Air Quality Warnings worldwide

Smog, particulate matter, ozone and pollen — covered for 197 countries. Air quality warnings are issued when particulate matter (PM2.5 and PM10), ozone, nitrogen dioxide or sulphur dioxide reach levels that harm health, or when Saharan dust, wildfire smoke or winter smog episodes push concentrations up.

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What counts as a air quality warnings

Air quality warnings are issued when particulate matter (PM2.5 and PM10), ozone, nitrogen dioxide or sulphur dioxide reach levels that harm health, or when Saharan dust, wildfire smoke or winter smog episodes push concentrations up. Values are usually published as an air quality index, but the index scale and its breakpoints differ from country to country.

If a warning is active

• Ventilate in the early morning on smog days and keep windows shut at peak hours.
• Avoid strenuous outdoor exercise when the index is high.
• Wear a well-fitted FFP2 or N95 mask if you must be outdoors in smoke or dust.

Sources used for this category

Open-Meteo Air Quality, Copernicus CAMS, national environment agencies, national pollen services. Waarning reads these public feeds directly in your browser; the official warning always keeps the name of the authority that issued it.

Frequently asked questions

Other warning categories

• Severe Weather Warnings
• Heat Warnings
• Cold and Snow Warnings
• Drought Warnings
• Coastal and Marine Warnings
• Space Weather Warnings

Generated 2026-10-12.