Concentrations of NOx in Sweden over three decades using dispersion modelling at local and regional scale

• We have evaluated a modelling methodology to describe ambient concentrationsof air pollutants at a local scale over large areas. The methodology has been applied toestimate NO x concentrations with a spatial resolution of 100x100 m 2 in Sweden for the period1990-2015, providing a uniquely detailed description of NO x concentrations for the country.The method is based on dispersion modelling at regional and local scale. A post-processingscheme, BUDD (Back-trace Upwind Diffuse Downwind) is used to remove the contributionfrom local sources in the regional scale concentration fields, avoiding double-counting whenconcentrations from the different scales are added. The applied method is implemented in thenew air quality modelling toolbox CLAIR, which is also used as the basis for the Swedishnational air quality modelling system SIMAIR. The evaluation indicates good agreement withmeasurements for both regional and urban background concentrations.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)

Nyckelord

air pollution

dispersion modelling

population exposure

Publikations- och innehållstyp

vet (ämneskategori)

ovr (ämneskategori)