Application of dispersion models for development of atmospheric pollution management zones in Riga agglomeration

Almost in all European countries air quality models are used for regulatory purposes - issuing emission permits, cases studies for environmental impact assessment, analysis of future development and planning. Directive 2008/50/EC (into force from 11 June 2008) regulate that air quality status should be maintained where it is good and improved if necessary. Riga municipality has monitored air pollution in Riga and nearby areas for more than 10 years and results showed necessity to regulate pollution, particular nitrogen dioxide (NO₂), particulate matter (PM₁₀) and benzene because of too high concentration. Air dispersion model was applied to develop atmospheric pollution management zones for NO₂, PM₁₀ and benzene. This was 4th time when NO₂ zoning is applied for Riga (previous in years 2004, 2007, 2010), but first time for PM₁₀ and benzene. One of the actions showing roadmap for air quality improvement consist of revision of emission data and sources data base, and further modelling in order to identify hot spots for further actions.