Fine particles
5.8µg/m³CAMS model • Open-Meteo
Costa RicaAir quality, PM2.5 and PM10
Compare air quality across cities in this country. Explore PM2.5, PM10 and other pollutant concentrations, check data timestamps, and view recent trends and historical charts.
Costa Rica - average concentrations across available points: PM2.5: 5.8 µg/m³, PM10: 5.9 µg/m³, O₃: 29 µg/m³, NO₂: 31 µg/m³, SO₂: 6 µg/m³, CO: 1,242 µg/m³. Date range: September 25, 2026. Each point contributes its latest available hourly value; this is not a daily or population-weighted average.
Air quality questions →All cities · Costa Rica
1 citiesPM2.5 vs PM10 - what is the difference? → · Models and monitoring stations →
AVERAGE ACROSS AVAILABLE COUNTRY POINTS
Latest concentrations · Costa Rica
Particulate matter
5.9µg/m³Ozone
29µg/m³Nitrogen dioxide
31µg/m³Sulphur dioxide
6µg/m³Carbon monoxide
1,242µg/m³Average of the latest available hour at each model point. This is neither a population-weighted nor a daily average.
DAILY DATA · Costa Rica
Costa Rica - air pollution over recent days (2026-08-30 - 2026-09-24)
Averages across available points in the country. These are not population-weighted averages.
PM2.5Lowest 3.98 2026-08-30Highest 12.82 2026-09-222026-08-30 - 2026-09-24
PM10Lowest 4.51 2026-08-30Highest 12.91 2026-09-222026-08-30 - 2026-09-24
O₃Lowest 28.58 2026-09-01Highest 47.88 2026-09-052026-08-30 - 2026-09-24
NO₂Lowest 6.15 2026-09-05Highest 24.99 2026-09-222026-08-30 - 2026-09-24
SO₂Lowest 2.78 2026-08-30Highest 5.13 2026-09-232026-08-30 - 2026-09-24
COLowest 193.38 2026-08-30Highest 748.08 2026-09-232026-08-30 - 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 | 7.69 | 12.08 | 12.82 | 6.46 | 5.48 | 6.76 | 6.79 | 5.34 | 4.22 | 7.54 | 7.31 | 10.26 | 7.96 | 7.1 | 3.98 |
| PM10 | 8 | 12.19 | 12.91 | 6.59 | 5.67 | 7.85 | 7.88 | 6.03 | 4.9 | 8.87 | 8.5 | 11.26 | 9.61 | 8.4 | 4.51 |
| O₃ | 42.13 | 39.42 | 37.96 | 36.08 | 35.29 | 32.42 | 36 | 35.75 | 47.88 | 34.75 | 31.29 | 29.04 | 28.58 | 31.54 | 32.96 |
| NO₂ | 14.55 | 21.17 | 24.99 | 19.1 | 13.12 | 12.08 | 12.3 | 8.88 | 6.15 | 10.72 | 12.45 | 17.35 | 14.57 | 10.83 | 6.69 |
| SO₂ | 4.62 | 5.13 | 4.63 | 4.82 | 4.53 | 4.6 | 3.94 | 3.2 | 2.91 | 3.25 | 3.68 | 4.13 | 3.67 | 3.39 | 2.78 |
| CO | 700 | 748.08 | 681.17 | 498.17 | 430.79 | 369.13 | 575.21 | 373.13 | 195.71 | 304.5 | 295.21 | 405.83 | 476.38 | 279.63 | 193.38 |
A dot on the chart and a dash in the table indicate missing data. The latest day may be incomplete.
Environment and quality of life ratings · Costa Rica
Archived ratings of the local environment: green spaces, cleanliness, noise and water quality. Opinion indicators are separate from pollutant concentration measurements.
| Indicator | Costa Rica | Nicaragua | Panama | Honduras | El Salvador | Guatemala |
|---|---|---|---|---|---|---|
| Green and Parks in the City | 61% | 43% | 51% | 41% | 37% | 45% |
| Pleasure of spending time in the city | 62% | 52% | 55% | 41% | 40% | 45% |
| Air Pollution | 36% | 39% | 42% | 65% | 65% | 64% |
| Garbage Disposal | 50% | 30% | 33% | 22% | 33% | 30% |
| Availability and quality of drinking water | 83% | 49% | 66% | 44% | 41% | 39% |
| Cleanliness and tidiness | 46% | 29% | 37% | 20% | 29% | 34% |
| Noise and Light pollution | 47% | 63% | 60% | 49% | 57% | 56% |
| Water Pollution | 44% | 73% | 57% | 72% | 68% | 71% |
WEATHER & SURROUNDINGS
Costa Rica · weather forecast
Daily maximum and minimum temperatures. Forecast point: 9.7489, -83.7534.
Scroll the forecast to see the following days.
Costa Rica · September 23, 2026: minimum temperature 14.7°C, maximum 23.9°C. Wind: 8.8 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 % |
|---|---|---|---|---|---|---|---|---|
| 2026-09-23 | 22.9 | 14.7 | 23.9 | 16.9 | 6.6 | 2.5 | 67 | 36 |
| 2026-09-24 | 23.3 | 15.3 | 23.3 | 17.4 | 11 | 2.6 | 68 | 35 |
| 2026-09-25 | 22.1 | 16.2 | 22.5 | 17.2 | 15.3 | 1.8 | 61 | 69 |
| 2026-09-26 | 24.1 | 16.5 | 24.1 | 17.4 | 5.8 | 2.1 | 51 | 99 |
| 2026-09-27 | 24.3 | 15.2 | 24.3 | 18.1 | 4.4 | 2.2 | 59 | 95 |
| 2026-09-28 | 23.3 | 17.1 | 23.6 | 17.5 | 0.5 | 2.8 | 66 | 98 |
| 2026-09-29 | 24.6 | 16.8 | 24.6 | 17.8 | 1.8 | 2.1 | 63 | 94 |
| 2026-09-30 | 21.6 | 15.8 | 22.9 | 17.7 | 20.8 | 1.7 | 79 | 92 |
| 2026-10-01 | 22.4 | 17.4 | 22.6 | 18.2 | 18.8 | 1.1 | 85 | 82 |
| 2026-10-02 | 20.7 | 17.3 | 20.7 | 17.4 | 61.6 | 1.3 | 91 | 95 |
| 2026-10-03 | 21 | 16.9 | 21.8 | 17.7 | 91.8 | 1.6 | 89 | 94 |
| 2026-10-04 | 17.7 | 16.7 | 21.6 | 16.8 | 11 | 2.3 | 94 | 100 |
| 2026-10-05 | 17.9 | 16.7 | 18.3 | 16.7 | 14.7 | 2.1 | 96 | 100 |
| 2026-10-06 | 19.1 | 16.5 | 19.1 | 16.5 | 21 | 1.6 | 90 | 100 |
| 2026-10-07 | 18.6 | 16.3 | 18.8 | 16.3 | 5.9 | 1.1 | 88 | 100 |
| 2026-10-08 | 21.6 | 15.1 | 21.9 | 16.6 | 3.9 | 1.5 | 72 | 99 |
| 2026-10-09 | 20.7 | 15.9 | 21.1 | 16.9 | 20.9 | 1.2 | 86 | 100 |
UV index by day · Costa Rica
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.
Costa Rica · September 25, 2026: UV index: 7.7 .
| 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 | 7.7 | 8.1 | 8.6 | 7.7 | 7.9 | 8.5 | 8.8 | 7.1 | 7.4 | 4 | 1.7 | 5.7 | 2.8 | 5.8 | 7.3 | — |
AIR QUALITY QUESTIONS
Costa Rica · air pollution - questions and answers
What do the latest air quality data show for Costa Rica?
Costa Rica - average concentrations across available points: PM2.5: 5.8 µg/m³, PM10: 5.9 µg/m³, O₃: 29 µg/m³, NO₂: 31 µg/m³, SO₂: 6 µg/m³, CO: 1,242 µg/m³. Date range: September 25, 2026. Each point contributes its latest available hourly value; this is not a daily or population-weighted average.
When was PM2.5 highest in Costa Rica over the past week?
The highest available daily mean PM2.5 was 12.8 µg/m³ (September 22, 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.
Is the PM2.5 concentration for Costa Rica 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 Costa Rica?
For September 25, 2026, the forecast UV index is 7.7. The UV section also shows the following available days.
What wind speed is forecast for Costa Rica?
For September 23, 2026, forecast wind speed is 8.8 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.