Air Quality Lab — San José, Costa Rica
Air Quality Profile
San José reports an annual PM2.5 of 18.4 µg/m³. That's meaningfully above the WHO 2021 guideline of 5 µg/m³ yet within the EU annual limit of 25 µg/m³.
San José
Costa Rica
Costa RicaAnnual Average
ModerateWHO annual classification
18.4µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
1616 µg/m³ — Moderate
1414 µg/m³ — Fair
1717 µg/m³ — Moderate
1919 µg/m³ — Moderate
2121 µg/m³ — Moderate
2020 µg/m³ — Moderate
2121 µg/m³ — Moderate
2121 µg/m³ — Moderate
1919 µg/m³ — Moderate
1717 µg/m³ — Moderate
1919 µg/m³ — Moderate
1616 µg/m³ — Moderate
Jan
Feb
Mar
Apr
May
Jun
1616 µg/m³ — Moderate
1414 µg/m³ — Fair
1717 µg/m³ — Moderate
1919 µg/m³ — Moderate
2121 µg/m³ — Moderate
2020 µg/m³ — Moderate
Jul
Aug
Sep
Oct
Nov
Dec
2121 µg/m³ — Moderate
2121 µg/m³ — Moderate
1919 µg/m³ — Moderate
1717 µg/m³ — Moderate
1919 µg/m³ — Moderate
1616 µg/m³ — Moderate
Best months: Jan–Feb, DecWorst months: May, Jul–Aug
Fair10–15 µg/m³Moderate15–25 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared across Costa Rica
San José: 18.4 µg/m³. Typical range in Costa Rica: 14.9–16.0 µg/m³. Low anchor: Puntarenas, 12.3 µg/m³.
18 cities tracked