Fine particles
11.9µg/m³Fair · 1 hourCAMS model • Open-Meteo
CoimbraAir 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.
Coimbra - latest available concentrations (September 27, 2026, 02:00 local time): PM2.5: 11.9 µg/m³, PM10: 20.6 µg/m³, O₃: 42 µg/m³, NO₂: 15.3 µg/m³, SO₂: 2.6 µg/m³, CO: 162 µg/m³. These are hourly CAMS model values for a point representing the city.
Air quality questions →
1 weather warning in effect for Portugal
Coimbra · Air pollutant concentrations
Data time: September 27, 2026 · 02:00 · local timeParticulate matter
20.6µg/m³Fair · 1 hourOzone
42µg/m³Good · 1 hourNitrogen dioxide
15.3µg/m³Fair · 1 hourSulphur dioxide
2.6µg/m³Good · 1 hourCarbon monoxide
162µg/m³PM2.5 vs PM10 - what is the difference? → · Models and monitoring stations →
DAILY DATA · Coimbra
Coimbra - air pollution over recent days (2026-08-31 - 2026-09-26)
Concentrations of all available pollutants for this city.
PM2.5Lowest 7.68 2026-09-20Highest 17.48 2026-09-052026-08-31 - 2026-09-26
PM10Lowest 10.69 2026-09-20Highest 32.29 2026-09-052026-08-31 - 2026-09-26
O₃Lowest 51.29 2026-09-07Highest 85.25 2026-09-032026-08-31 - 2026-09-26
NO₂Lowest 6.4 2026-09-20Highest 13.29 2026-09-232026-08-31 - 2026-09-26
SO₂Lowest 1.17 2026-09-20Highest 3.41 2026-09-232026-08-31 - 2026-09-26
COLowest 122.42 2026-09-07Highest 201.29 2026-09-232026-08-31 - 2026-09-26
Scroll the chart or table sideways to see the full period.
| Pollutant | 2026-09-26 | 2026-09-25 | 2026-09-24 | 2026-09-23 | 2026-09-22 | 2026-09-21 | 2026-09-20 | 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 | 13.2 | 13.91 | 13.31 | 14.43 | 10.43 | 7.7 | 7.68 | 9.03 | 15 | 17.48 | 16.59 | 14.64 | 13.87 | 10.36 | 7.8 |
| PM10 | 19.46 | 20.07 | 20.36 | 18.29 | 14.15 | 11.56 | 10.69 | 13.93 | 27.69 | 32.29 | 24.38 | 18.97 | 19.16 | 15.35 | 12.23 |
| O₃ | 62.67 | 70.33 | 66.13 | 73.46 | 76.38 | 73.54 | 69 | 51.29 | 61.42 | 70.67 | 75.71 | 85.25 | 72.25 | 62.21 | 62.25 |
| NO₂ | 10.77 | 9.92 | 12.69 | 13.29 | 9.44 | 7.4 | 6.4 | 7.23 | 8.71 | 10.49 | 12.08 | 11.75 | 9.95 | 8.33 | 6.92 |
| SO₂ | 2.48 | 2.2 | 2.94 | 3.41 | 1.99 | 1.44 | 1.17 | 2.04 | 2.19 | 2.54 | 2.35 | 2.29 | 2.59 | 1.99 | 1.58 |
| CO | 174.33 | 180 | 188.67 | 201.29 | 174.67 | 159.5 | 157.08 | 122.42 | 138.5 | 161.25 | 178.42 | 180.29 | 167.29 | 158.13 | 157.38 |
A dot on the chart and a dash in the table indicate missing data. The latest day may be incomplete.
AIR QUALITY ARCHIVE · Coimbra
Coimbra - air pollution history (2017-09 - 2020-05)
Compare monthly particle and gas concentrations in the available archive.
PM10Lowest 4.69 2018-11Highest 28 2017-102017-09 - 2020-05
O₃Lowest 29.4 2018-12Highest 66.2 2018-052017-09 - 2020-05
NO₂Lowest 9.04 2018-07Highest 23.7 2017-102017-09 - 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM10 | 12.8 | 11.1 | 18.7 | 19.4 | 19.6 | 16.4 | 15.3 | 15.3 | 18 | 16.9 | 18.6 | 13.2 | 12.7 | 12.2 | 15.8 | 23.2 | 18.3 | 7.05 | 4.69 | 8.96 | 21.7 | 21.7 | 13.7 | 11.5 | 16.7 | 17.7 | 10.1 | 16.8 | 17.2 | 9.23 | — | 28 | 12.9 |
| O₃ | 49.7 | 58.7 | 56.3 | 36.7 | 37.6 | 38.4 | 40.8 | 40 | 52.8 | 50.7 | 50.4 | 52 | 55.6 | 54.8 | 54.8 | 43.2 | 34.7 | 29.4 | 43.1 | 52.3 | 54.1 | 61.1 | 52.6 | 59.4 | 66.2 | 59.8 | 63.7 | 40.6 | 32.4 | 45 | — | 40.9 | 39 |
| NO₂ | — | — | — | — | — | — | — | — | — | — | 10.2 | 11.1 | 11.5 | 11.8 | 14.5 | 22.3 | 21.3 | 19 | 9.5 | 10.1 | 18.9 | 14.7 | 9.04 | 9.81 | 13.5 | 13.9 | 13.3 | 23.1 | 20.8 | 13.5 | — | 23.7 | 17.6 |
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 · PT02016
PT02016
Station code: PT02016
Monthly monitoring station data.
PM10Lowest 4.69 2018-11Highest 28 2017-102017-09 - 2020-05
O₃Lowest 29.4 2018-12Highest 66.2 2018-052017-09 - 2020-05
NO₂Lowest 9.04 2018-07Highest 23.7 2017-102017-09 - 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM10 | 12.8 | 11.1 | 18.7 | 19.4 | 19.6 | 16.4 | 15.3 | 15.3 | 18 | 16.9 | 18.6 | 13.2 | 12.7 | 12.2 | 15.8 | 23.2 | 18.3 | 7.05 | 4.69 | 8.96 | 21.7 | 21.7 | 13.7 | 11.5 | 16.7 | 17.7 | 10.1 | 16.8 | 17.2 | 9.23 | — | 28 | 12.9 |
| O₃ | 49.7 | 58.7 | 56.3 | 36.7 | 37.6 | 38.4 | 40.8 | 40 | 52.8 | 50.7 | 50.4 | 52 | 55.6 | 54.8 | 54.8 | 43.2 | 34.7 | 29.4 | 43.1 | 52.3 | 54.1 | 61.1 | 52.6 | 59.4 | 66.2 | 59.8 | 63.7 | 40.6 | 32.4 | 45 | — | 40.9 | 39 |
| NO₂ | — | — | — | — | — | — | — | — | — | — | 10.2 | 11.1 | 11.5 | 11.8 | 14.5 | 22.3 | 21.3 | 19 | 9.5 | 10.1 | 18.9 | 14.7 | 9.04 | 9.81 | 13.5 | 13.9 | 13.3 | 23.1 | 20.8 | 13.5 | — | 23.7 | 17.6 |
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 Portugal
Environment and quality of life ratings · Coimbra
Archived ratings of the local environment: green spaces, cleanliness, noise and water quality. Opinion indicators are separate from pollutant concentration measurements.
| Indicator | Coimbra | Morocco | Andorra | Spain | France | Western Sahara |
|---|---|---|---|---|---|---|
| Green and Parks in the City | 73% | 41% | 69% | 70% | 61% | — |
| particulate matter PM2.5 (µg/m³) | 12 | — | — | — | — | — |
| Pleasure of spending time in the city | 85% | 41% | 84% | 76% | 68% | — |
| particulate matter PM10 (µg/m³) | 17 | — | — | — | — | — |
| Air Pollution | 22% | 63% | 29% | 30% | 36% | — |
| Garbage Disposal | 64% | 33% | 89% | 73% | 59% | — |
| Availability and quality of drinking water | 81% | 55% | 100% | 74% | 73% | — |
| Cleanliness and tidiness | 58% | 39% | 75% | 66% | 48% | — |
| Noise and Light pollution | 45% | 55% | 29% | 46% | 54% | — |
| Water Pollution | 32% | 54% | 19% | 29% | 39% | — |
Air quality in nearby cities
All cities →Portugal↗
Porto
PM2.512
PM1020.2
µg/m³
PM2.5 · FairNO₂ 20O₃ 40
September 27, 202602:00
Portugal↗
Braga
PM2.515
PM1023.1
µg/m³
PM2.5 · FairNO₂ 10.5O₃ 40
September 27, 202602:00
Portugal↗
Lisbon
PM2.510.4
PM1017.2
µg/m³
PM2.5 · FairNO₂ 6.6O₃ 71
September 27, 202602:00
Portugal↗
Setúbal
PM2.59.7
PM1018.8
µg/m³
PM2.5 · FairNO₂ 6.7O₃ 65
September 27, 202602:00
Portugal↗
Funchal Municipality
PM2.57.6
PM1013.4
µg/m³
PM2.5 · FairNO₂ 4.7O₃ 73
September 27, 202602:00
Portugal · air quality in other cities
WEATHER & SURROUNDINGS
Coimbra · weather forecast
Daily maximum and minimum temperatures. Forecast point: 40.2056, -8.4195.
Scroll the forecast to see the following days.
Coimbra · September 24, 2026: minimum temperature 15.9°C, maximum 30°C. Wind: 13.8 km/h. Humidity: 34%.
Full forecast: temperature, rainfall, wind and humidity
| Date | Day °C | Min °C | Max °C | Night °C | Rain mm | Wind m/s | Humidity % | Clouds % |
|---|---|---|---|---|---|---|---|---|
| 2026-09-24 | 28.7 | 15.9 | 30 | 17.5 | — | 3.8 | 34 | 4 |
| 2026-09-25 | 22.9 | 16.4 | 25.7 | 16.7 | — | 4.4 | 50 | 88 |
| 2026-09-26 | 31.1 | 13.4 | 33.4 | 20.1 | 0.1 | 4.2 | 33 | 87 |
| 2026-09-27 | 30.4 | 16.5 | 30.8 | 16.9 | 2.2 | 4 | 41 | 95 |
| 2026-09-28 | 26.4 | 14.1 | 26.9 | 17.3 | 4.8 | 4.7 | 47 | 47 |
| 2026-09-29 | 24.3 | 16.9 | 24.3 | 22.7 | 1.6 | 4.8 | 49 | 100 |
| 2026-09-30 | 21.3 | 15.7 | 22.2 | 15.7 | 10 | 3.6 | 76 | 50 |
| 2026-10-01 | 22.7 | 11.1 | 25 | 14.5 | 1 | 3.4 | 53 | 46 |
| 2026-10-02 | 27.9 | 15.2 | 29.4 | 19.3 | 0.5 | 3.3 | 37 | 100 |
| 2026-10-03 | 27.9 | 16.8 | 29.7 | 19 | 0.9 | 2.5 | 44 | 85 |
| 2026-10-04 | 30.6 | 17.8 | 31.5 | 19.8 | 1.8 | 2.4 | 35 | 67 |
| 2026-10-05 | 30 | 18.1 | 31 | 20.1 | 0.7 | 3 | 38 | 26 |
| 2026-10-06 | 30 | 18.3 | 30.9 | 20.5 | 0.4 | 3.7 | 36 | 14 |
| 2026-10-07 | 32.3 | 18.6 | 32.3 | 20.9 | 0.4 | 3.8 | 32 | 5 |
| 2026-10-08 | 32.2 | 18.9 | 32.2 | 19.1 | — | 5.3 | 31 | 1 |
| 2026-10-09 | 29 | 16.1 | 29 | 16.1 | — | 4.2 | 35 | 39 |
| 2026-10-10 | 24.1 | 15 | 24.1 | 16.3 | — | 5.1 | 42 | 99 |
| 2026-10-11 | 24 | 15.4 | 24 | 24 | — | 6 | 43 | 73 |
UV index by day · Coimbra
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.
Coimbra · September 26, 2026: UV index: 4.3 .
| Indicator | 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 | 2026-10-11 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index | 4.3 | 4.5 | 5.1 | 2.8 | 5.4 | 4.7 | 4.4 | 3.7 | 5 | 4.7 | 4.9 | 4.9 | 3 | 3.4 | 4.1 | — |
Sea temperature and waves · Portugal
Data for a selected coastal point.
Scroll the forecast to see the following days.
Portugal · September 26, 2026: Sea temperature (°C): 18.8 . Wave height (m): 1 .
| Indicator | 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 | 2026-10-11 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 18.8 | 18.7 | 18.7 | 18.5 | 18.8 | 18.8 | 18.6 | 18.6 | 18.6 | — | — | — | — | — | — | — |
| Wave height (m) | 1 | 0.7 | 0.7 | 0.9 | 1.2 | 1.4 | 1 | 0.6 | 0.4 | — | — | — | — | — | — | — |
Sea temperature throughout the year · Portugal
Monthly climate values for a selected coastal area (°C).
15.1°Jan
14.9°Feb
15.2°Mar
16.9°Apr
17.8°May
19.5°Jun
19.8°Jul
19.7°Aug
18.7°Sep
19°Oct
17.7°Nov
15.7°Dec
| °C | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea | 15.1 | 14.9 | 15.2 | 16.9 | 17.8 | 19.5 | 19.8 | 19.7 | 18.7 | 19 | 17.7 | 15.7 |
AIR QUALITY QUESTIONS
Coimbra · air pollution - questions and answers
What do the latest air quality data show for Coimbra?
Coimbra - latest available concentrations (September 27, 2026, 02:00 local time): PM2.5: 11.9 µg/m³, PM10: 20.6 µg/m³, O₃: 42 µg/m³, NO₂: 15.3 µg/m³, SO₂: 2.6 µg/m³, CO: 162 µg/m³. These are hourly CAMS model values for a point representing the city.
When was PM2.5 highest in Coimbra over the past week?
The highest available daily mean PM2.5 was 14.4 µg/m³ (September 23, 2026). This comparison covers 7 days with data in the seven days before September 27, 2026. The day of the latest reading is excluded because it may be incomplete.
What period does the pollution history for Coimbra cover?
Available monthly means cover 2017-09 - 2020-05. The tables include PM10, O₃, NO₂. 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 Coimbra 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 Coimbra?
For September 26, 2026, the forecast UV index is 4.3. The UV section also shows the following available days.
What wind speed is forecast for Coimbra?
For September 24, 2026, forecast wind speed is 13.8 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.