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Open AccessArticle

Long-Term Trends of Air Pollution at National Atmospheric Observatory Košetice (ACTRIS, EMEP, GAW)

1
Czech Hydrometeorological Institute, Košetice Observatory, 394 22 Košetice, Czech Republic
2
Institute for Environmental Studies, Faculty of Science, Charles University, 128 01 Prague, Czech Republic
3
Czech Hydrometeorological Institute, 143 06 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(5), 537; https://doi.org/10.3390/atmos11050537
Received: 30 March 2020 / Revised: 14 May 2020 / Accepted: 19 May 2020 / Published: 21 May 2020
(This article belongs to the Special Issue Ambient Air Quality in the Czech Republic)
The National Atmospheric Observatory Košetice operated by the Czech Hydrometeorological Institute was established in 1988 as a station specializing in air quality monitoring at the background scale. The observatory is located in the free area outside of the settlement and represents the Czech Republic in various international projects. The objective of the present study is to detect the long-term trends of air quality at the background scale of the Czech Republic. The statistical method used for trend analysis is based on the nonparametric Mann–Kendall test. Generally, the results show that the fundamental drop in emission of basic air pollutants was reflected in the significant decrease in pollution levels. A most significant drop was detected for sulphur. No trend was found for NO2 in 1990–2012, but a visibly decreasing tendency was registered in the last 7 years. A slightly decreasing trend was registered for O3 in the whole period, but a slightly increasing tendency was found after 2006. More importantly, the number of episodes exceeding the target value for human health dropped significantly. The reduction of volatile organic compounds (VOCs) emissions was reflected in a statistically significant decrease of concentrations. Only isoprene, which is of natural origin, displays an inverse trend. Concentrations of elemental carbon (EC) and organic carbon (OC) dropped since 2010, but only for EC is the trend statistically significant. View Full-Text
Keywords: long-term trends; background scale; air quality; Czech Republic long-term trends; background scale; air quality; Czech Republic
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Váňa, M.; Holubová Smejkalová, A.; Svobodová, J.; Machálek, P. Long-Term Trends of Air Pollution at National Atmospheric Observatory Košetice (ACTRIS, EMEP, GAW). Atmosphere 2020, 11, 537.

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