)Lowest 0.00572 2017-06Highest 0.0148 2017-082017-06 - 2020-05
CO (ppm)Lowest 0.513 2018-02Highest 1.67 2017-082017-06 - 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 µg/m³ | — | — | 23.4 | 17 | 26.6 | 22.3 | 18.3 | 15.4 | 15.7 | 20.5 | 19.7 | 19.4 | 29.6 | 26 | 21.9 | 17.8 | 18.9 | 21.8 | 18 | 12.3 | — | 22.5 | 27.3 | 17.1 | 23.7 | 23.5 | 21.3 | 18.1 | 17.9 | 31 | — | 22.9 | — | 15.4 | — | 23 |
| PM10 µg/m³ | 24.4 | 34.9 | 38.8 | 33.6 | 30.1 | 38.1 | 25.3 | 23.1 | 24.1 | 26.3 | 31.7 | 45 | 70.9 | 66.8 | 66 | 59.2 | 53.5 | 59.8 | 48.6 | 45 | 52.5 | — | 70.3 | 52.4 | 69.6 | 84.6 | 81.2 | 62 | 83.4 | 105 | 84.3 | 61.4 | 50.5 | 52.2 | 54.1 | 65.6 |
| O₃ (ppm) | 0.0366 | 0.0426 | 0.0292 | 0.0232 | 0.0237 | 0.0221 | 0.0213 | 0.0227 | 0.0269 | 0.0341 | 0.0351 | 0.0367 | 0.0509 | 0.0494 | 0.0275 | 0.0177 | 0.0199 | 0.02 | 0.0191 | 0.0182 | 0.0203 | 0.0233 | 0.0256 | 0.0243 | 0.0291 | 0.0235 | 0.022 | 0.0205 | 0.0229 | 0.0249 | 0.0231 | 0.0202 | 0.0196 | 0.0248 | 0.028 | 0.0364 |
| SO₂ (ppm) | 0.00692 | 0.00644 | 0.00683 | 0.00707 | 0.00696 | 0.0071 | 0.00697 | 0.00665 | 0.00644 | 0.00673 | 0.00667 | 0.0063 | 0.00718 | 0.00713 | 0.00781 | 0.00771 | 0.00735 | 0.00745 | 0.0076 | 0.00685 | 0.0066 | 0.00667 | 0.00677 | 0.00622 | 0.00603 | 0.00643 | — | — | — | — | — | — | — | 0.0148 | — | 0.00572 |
| CO (ppm) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1.15 | 0.871 | 1.35 | 1.26 | 1.24 | 0.513 | 1.06 | 0.865 | 0.806 | 0.647 | 0.717 | 1.67 | 1.58 | 1.4 |
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 · Estaci��n T21
Estaci��n T21
Station code: Estación T21
Monthly monitoring station data.
PM10Lowest 28.6 2018-06Highest 71.5 2017-122017-06 - 2020-05
O₃ (ppm)Lowest 0.0168 2017-10Highest 0.0419 2019-042017-06 - 2020-05
SO₂ (ppm)Lowest 0.00406 2020-02Highest 0.0206 2017-122017-06 - 2020-05
CO (ppm)Lowest 0.201 2017-08Highest 5.06 2018-072017-06 - 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM10 µg/m³ | 35 | 42.9 | 49.2 | 39.2 | 45.4 | 49.9 | 30.3 | 31 | 30.4 | 35.2 | 32.6 | 30.3 | 57.9 | 61.1 | 57.9 | 54.8 | 53.7 | 60 | 45.7 | 30.1 | 31.9 | 34.8 | 43.4 | 28.6 | 46.5 | 52 | 54 | 43.5 | 57 | 71.5 | 58.9 | 39.1 | 34.7 | 37 | 36.2 | 44.4 |
| O₃ (ppm) | 0.0393 | 0.0402 | 0.0328 | 0.0181 | 0.0213 | 0.0192 | 0.0199 | 0.0235 | 0.0302 | 0.0245 | 0.0273 | 0.0369 | 0.0407 | 0.0419 | 0.0299 | 0.0212 | 0.021 | 0.0202 | 0.0185 | 0.0212 | 0.0258 | 0.0308 | 0.0318 | 0.0298 | — | 0.037 | — | — | 0.0192 | — | — | 0.0168 | 0.017 | 0.0197 | — | — |
| SO₂ (ppm) | 0.00533 | 0.00565 | 0.00585 | 0.00406 | 0.00542 | 0.00572 | 0.00557 | 0.00545 | 0.00529 | — | — | 0.00978 | 0.00804 | 0.008 | 0.0109 | 0.0116 | 0.0119 | 0.0124 | 0.0128 | 0.0124 | 0.0122 | 0.012 | 0.00623 | 0.0063 | 0.0046 | — | — | 0.00538 | 0.00857 | 0.0206 | 0.0104 | 0.00648 | 0.00638 | 0.00827 | 0.00755 | 0.00944 |
| CO (ppm) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 5.06 | 0.909 | 0.806 | 0.452 | 0.495 | 0.789 | 0.744 | 0.678 | — | — | — | 0.201 | 0.891 | 0.236 |
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 · Estaci�n CICEG
Estaci�n CICEG
Station code: Estaci�n CICEG
Monthly monitoring station data.
PM10Lowest 39.8 2016-08Highest 96.9 2016-042016-03 - 2017-05
O₃ (ppm)Lowest 0.0226 2016-11Highest 0.0431 2017-052016-03 - 2017-05
CO (ppm)Lowest 0.482 2016-06Highest 1.44 2016-042016-03 - 2017-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM10 µg/m³ | 81.9 | 71 | 64.5 | 75.9 | 94 | 90.7 | 62.1 | 57.9 | 51.9 | 39.8 | 41.2 | 50.2 | 94.7 | 96.9 | 78.2 |
| O₃ (ppm) | 0.0431 | 0.0371 | 0.0343 | 0.0284 | — | 0.0255 | 0.0226 | 0.0296 | 0.0276 | 0.0282 | 0.0364 | 0.0395 | 0.0408 | 0.0356 | 0.0295 |
| CO (ppm) | 1.17 | 0.93 | 0.849 | 1.02 | 1.16 | 1.19 | 1.19 | 0.992 | 0.756 | — | — | 0.482 | 0.677 | 1.44 | 1.37 |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
AIR QUALITY ARCHIVE · Estaci�n Facultad de
Estaci�n Facultad de
Station code: Estaci�n Facultad de
Monthly monitoring station data.
PM2.5Lowest 14.1 2016-10Highest 43.8 2016-042016-03 - 2017-05
PM10Lowest 29.5 2016-06Highest 101 2017-052016-03 - 2017-05
O₃ (ppm)Lowest 0.0212 2016-11Highest 0.0418 2017-052016-03 - 2017-05
SO₂ (ppm)Lowest 0.0029 2016-09Highest 0.0109 2016-042016-03 - 2017-05
CO (ppm)Lowest 0.762 2016-03Highest 1.46 2017-052016-03 - 2017-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 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 | 43.3 | 29.6 | 21.3 | 25.8 | 38.4 | 30.3 | 17.4 | 14.1 | 19.6 | 19.2 | 38.1 | 31.1 | 38.3 | 43.8 | 30 |
| PM10 µg/m³ | 101 | 80.3 | 74.8 | 82.9 | 93.4 | 81.5 | 65.2 | 55.5 | 54.2 | 46.8 | 37.4 | 29.5 | 75.3 | 72.3 | 44 |
| O₃ (ppm) | 0.0418 | 0.0416 | 0.0366 | 0.0306 | 0.0278 | 0.0247 | 0.0212 | 0.0222 | 0.0279 | 0.0329 | 0.04 | 0.0374 | 0.0312 | 0.0377 | 0.0288 |
| SO₂ (ppm) | 0.00657 | 0.0064 | 0.0072 | 0.00678 | 0.00648 | 0.00671 | 0.0039 | 0.00316 | 0.0029 | 0.00438 | 0.00562 | 0.00657 | 0.00887 | 0.0109 | 0.00989 |
| CO (ppm) | 1.46 | 1.36 | 1.21 | 1.03 | 1.19 | 1.2 | 1.05 | 0.933 | 0.877 | 1.13 | 1.04 | 1.04 | 0.906 | 1.16 | 0.762 |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
AIR QUALITY ARCHIVE · Estaci�n T21
Estaci�n T21
Station code: Estaci�n T21
Monthly monitoring station data.
PM10Lowest 30.1 2016-06Highest 78.9 2017-012016-03 - 2017-05
O₃ (ppm)Lowest 0.0213 2016-11Highest 0.0486 2017-052016-03 - 2017-05
SO₂ (ppm)Lowest 0.00525 2017-05Highest 0.0183 2016-062016-03 - 2017-05
CO (ppm)Lowest 0.189 2016-09Highest 0.974 2016-122016-03 - 2017-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM10 µg/m³ | 75.3 | 61.9 | 58.1 | 73 | 78.9 | 64.8 | 44.5 | 42 | 36.7 | 30.9 | 39.9 | 30.1 | 50.2 | 53.2 | 67.7 |
| O₃ (ppm) | 0.0486 | 0.0432 | 0.0371 | 0.0281 | 0.0253 | 0.0225 | 0.0213 | 0.0288 | 0.0302 | 0.0269 | 0.0342 | 0.0387 | 0.0411 | 0.0362 | 0.0279 |
| SO₂ (ppm) | 0.00525 | 0.00607 | 0.00653 | 0.0101 | 0.0117 | 0.0103 | — | — | — | — | — | 0.0183 | 0.0164 | 0.0181 | 0.0153 |
| CO (ppm) | 0.57 | 0.603 | 0.412 | 0.819 | 0.878 | 0.974 | 0.911 | — | 0.189 | 0.4 | 0.538 | 0.3 | 0.389 | 0.625 | 0.613 |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
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WEATHER & SURROUNDINGS
León · weather forecast
Daily maximum and minimum temperatures. Forecast point: 12.4379, -86.878.
Scroll the forecast to see the following days.
León · October 20, 2026: minimum temperature 23°C, maximum 30.2°C. Wind: 8.6 km/h. Humidity: 67%.
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 | 29.9 | 23 | 30.2 | 24.5 | 2.5 | 2.4 | 67 | 79 |
| 2026-10-21 | 30.1 | 22.8 | 30.5 | 24.7 | 2.3 | 2.7 | 62 | 98 |
| 2026-10-22 | 29.5 | 22.5 | 30.8 | 23.8 | 0.5 | 2.7 | 60 | 35 |
| 2026-10-23 | 29.2 | 22.3 | 31.6 | 25 | 0.9 | 2.9 | 62 | 69 |
| 2026-10-24 | 31.7 | 23.3 | 32.3 | 25.5 | 1.4 | 2.1 | 58 | 99 |
| 2026-10-25 | 30.8 | 22.9 | 30.8 | 24.7 | 12.1 | 2.6 | 63 | 84 |
| 2026-10-26 | 30.9 | 21.5 | 30.9 | 24.1 | 31.4 | 4.8 | 63 | 94 |
| 2026-10-27 | 31.2 | 22.5 | 31.2 | 24 | 2.2 | 2 | 57 | 17 |
| 2026-10-28 | 30.4 | 23 | 30.4 | 23.8 | 9.5 | 2 | 63 | 69 |
| 2026-10-29 | 30.3 | 22.9 | 30.3 | 24.1 | 5.6 | 1.7 | 65 | 81 |
| 2026-10-30 | 30.2 | 22.5 | 30.2 | 24 | 2.6 | 1.9 | 64 | 93 |
| 2026-10-31 | 30.1 | 22.8 | 30.1 | 23.7 | 6.3 | 1.9 | 64 | 23 |
| 2026-11-01 | 30.7 | 22.8 | 30.7 | 24.3 | 1.7 | 1.7 | 62 | 68 |
| 2026-11-02 | 30.8 | 22.9 | 30.8 | 24.4 | 0.8 | 1.8 | 60 | 20 |
| 2026-11-03 | 30.9 | 22.7 | 30.9 | 24.4 | 0.6 | 2.2 | 59 | 64 |
| 2026-11-04 | 30 | 22 | 30.5 | 23.8 | 0.6 | 2.4 | 58 | 5 |
| 2026-11-05 | 30.5 | 22.3 | 30.5 | 24 | 1 | 1.5 | 57 | 2 |
UV index by day · León
City data.
SPF 50, long sleeves and shade between 10:00-16:00.
0-2 low3-5 moderate6-7 high8-10 very high11+ extreme
Scroll the forecast to see the following days.
León · October 22, 2026: UV index: 8.3 .
| 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 | 8.3 | 8.4 | 3.5 | 8.1 | 7.5 | 7.8 | 8 | 8 | 7.8 | 7.8 | 7.8 | 7.7 | 7.8 | 7.3 | 7.7 | — |
AIR QUALITY QUESTIONS
León · air pollution - questions and answers
What do the latest air quality data show for León?
León - latest available concentrations (October 22, 2026, 19:00 local time): PM2.5: 1.7 µg/m³, PM10: 2 µg/m³, O₃: 69 µg/m³, NO₂: 5.5 µg/m³, SO₂: 1.3 µg/m³, CO: 161 µg/m³. These are hourly CAMS model values for a point representing the city.
When was PM2.5 highest in León over the past week?
The highest available daily mean PM2.5 was 6.9 µg/m³ (October 15, 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 León cover?
Available monthly means cover 2016-03 - 2020-05. The tables include PM2.5, PM10, O₃ (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 León 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 León?
For October 22, 2026, the forecast UV index is 8.3. The UV section also shows the following available days.
What wind speed is forecast for León?
For October 20, 2026, forecast wind speed is 8.6 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.