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Research area
Traffic and Environment

Air quality inventory of Linz - Study of NO2 concentrations in the city of Linz


Project duration: 2007

Location: Linz, Upper Austria

Category: Air quality inventory

Client: State Government of Upper Austria

Description of project

In Linz the air quality standard for the annual mean value of NO2 was exceeded in 2005. Additionally, the whole municipality of Linz was declared a nonattainment area concerning NO2 as annual mean. Aim of this study was to determine those areas, where air quality standards are exceeded using dispersion calculation with the model system GRAMM/GRAL.

Emission data from domestic heating, trade and industry were based on the emission inventory of Upper Austria. Detailed traffic data were provided by the ASFiNAG and traffic emissions were calculated with the emission model NEMO (Network Emission Model, TU Graz). These three sources types were considered in dispersion simulations with the Lagrangian Model GRAL. Background concentrations were used for the evaluation of results.  

For the NO2 concentrations of the annual mean value the influence of traffic emissions on the high polluted road network within the city can easily be identified. Source apportionment was calculated for different reference points. These results were used for the elaboration of effective measurement policies aiming to reduce pollutant concentrations. 


Work load: 

  • Emission calculation of traffic
  • Dispersion calculation for the city of Linz
  • Source apportionment studies at different reference points