Fine particles
6.1µg/m³Fair · 1 hourCAMS model • Open-Meteo
TalcahuanoAir 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.
Talcahuano - latest available concentrations (September 25, 2026, 22:00 local time): PM2.5: 6.1 µg/m³, PM10: 9.5 µg/m³, O₃: 38 µg/m³, NO₂: 3.8 µg/m³, SO₂: 2.8 µg/m³, CO: 196 µg/m³. These are hourly CAMS model values for a point representing the city.
Air quality questions →Talcahuano · Air pollutant concentrations
Data time: September 25, 2026 · 22:00 · local timeParticulate matter
9.5µg/m³Good · 1 hourOzone
38µg/m³Good · 1 hourNitrogen dioxide
3.8µg/m³Good · 1 hourSulphur dioxide
2.8µg/m³Good · 1 hourCarbon monoxide
196µg/m³PM2.5 vs PM10 - what is the difference? → · Models and monitoring stations →
DAILY DATA · Talcahuano
Talcahuano - air pollution over recent days (2026-08-30 - 2026-09-24)
Concentrations of all available pollutants for this city.
PM2.5Lowest 2.87 2026-09-05Highest 9.88 2026-09-012026-08-30 - 2026-09-24
PM10Lowest 3.78 2026-09-05Highest 15.4 2026-09-202026-08-30 - 2026-09-24
O₃Lowest 43.5 2026-09-01Highest 57.5 2026-09-202026-08-30 - 2026-09-24
NO₂Lowest 0.64 2026-09-20Highest 8.34 2026-09-012026-08-30 - 2026-09-24
SO₂Lowest 0.9 2026-09-24Highest 6.63 2026-09-012026-08-30 - 2026-09-24
COLowest 72.83 2026-09-20Highest 319.67 2026-09-012026-08-30 - 2026-09-24
Scroll the chart or table sideways to see the full period.
| Pollutant | 2026-09-24 | 2026-09-23 | 2026-09-22 | 2026-09-21 | 2026-09-20 | 2026-09-19 | 2026-09-18 | 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 | 6.9 | 9.6 | 8.23 | 7.05 | 9.1 | 7.23 | 7.99 | 6.22 | 2.87 | 3.69 | 5.12 | 6.42 | 9.88 | 5.57 | 6.48 |
| PM10 | 11.29 | 15.2 | 11.37 | 10.85 | 15.4 | 10.65 | 9.95 | 8.1 | 3.78 | 5.24 | 7.4 | 9.91 | 12.99 | 8.52 | 9.68 |
| O₃ | 50.75 | 46.08 | 44.54 | 53.58 | 57.5 | 52.17 | 45.54 | 48.42 | 46.21 | 50.04 | 53.42 | 49.88 | 43.5 | 54.25 | 50.21 |
| NO₂ | 1.21 | 3.09 | 4.28 | 2.31 | 0.64 | 2.73 | 5.52 | 3.05 | 1.68 | 2.48 | 3.47 | 3.38 | 8.34 | 3.41 | 2.89 |
| SO₂ | 0.9 | 2.16 | 3.35 | 2.54 | 1.02 | 2.21 | 3.33 | 2.63 | 1.26 | 1.57 | 3.07 | 3.03 | 6.63 | 3.25 | 3.24 |
| CO | 76.54 | 104.54 | 167.08 | 154.54 | 72.83 | 82.46 | 259.04 | 115.42 | 99.13 | 152.75 | 162.63 | 107.42 | 319.67 | 148.13 | 107.75 |
A dot on the chart and a dash in the table indicate missing data. The latest day may be incomplete.
AIR QUALITY ARCHIVE · Talcahuano
Talcahuano - air pollution history (2015-09 - 2020-05)
Compare monthly particle and gas concentrations in the available archive.
PM2.5Lowest 10.5 2015-09Highest 47.8 2016-062015-09 - 2020-05
PM10Lowest 26.8 2015-09Highest 76 2018-072015-09 - 2020-05
NO₂Lowest 1.91 2018-02Highest 23 2016-062015-09 - 2020-05
SO₂Lowest 5.65 2019-06Highest 41.5 2017-112015-09 - 2020-05
COLowest 1 2015-09Highest 2 2016-062015-09 - 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 | 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 | 2016-02 | 2016-01 | 2015-12 | 2015-11 | 2015-10 | 2015-09 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 | 22.2 | 16.3 | 15.2 | 16.3 | 19.3 | 16.8 | 17 | 15.1 | 17.3 | 23.4 | 28.4 | 31.9 | 28.9 | 23.4 | 19 | 23.4 | 18 | — | 13.2 | 12.6 | 16.2 | 29.1 | 44 | 35.9 | 27.5 | 22.5 | 17.7 | 17.3 | 18 | 16.8 | 14.5 | 12.6 | 16.4 | 27.8 | 23.2 | 30.1 | 26.8 | 17.9 | 15.3 | 14.4 | 19.3 | 15 | 16.1 | 14.7 | 17.5 | 26.7 | 26 | 47.8 | 25.7 | 19.8 | 18.6 | 18.1 | 16.1 | 15.7 | 14.3 | 13.5 | 10.5 |
| PM10 | 58.2 | 45.4 | 51.1 | 66.4 | 72.7 | 74.2 | 59.4 | 47.4 | 48.6 | 57.4 | 61.3 | 61.5 | 67.1 | 62.9 | 62.2 | 65.3 | 60.5 | — | 41.8 | 40.6 | 48.4 | 68.1 | 76 | 60.9 | 58.1 | 54.9 | 54.6 | 54.3 | 64.5 | 58.3 | 53.7 | 40.2 | 46.2 | 53.7 | 44.3 | 49.2 | 50.5 | 44.9 | 46.9 | 53.7 | 71.8 | 47.4 | 57.1 | 41 | 55.4 | 53.8 | 41.6 | 74 | 41.9 | 48.2 | 65.3 | 71.7 | 55.6 | 58.4 | 52.1 | 48.1 | 26.8 |
| NO₂ | 3.79 | 3.58 | 3.52 | 3.31 | 3.91 | 4.05 | 4.36 | 4.97 | 5.66 | 7.69 | 6.82 | 8.41 | 5.87 | 5.74 | 4.69 | 3.77 | 3.9 | — | 4.73 | 7.51 | 4.64 | 8.95 | 10.3 | 13.9 | 14.2 | 12.5 | 4.45 | 1.91 | 2.01 | 2.81 | 4.11 | 9.44 | 16.1 | 18.3 | 19.6 | 21.7 | 21.4 | 18 | 17.4 | 12.4 | 7.98 | 9.97 | 12.9 | 14.7 | 17.4 | 22 | 19 | 23 | 20.2 | 20.7 | 14.7 | 9.27 | 11.9 | 7.69 | 9.83 | 13.9 | 14.2 |
| SO₂ | 20.3 | 15.4 | 20.3 | 18.9 | 13.4 | 20.3 | 16.2 | 12.7 | 11.9 | 9.41 | 10 | 5.65 | 7.54 | 14.1 | 27.5 | 17.1 | 16.5 | — | 18.8 | 19.8 | 16.6 | 17.6 | 16 | 12 | 10.8 | 12.3 | 15.1 | 22.5 | 23.9 | 28.5 | 41.5 | 37.6 | 22.8 | 22.2 | 14.4 | 15.2 | 21.2 | 15.9 | 13.7 | 13.7 | 20.2 | 19.2 | 21.2 | 13.8 | 11 | 8.55 | 6.92 | 6.02 | 6.08 | 10.9 | 11.3 | 27.7 | 16.7 | 25.2 | 20.9 | 15.7 | 9.49 |
| CO | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | — | 1 | 1 | 2 | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 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.
Historical data by station 1
AIR QUALITY ARCHIVE · Nueva Libertad
Nueva Libertad
Station code: Nueva Libertad
Monthly monitoring station data.
PM2.5Lowest 10.5 2015-09Highest 47.8 2016-062015-09 - 2020-05
PM10Lowest 26.8 2015-09Highest 76 2018-072015-09 - 2020-05
NO₂Lowest 1.91 2018-02Highest 23 2016-062015-09 - 2020-05
SO₂Lowest 5.65 2019-06Highest 41.5 2017-112015-09 - 2020-05
COLowest 1 2015-09Highest 2 2016-062015-09 - 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 | 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 | 2016-02 | 2016-01 | 2015-12 | 2015-11 | 2015-10 | 2015-09 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 | 22.2 | 16.3 | 15.2 | 16.3 | 19.3 | 16.8 | 17 | 15.1 | 17.3 | 23.4 | 28.4 | 31.9 | 28.9 | 23.4 | 19 | 23.4 | 18 | — | 13.2 | 12.6 | 16.2 | 29.1 | 44 | 35.9 | 27.5 | 22.5 | 17.7 | 17.3 | 18 | 16.8 | 14.5 | 12.6 | 16.4 | 27.8 | 23.2 | 30.1 | 26.8 | 17.9 | 15.3 | 14.4 | 19.3 | 15 | 16.1 | 14.7 | 17.5 | 26.7 | 26 | 47.8 | 25.7 | 19.8 | 18.6 | 18.1 | 16.1 | 15.7 | 14.3 | 13.5 | 10.5 |
| PM10 | 58.2 | 45.4 | 51.1 | 66.4 | 72.7 | 74.2 | 59.4 | 47.4 | 48.6 | 57.4 | 61.3 | 61.5 | 67.1 | 62.9 | 62.2 | 65.3 | 60.5 | — | 41.8 | 40.6 | 48.4 | 68.1 | 76 | 60.9 | 58.1 | 54.9 | 54.6 | 54.3 | 64.5 | 58.3 | 53.7 | 40.2 | 46.2 | 53.7 | 44.3 | 49.2 | 50.5 | 44.9 | 46.9 | 53.7 | 71.8 | 47.4 | 57.1 | 41 | 55.4 | 53.8 | 41.6 | 74 | 41.9 | 48.2 | 65.3 | 71.7 | 55.6 | 58.4 | 52.1 | 48.1 | 26.8 |
| NO₂ | 3.79 | 3.58 | 3.52 | 3.31 | 3.91 | 4.05 | 4.36 | 4.97 | 5.66 | 7.69 | 6.82 | 8.41 | 5.87 | 5.74 | 4.69 | 3.77 | 3.9 | — | 4.73 | 7.51 | 4.64 | 8.95 | 10.3 | 13.9 | 14.2 | 12.5 | 4.45 | 1.91 | 2.01 | 2.81 | 4.11 | 9.44 | 16.1 | 18.3 | 19.6 | 21.7 | 21.4 | 18 | 17.4 | 12.4 | 7.98 | 9.97 | 12.9 | 14.7 | 17.4 | 22 | 19 | 23 | 20.2 | 20.7 | 14.7 | 9.27 | 11.9 | 7.69 | 9.83 | 13.9 | 14.2 |
| SO₂ | 20.3 | 15.4 | 20.3 | 18.9 | 13.4 | 20.3 | 16.2 | 12.7 | 11.9 | 9.41 | 10 | 5.65 | 7.54 | 14.1 | 27.5 | 17.1 | 16.5 | — | 18.8 | 19.8 | 16.6 | 17.6 | 16 | 12 | 10.8 | 12.3 | 15.1 | 22.5 | 23.9 | 28.5 | 41.5 | 37.6 | 22.8 | 22.2 | 14.4 | 15.2 | 21.2 | 15.9 | 13.7 | 13.7 | 20.2 | 19.2 | 21.2 | 13.8 | 11 | 8.55 | 6.92 | 6.02 | 6.08 | 10.9 | 11.3 | 27.7 | 16.7 | 25.2 | 20.9 | 15.7 | 9.49 |
| CO | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | — | 1 | 1 | 2 | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 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 ↗Chile - SINCA
Environment and quality of life ratings · Talcahuano
Archived ratings of the local environment: green spaces, cleanliness, noise and water quality. Opinion indicators are separate from pollutant concentration measurements.
| Indicator | Talcahuano | Argentina | Uruguay | Paraguay | Bolivia | Montenegro |
|---|---|---|---|---|---|---|
| Green and Parks in the City | 38% | 65% | 65% | 46% | 55% | 53% |
| particulate matter PM2.5 (µg/m³) | 25 | — | — | — | — | — |
| Pleasure of spending time in the city | 44% | 64% | 67% | 49% | 40% | 69% |
| particulate matter PM10 (µg/m³) | 49 | — | — | — | — | — |
| Air Pollution | 67% | 42% | 29% | 56% | 64% | 40% |
| Garbage Disposal | 50% | 48% | 34% | 30% | 34% | 42% |
| Availability and quality of drinking water | 100% | 69% | 73% | 57% | 50% | 71% |
| Cleanliness and tidiness | 38% | 43% | 38% | 26% | 32% | 51% |
| Noise and Light pollution | 0% | 53% | 48% | 52% | 59% | 32% |
| Water Pollution | 0% | 55% | 46% | 65% | 66% | 38% |
Air quality in nearby cities
All cities →Chile↗
Chillán
PM2.55.8
PM107.2
µg/m³
PM2.5 · FairNO₂ 8.4O₃ 35
September 25, 202622:00
Chile↗
Talca
PM2.513.1
PM1014.2
µg/m³
PM2.5 · FairNO₂ 23.2O₃ 15
September 25, 202622:00
Chile↗
Temuco
PM2.57.7
PM108.4
µg/m³
PM2.5 · FairNO₂ 14.9O₃ 19
September 25, 202622:00
Chile↗
Rancagua
PM2.527
PM1027.7
µg/m³
PM2.5 · ModerateNO₂ 20.3O₃ 65
September 25, 202622:00
Chile↗
Santiago
PM2.545.8
PM1046.6
µg/m³
PM2.5 · ModerateNO₂ 81.7O₃ 10
September 25, 202622:00
Chile↗
Osorno
PM2.52.9
PM104.4
µg/m³
PM2.5 · GoodNO₂ 2.6O₃ 31
September 25, 202622:00
Chile↗
Concepción
PM2.56.1
PM109.5
µg/m³
PM2.5 · FairNO₂ 3.8O₃ 38
September 25, 202622:00
Chile↗
Los Ángeles
PM2.55.9
PM107.2
µg/m³
PM2.5 · FairNO₂ 7.4O₃ 29
September 25, 202622:00
Chile · air quality in other cities
WEATHER & SURROUNDINGS
Chile · weather forecast
Daily maximum and minimum temperatures. Forecast point: -30, -71. Forecast for a country reference point; conditions in the city may differ.
Scroll the forecast to see the following days.
Chile · September 23, 2026: minimum temperature 9.9°C, maximum 22.6°C. Wind: 9.8 km/h. Humidity: 62%.
Full forecast: temperature, rainfall, wind and humidity
| Date | Day °C | Min °C | Max °C | Night °C | Rain mm | Wind m/s | Humidity % | Clouds % |
|---|---|---|---|---|---|---|---|---|
| 2026-09-23 | 21.5 | 9.9 | 22.6 | 13 | — | 2.7 | 62 | 100 |
| 2026-09-24 | 22.4 | 11.6 | 22.7 | 13 | — | 3.5 | 57 | 97 |
| 2026-09-25 | 23.7 | 11.6 | 24.4 | 15.7 | — | 3.9 | 22 | 8 |
| 2026-09-26 | 23 | 12.2 | 27.5 | 21.9 | — | 3.7 | 25 | 75 |
| 2026-09-27 | 26.1 | 18.7 | 27.1 | 19.7 | — | 4.1 | 34 | 40 |
| 2026-09-28 | 22.3 | 17 | 23.1 | 17 | — | 4.2 | 41 | 100 |
| 2026-09-29 | 24.1 | 15.3 | 24.5 | 17.7 | 0.1 | 4.5 | 39 | 100 |
| 2026-09-30 | 21.5 | 14.7 | 26.2 | 19.9 | 7.3 | 3.4 | 47 | 92 |
| 2026-10-01 | 28.9 | 18.8 | 30.7 | 22.5 | 1 | 4 | 25 | 97 |
| 2026-10-02 | 22.5 | 15.2 | 22.5 | 15.2 | 0.7 | 4.7 | 42 | 100 |
| 2026-10-03 | 16.2 | 12.2 | 19.8 | 14.3 | 0.8 | 4.9 | 57 | 25 |
| 2026-10-04 | 20.2 | 13.1 | 22.3 | 17 | — | 3.3 | 31 | 100 |
| 2026-10-05 | 19.6 | 14.6 | 23 | 18.2 | — | 3.1 | 41 | 100 |
| 2026-10-06 | 22.7 | 15.2 | 24.9 | 18.3 | — | 4.1 | 29 | 100 |
| 2026-10-07 | 22.1 | 13.7 | 24 | 18.5 | — | 4.3 | 29 | 73 |
| 2026-10-08 | 22.6 | 18 | 25.5 | 19 | — | 2.9 | 26 | 100 |
| 2026-10-09 | 24.3 | 18.1 | 25.8 | 19.5 | — | 4.3 | 24 | 89 |
UV index by day · Chile
Data for a country reference point. Local conditions may differ.
SPF 30-50, hat and sunglasses are a must. Better to stay in the shade 11:00-15:00.
0-2 low3-5 moderate6-7 high8-10 very high11+ extreme
Scroll the forecast to see the following days.
Chile · September 25, 2026: UV index: 7.9 .
| Indicator | 2026-09-25 | 2026-09-26 | 2026-09-27 | 2026-09-28 | 2026-09-29 | 2026-09-30 | 2026-10-01 | 2026-10-02 | 2026-10-03 | 2026-10-04 | 2026-10-05 | 2026-10-06 | 2026-10-07 | 2026-10-08 | 2026-10-09 | 2026-10-10 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index | 7.9 | 7.6 | 8 | 8 | 7.9 | 7.3 | 8.1 | 7.3 | 8 | 4.2 | 6.7 | 7.6 | 8.1 | 6.2 | 7.7 | — |
AIR QUALITY QUESTIONS
Talcahuano · air pollution - questions and answers
What do the latest air quality data show for Talcahuano?
Talcahuano - latest available concentrations (September 25, 2026, 22:00 local time): PM2.5: 6.1 µg/m³, PM10: 9.5 µg/m³, O₃: 38 µg/m³, NO₂: 3.8 µg/m³, SO₂: 2.8 µg/m³, CO: 196 µg/m³. These are hourly CAMS model values for a point representing the city.
When was PM2.5 highest in Talcahuano over the past week?
The highest available daily mean PM2.5 was 9.6 µg/m³ (September 23, 2026). This comparison covers 7 days with data in the seven days before September 25, 2026. The day of the latest reading is excluded because it may be incomplete.
What period does the pollution history for Talcahuano cover?
Available monthly means cover 2015-09 - 2020-05. The tables include PM2.5, PM10, 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 Talcahuano 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 Talcahuano?
For September 25, 2026, the forecast UV index is 7.9. The UV section also shows the following available days. The forecast is for a country reference point (Chile), not the city itself.
What wind speed is forecast for Talcahuano?
For September 23, 2026, forecast wind speed is 9.8 km/h. The weather table includes wind, temperature and other available parameters for subsequent days. These data describe a country reference point (Chile); local wind may differ.
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.