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2 datasets found

Air Quality Measurement – Verified 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) has made verified primary and aggregated data available for outdoor air pollutants (pollutant concentrations from Concentration of pollutants from monitoring stations with automatic and manual programs, provided in the scope and temporal aggregations specified by Act No. 201/2012 Coll., on Air Protection).

The data include key pollutants with ambient air limit values under 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), suspended particles PM10, suspended particles PM2.5, and sulfur dioxide (SO₂).

The data are based on measurements from CHMI-owned stations since 1969. Primary data are provided in measurement intervals of 30 minutes, 1 hour, or 24 hours, depending on the type of measurement. Aggregated data are calculated from the aforementioned primary data and include the following: daily averages, monthly averages, annual averages, and the number of exceedances of ambient air limit values.

The most recent verified data available date back approximately 18 months from the current date, in accordance with the data verification process.

CSV Dataset is distributed using CSV.

Chemical composition of precipitation (concentrations of individual compounds) – verified primary data and aggregated data

In accordance with Annex 2 of Decree No. 106/2025 Coll., implementing certain provisions of the Act on the Public Hydrometeorological Service, CHMI has made available verified and aggregated data for concentrations of precipitation chemical composition. These include precipitation amount (RAIN), conductivity (cond), pH, arsenic (As), calcium ions (Ca²⁺), cadmium (Cd), chloride ions (Cl⁻), cobalt (Co), chromium (Cr), copper (Cu), fluoride ions (F⁻), iron (Fe), mercury (Hg), potassium ions (K⁺), magnesium ions (Mg²⁺), manganese (Mn), sodium ions (Na⁺), ammonium ions (NH₄⁺), nickel (Ni), nitrate ions (NO₃⁻), lead (Pb), total phosphorus (P-sum), selenium (Se), sulfate ions (SO₄²⁻), strontium (Sr), vanadium (V), zinc (Zn), and selected persistent organic pollutants: polycyclic aromatic hydrocarbons (POPs-PAH) and polychlorinated biphenyls (POPs-PCB).

The data are available from 1976 onwards and are site-specific. Primary data are provided in sampling intervals of 1 day, 1 week, 1 month, or irregularly, depending on the type of measurement. Aggregated data are calculated from the above-mentioned primary data. These include weekly, monthly, and annual concentrations, as well as weekly, monthly, and annual deposition.

The most recent verified data are approximately 18 months old relative to the current date, reflecting the data verification process.

CSV Dataset is distributed using CSV.