What Is Air Quality Index?
The Air Quality Index (AQI) is a standardized scale from 0 to 500 that communicates how clean or polluted the air is. An AQI of 0-50 is considered good, while anything above 150 is unhealthy for all groups. Skopje frequently exceeds 200 during winter months, placing it among the most polluted cities in Europe seasonally.
Skopje's winter AQI regularly exceeds 200, making it one of Europe's most polluted cities during the heating season.