Air Quality Lab — San Isidro, Costa Rica
Air Quality Profile·
San Isidro reports an annual PM2.5 of 15.5 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 Isidro
Costa Rica
Costa RicaAnnual Average
ModerateWHO annual classification
15.5µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
1414 µg/m³ — Fair
1414 µg/m³ — Fair
1515 µg/m³ — Fair
1616 µg/m³ — Moderate
1717 µg/m³ — Moderate
1616 µg/m³ — Moderate
2020 µg/m³ — Moderate
1616 µg/m³ — Moderate
1616 µg/m³ — Moderate
1313 µg/m³ — Fair
1414 µg/m³ — Fair
1515 µg/m³ — Moderate
Jan
Feb
Mar
Apr
May
Jun
1414 µg/m³ — Fair
1414 µg/m³ — Fair
1515 µg/m³ — Fair
1616 µg/m³ — Moderate
1717 µg/m³ — Moderate
1616 µg/m³ — Moderate
Jul
Aug
Sep
Oct
Nov
Dec
2020 µg/m³ — Moderate
1616 µg/m³ — Moderate
1616 µg/m³ — Moderate
1313 µg/m³ — Fair
1414 µg/m³ — Fair
1515 µg/m³ — Moderate
Best months: Jan–Feb, OctWorst months: May–Jul
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 Isidro: 15.5 µg/m³. Typical range in Costa Rica: 14.9–16.0 µg/m³. Low anchor: Puntarenas, 12.3 µg/m³. High anchor: San José, 18.4 µg/m³.
18 cities tracked