Air Quality Lab — San José, Costa Rica
Air Quality Profile·
San José reports an annual PM2.5 of 15.9 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
15.9µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
1313 µg/m³ — Fair
1616 µg/m³ — Moderate
1414 µg/m³ — Fair
1616 µg/m³ — Moderate
1515 µg/m³ — Fair
1515 µg/m³ — Moderate
1818 µg/m³ — Moderate
1818 µg/m³ — Moderate
1919 µg/m³ — Moderate
1919 µg/m³ — Moderate
1616 µg/m³ — Moderate
1414 µg/m³ — Fair
Jan
Feb
Mar
Apr
May
Jun
1313 µg/m³ — Fair
1616 µg/m³ — Moderate
1414 µg/m³ — Fair
1616 µg/m³ — Moderate
1515 µg/m³ — Fair
1515 µg/m³ — Moderate
Jul
Aug
Sep
Oct
Nov
Dec
1818 µg/m³ — Moderate
1818 µg/m³ — Moderate
1919 µg/m³ — Moderate
1919 µg/m³ — Moderate
1616 µg/m³ — Moderate
1414 µg/m³ — Fair
Best months: Jan, Mar, DecWorst months: Aug–Oct
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: 15.9 µg/m³. Typical range in Costa Rica: 14.9–16.0 µg/m³. Low anchor: Puntarenas, 12.3 µg/m³.
18 cities tracked