Ambient nitrogen dioxide concentrations in Kaunas, Lithuania and its relation with wind speed and rainfall

Abstract

Emission of air pollutants is caused by different anthropogenic processes which can be categorized into the source groups motor traffic, industry, power plants, trade, and domestic fuel [...]. These emissions reduce the air quality in densely populated areas [...]. Road traffic is the main source of anthropogenic nitrogen oxide emissions. The sum of nitric oxide (NO) and nitrogen dioxide (NO2) is referred to as nitrogen oxide (NOx). Nitrogen dioxide (NO2) is either emitted directly from combustion processes or converted in the environment by the oxidation with ozone (O3) or oxygen (O2). However, nitrogen dioxide (NO2) is far more harmful with regard to toxicity and ozone-forming potential than nitrogen oxide (NO). [...]