Assessment of air quality using diffusive samplers and ADMS-Urban

The main sources of inorganic pollutants are emissions from facilities of the en-ergy sector and transport exhaust emissions. Nitrogen dioxide (NO2) as one of the most important inorganic air pollutants forms during the combustion process, especially in motor vehicles. Passive diffusive samplers used to measure NO2 be-come more popular because of their simplicity, low cost and possibility to measure in large areas, including cities, regions or even different countries. The aim of this paper is to compare the data on air quality assessment obtained by means of in-dicative measurements and modelling based on the data from Žirmūnai district, Vilnius city, Lithuania. Nitrogen dioxide was measured with diffusive samplers in 25 points in the dis-trict. Samplers were attached to the street light poles. Diffusive samplers consisted of stainless steel mesh discs coated with triethanolamine. Higher concentrations of nitrogen dioxide were measured near intensive traffic streets: Kareivių and Žirmūnų. The average NO2 concentration was up to 39.0 µg/m3 at the measure-ment points located near these streets. 2.2 times lower concentrations (17.7 µg/m3