Monthly Reports – Air Quality in the Czech Republic

In accordance with Annex 2 of Decree No. 106/2025 Coll., implementing certain provisions of the Act on Public Hydrometeorological Service, the Czech Hydrometeorological Institute (CHMI) provides access to monthly reports assessing air quality. The Air Quality Division of the Czech Hydrometeorological Institute (CHMI) has been issuing reports from October 2014 to the end of 2023, evaluating air pollution and dispersion conditions in the Czech Republic for the preceding month. The aim of these reports is to provide the public with the most up-to-date information and assessments of the situation.

The evaluation primarily relies on measured concentrations of suspended particulate matter (PM10), which represents one of the major air quality issues. During the period from April to September, ground-level ozone concentrations are also assessed, as their levels often increase to the point of exceeding air quality limits during the warmer months.

If unusually high or above-limit concentrations of sulfur dioxide, nitrogen dioxide, or carbon monoxide occur during the evaluated month, the report also includes an assessment of these pollutants. Evaluations of air pollution by ground-level ozone, often referred to as a "summer" pollutant, are included in reports from April to September. Concentrations of other substances with air quality limits, such as benzo[a]pyrene and heavy metals, cannot be included in the monthly reports due to the time required for sampling and processing.