1. Local and urban scale modelling (including the effects of building wakes, street canyons, urban canopy, urban energy balance)
  2. Regional and intercontinental modelling (including observational and modelling of current and future scenarios, and impacts on meeting and maintaining air quality standards)
  3. Data assimilation and air quality forecasting (including new research on focusing ground- and satellite- based observations into model outputs in creating high-resolution spatial maps of air quality, network design)
  4. Model assessment and verification (including performance evaluation, diagnostic evaluation, dynamical evaluation, and probabilistic evaluation as part of comparison of model outputs with observations)
  5. Aerosols in the atmosphere (aerosol dynamics, aerosol formation, interaction with multiphase chemistry)
  6. Interactions between air quality and climate change (observational analysis and modelling analysis of the effects of air pollution on climate and the impact of changing climate on future air quality)
  7. Air quality effects on human health, ecosystems and economy (including air quality trend assessments, cost benefit analysis of regulatory programs and their effects on air quality, human exposure and ecosystem burden, integrated modelling approaches)