The network of measuring stations registered in the ISKO database in 2018–2022. The basis for the air quality assessment is the concentrations measured at the monitoring stations. The measurement network is densest in the areas with the highest concentrations of pollutants, but covers the whole Czech Republic. The backbone network of monitoring stations is the National Air Quality Monitoring Network (NAQMN), operated by the CHMI. It includes both stations with an automated monitoring programme (AIM) and stations with a manual monitoring programme (MIM), from which the samples taken are analysed in the laboratories of the CHMI. In many cases, air pollution at one site is monitored simultaneously by both automatic and manual methods. The national network of concentration monitoring is supplemented by monitoring stations of other organisations, whose measurements are also used in the assessment of air quality.

Concentrations measured by all monitoring networks are stored in the AQIS air pollution database. The database contains data from the beginning of measurements, and sulphur dioxide and suspended particulate matter concentrations from the station networks of the CHMI in North Bohemia and Prague from 1971. Accompanying meteorological data, which are measured at a large part of the automated monitoring stations of the CHMI are used for the evaluation of air quality-meteorological relationships, are also stored in the ISKO database. In addition, the ISKO emission database also includes data provided by cooperating institutions. These include the Public Health Institute in Ostrava, the Public Health Institute in Ústí nad Labem, the National Institute of Health, ČEZ, a. s., municipal authorities and other contributors. The database also includes information from the border areas of Slovakia, Germany, Poland and Austria.

Overview of concentrations of air pollutants for which limit values for the protection of human health have been set, measured at station networks of ambient air quality monitoring in the Czech Republic: r18–r22As - List of stations with annual average concentrations of As, 2018–2022; r18–r22BaP - List of stations with annual average concentrations of benzo[a]pyrene, 2018–2022; r18–r22BZN – List of stations with annual average concentrations of benzene, 2018–2022; r18–r22Cd – List of stations with annual average concentrations of cadmium, 2018–2022; r18–r22NO2 – List of stations with concentrations of NO2 (annual average and 19. highest hourly concentrations), 2018–2022; r18–r22O3 – List of stations with ground-level ozone concentrations (max. daily 8-hour moving average, averaged over 3 years), 2018–2022; r18–r22PM10 – List of stations with PM10 concentrations (annual mean and 36. highest 24-hour concentrations), 2018–2022; r18–r22PM25 – List of stations with PM2.5 annual average concentrations, 2018–2022; r18–r22SO2zdr – List of stations with SO2 concentrations (25th highest hourly concentrations and 4th highest 24-hour concentrations), 2018–2022. Summary of concentrations of air pollutants for which immission limits are set to protect ecosystems and vegetation, measured at station networks of ambient air quality monitoring in the Czech Republic: r18–r22AOT40 – AOT40 exposure index values, 5-year average, 2018–2022 [µg. m-3.h]; r18–r22NOx – List of stations with annual average NOx concentrations, 2018–2022; r18–r22SO2zp – List of stations with SO2 concentrations (winter average), 2018–2022; r18–r22SO2rp – List of stations with annual average SO2 concentrations, 2018–2022.

The network of measuring stations registered in the ISKO database in 2023. The basis for the air quality assessment is the concentrations measured at the monitoring stations. The measurement network is densest in the areas with the highest concentrations of pollutants, but covers the whole Czech Republic. The backbone network of monitoring stations is the National Air Quality Monitoring Network (NAQMN), operated by the CHMI. It includes both stations with an automated monitoring programme (AIM) and stations with a manual monitoring programme (MIM), from which the samples taken are analysed in the laboratories of the CHMI. In many cases, air pollution at one site is monitored simultaneously by both automatic and manual methods. The national network of concentration monitoring is supplemented by monitoring stations of other organisations, whose measurements are also used in the assessment of air quality.

Concentrations measured by all monitoring networks are stored in the AQIS air pollution database. The database contains data from the beginning of measurements, and sulphur dioxide and suspended particulate matter concentrations from the station networks of the CHMI in North Bohemia and Prague from 1971. Accompanying meteorological data, which are measured at a large part of the automated monitoring stations of the CHMI are used for the evaluation of air quality-meteorological relationships, are also stored in the ISKO database. In addition, the ISKO emission database also includes data provided by cooperating institutions. These include the Public Health Institute in Ostrava, the Public Health Institute in Ústí nad Labem, the National Institute of Health, ČEZ, a. s., municipal authorities and other contributors. The database also includes information from the border areas of Slovakia, Germany, Poland and Austria.

Overview of concentrations of air pollutants for which limit values for the protection of human health have been set, measured at station networks of ambient air quality monitoring in the Czech Republic: r23As - List of stations with annual average concentrations of As, 2023; r23BaP - List of stations with annual average concentrations of benzo[a]pyrene, 2023; r23BZN – List of stations with annual average concentrations of benzene, 2023; r23Cd – List of stations with annual average concentrations of cadmium, 2023; r23NO2 – List of stations with concentrations of NO2 (annual average and 19. highest hourly concentrations), 2023; r23O3 – List of stations with ground-level ozone concentrations (max. daily 8-hour moving average, averaged over 3 years), 2023; r23PM10 – List of stations with PM10 concentrations (annual mean and 36. highest 24-hour concentrations), 2023; r23PM25 – List of stations with PM2.5 annual average concentrations, 2023; r23SO2zdr – List of stations with SO2 concentrations (25th highest hourly concentrations and 4th highest 24-hour concentrations), 2023. Summary of concentrations of air pollutants for which immission limits are set to protect ecosystems and vegetation, measured at station networks of ambient air quality monitoring in the Czech Republic: r23AOT40 – AOT40 exposure index values, 5-year average, 2023 [µg. m-3.h]; r23NOx – List of stations with annual average NOx concentrations, 2023; r23SO2zp – List of stations with SO2 concentrations (winter average), 2023; r23SO2rp – List of stations with annual average SO2 concentrations, 2023.

In accordance with Act 123/1998 Coll. on free access to environmental information, as amended, the CHMI has provided verified primary and aggregated data on outdoor air pollutants. These are the main pollutants with limit values according to current legislation: arsenic (As), benzene, benzo[a]pyrene, cadmium (Cd), carbon monoxide (CO), nickel (Ni), nitrogen dioxide (NO2), nitrogen oxides (NOX), ground-level ozone (O3), lead (Pb), particulate matter (PM10), particulate matter (PM2.5), sulphur dioxide (SO2). The data are based on measurements at stations owned by the CHMI for the period 1969-2022. The primary data are presented in measurement intervals of 30 min, 1 h or 24 h, depending on the type of measurement. Aggregated data are calculated from the above primary data. These data are: daily mean values, monthly mean values, annual mean values and the number of exceedances of the limit values for the protection of human health. Verified data for subsequent calendar years from 2020 will always be available by 1 July of the following year.