Most polluted cities in Costa Rica, July 2026

No city in Costa Rica had measurements on 70% of the days, so July 2026 has no board for Costa Rica.

Good0–9.0

Moderate9.1–35.4

Sensitive groups35.5–55.4

Unhealthy55.5–125.4

Very unhealthy125.5–225.4

Hazardous225.5+