Air Quality Index – Preliminary Data

In accordance with Annex 2 of Decree 106/2025 Coll., which implements certain provisions of the Act on the Public Hydrometeorological Service, the Czech Hydrometeorological Institute (CHMI) provides operational (unverified) hourly data on the Air Quality Index. The Air Quality Index (IKO) provides a summary of air quality at a specific monitoring station. This index was developed by the Air Quality Division of the Czech Hydrometeorological Institute (ČHMÚ) in collaboration with the National Institute of Public Health (SZÚ). Specific advice and recommendations from SZÚ aimed at protecting human health can be found here: www.chmi.cz/files/portal/docs/uoco/web_generator/d_szu.pdf. The rules for determining the IKO and its calculation are available at https://www.chmi.cz/files/portal/docs/uoco/web_generator/iko3h_cz.pdf. Information for the public provided through a simple and comprehensible indicator that comprehensively reflects air quality, considering health-based recommendations from the World Health Organization.