Long-term trends in nitrogen oxides at different types of monitoring stations in the Czech Republic

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00020699%3A_____%2F20%3AN0000045" target="_blank" >RIV/00020699:_____/20:N0000045 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0048969719343694" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0048969719343694</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.scitotenv.2019.134378" target="_blank" >10.1016/j.scitotenv.2019.134378</a>

Result language

angličtina

Original language name

Long-term trends in nitrogen oxides at different types of monitoring stations in the Czech Republic

Original language description

Nitrogen oxides (NOx) are important in atmospheric chemistry and have substantial environmental impacts. This study provides a detailed data analysis on long-term changes in ambient NOx levels within the framework of their emission pattern. We examined the trends in NOx, NO, NO2 and NO2/NOx ratio at 39 Czech sites representing different environments (urban, rural, mountain, industrial) in 1994–2016, i.e. a 23-year time series, using the non-parametric Man-Kendall test. The ambient air concentrations in NO, NO2 and NOx decreased significantly at most of the sites, as was assumed due to the substantial NOx emission decrease over the period under review. The largest decrease per year was detected at the urban site in capital Prague (decrease in the 98th percentile equal to 2.28 ppb, decrease in the annual median equal to 1.00 ppb). At some sites, however we observed a substantial equivocal temporal change in the NO2/NOx ratio. Whereas at some sites the NO2/NOx ratio was decreasing, at other sites the trend was increasing significantly. The highest increase per year in the annual median of the NO2/NOx ratio, equal to 0.0086 was detected at the urban Praha 1-nám-Rep. site; the highest increase per year in the 98th percentile, equal to 0.0126 was recorded at the rural Krupka site. Most sites (regardless of type) with generally increasing trends in the NO2/NOx ratio, are situated in the north-west portion of the Czech Republic The increasing NO2/NOx ratio detected at some sites is believed to implicate undesired changes in atmospheric chemistry, namely with respect to ambient O3 formation, promoting increasing O3 concentrations.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10509 - Meteorology and atmospheric sciences

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Science of The Total Environment

ISSN

0048-9697

e-ISSN

1879-1026

Volume of the periodical

699

Issue of the periodical within the volume

1

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

14

Pages from-to

134378

UT code for WoS article

000500583400093

EID of the result in the Scopus database

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