The researchers used long-term measurements of hourly ozone concentrations in conjunction with measurements of nitrogen oxide concentrations gathered at stations across Germany to determine the relationship between temperature and ozone over the period 1999 to 20 to 2018. Together with her colleagues, Otero wanted to learn more about the effect of falling NOx emissions on the formation of ground-level ozone. In recent years, emissions have fallen significantly, partly due to improved vehicle exhaust values", explains lead author Noelia Otero (IASS Potsdam/FU Berlin). "Traffic is the most significant source of nitrogen oxide emissions in urban centers. The emissions are primarily produced during combustion processes in engines and industrial facilities. Nitrogen oxides (NOx) are among the precursors of ground-level ozone, which can irritate the eyes, nose and throat and aggravate respiratory conditions.
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