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        <gco:CharacterString>V souladu s přílohou 2 Vyhlášky 106/2025 Sb., kterou se provádí některá ustanovení zákona o veřejné hydrometeorologické službě, ČHMÚ zpřístupňuje měsíční zprávy hodnotící kvalitu ovzduší. Úsek ochrany čistoty ovzduší Českého hydrometeorologického ústavu vydával od října 2014 do konce roku 2023 zprávy hodnotící znečištění ovzduší a rozptylové podmínky v České republice za předchozí měsíc. Jejich účelem bylo poskytnout veřejnosti co nejnovější informace a hodnocení situace. Hodnocení vychází zejména z naměřených koncentrací suspendovaných částic PM10, které představují jeden z hlavních problémů kvality ovzduší. V období od dubna do září jsou hodnoceny i koncentrace přízemního ozonu, k jejichž navýšení až překračovaní hodnot imisního limitu dochází v teplejším období roku. Pokud v hodnoceném měsíci došlo i k výskytu neobvykle vysokých až nadlimitních koncentrací oxidu siřičitého, dusičitého a uhelnatého, jsou ve zprávě vyhodnoceny i koncentrace těchto látek. Vyhodnocení znečištění ovzduší přízemním ozonem, tedy tzv. „letní“ znečišťující látky, je součástí zpráv za duben až září. Koncentrace ostatních látek s imisním limitem, tj. benzo[a]pyrenu a těžkých kovů, nelze vzhledem k procesu získání a zpracování odebraných vzorků zahrnout do měsíčních zpráv.</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#locale-eng">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.</gmd:LocalisedCharacterString>
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Meteorological conditions are assessed based on measurements from CHMI’s meteorological network. An exception is dispersion conditions—these are evaluated using the ventilation index calculated by the ALADIN forecasting model. Nationwide average and maximum temperatures, as well as ventilation index averages, are also outputs of the ALADIN model.</gmd:LocalisedCharacterString>
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