The Air Quality — PM2.5 indicator shows the daily mean concentration of fine particulate matter with aerodynamic diameter less than 2.5 micrometres (PM2.5). PM2.5 is the most hazardous fraction of atmospheric particulate matter: its small size allows it to penetrate deep into the respiratory tract and reach the circulatory system.
Major PM2.5 sources include fossil fuel combustion, biomass burning, industrial processes, and secondary photochemical reactions. Chronic exposure is associated with significant impacts on biodiversity, ecosystem health, and agricultural productivity. WHO 2021 guidelines recommend an annual limit of 5 μg/m³ and a daily limit of 15 μg/m³.
Data come from the Open-Meteo Air Quality API (CAMS model). The variable used is pm2_5 (PM2.5 concentration at ground level). For each day, the average of hourly values is calculated. Data are interpolated to the site's geographic position.
| Code | Name | Provider | Type | Coverage | Availability |
|---|---|---|---|---|---|
WRD_OPNAQ_99 | Open-Meteo Air Quality API | Open-Meteo / CAMS | db | Global (Europe: 11 km) | From 2013 to present |
Average daily concentration of fine particulate matter PM2.5 (diameter < 2.5 μm) at ground level. Open-Meteo variable: pm2_5. Daily average of hourly values. Source: Open-Meteo Air Quality API (CAMS). Unit: μg/m³.