Air quality by country
Air quality in Costa Rica today
Updated
Good: average US AQI 37 across 5 cities Worst now: San José, San José (39); cleanest: Liberia (30).
Live US AQI, PM2.5 and ozone for cities across Costa Rica, ranked from most polluted to cleanest.
- Average US AQI
- 37 Good
- Most polluted now
- San José, San José AQI 39
- Cleanest now
- Liberia AQI 30
- Cities above 100
- 0 unhealthy for sensitive groups or worse
Air quality in Costa Rica today
Right now the modelled air quality in Costa Rica averages a US AQI of 37 (Good) across the 5 cities we track. By category: 5 Good (of 5).
That is 29 points better than the worldwide average of 66 across 3,556 cities.
San José, San José has the worst air at 39 with PM2.5 at 3.6 µg/m³, while Liberia is cleanest at 30. No tracked city is above 100, the level where sensitive groups are advised to cut back outdoors.
Costa Rica cities by AQI (most polluted first)
| City | Region | US AQI | Category | PM2.5 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| San José, San José | San José | 39 | Good | 3.6 | 61 |
| San Pedro, San José | San José | 39 | Good | 3.6 | 61 |
| San Juan, San José | San José | 39 | Good | 3.6 | 61 |
| San Pablo, Heredia Province | Heredia Province | 39 | Good | 3.6 | 61 |
| Liberia | Guanacaste Province | 30 | Good | 4.8 | 71 |
What the US AQI numbers mean
| US AQI | Category | What it means |
|---|---|---|
| 0-50 | Good | Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. |
| 51-100 | Moderate | Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. |
| 101-150 | Unhealthy for Sensitive Groups | People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. |
| 151-200 | Unhealthy | Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. |
| 201-300 | Very Unhealthy | Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors. |
| 301-500 | Hazardous | Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500. |
Modelled by CAMS (Copernicus) via Open-Meteo, refreshed twice a day; read hour by hour from the forecast.
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Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS).