How is air quality in Costa Rica in 2026?

The Central Valley concentrates vehicle exhaust along General Cañas and peri-urban corridors that keep everyday particulate and NO2 stress higher than postcard beaches: Living in San José, Living in Escazú, and Living in Heredia. Dry-season months can add dust when rains pause and winds loft unpaved edges: Dry season and Wind.

Pacific coasts often feel cleaner on ordinary days because ocean ventilation flushes street-level pollutants, though tourist traffic and construction dust still appear near dense strips: Living in Tamarindo. Volcanic ash from active cordillera volcanoes and regional agricultural burning can push short unhealthy overlays even when local traffic is normal. Higher cloud-forest belts usually stay mistier and cooler rather than smoggy: Altitude and climate.

Ask how your exact street behaves at rush hour and during dry months before you celebrate a hillside view. Sensitive lungs may prefer western Escazú ridges or beach ventilation over a canyon beside a highway: Where to live in Costa Rica and Best climate. Keep windows and filters ready for ash or dust weeks, and do not confuse sticky humidity with dirty air: Humidity. Extreme UV still hits on clear days even when AQI looks fine: UV. Flood and landslide weeks are a separate green-season risk: Flood risk.