1. Some thoughts on future air quality models from a WRF-Chem modeler
Tight coupling between meteorology and chemistry (model grid, advection scheme, PBL mixing, shallow and deep convective mixing)
Biogenic VOC flux modules: using high-resolution and updated remote sensing datasets, more consistency with the meteorological land-use data
Capability in simulating complex terrain and meteorology: e.g. cold pool, shallow boundary layers associated with wintertime ozone events
Improvement in photolysis schemes to handle effect of snow
Treatment of dry deposition of chemical species onto snow
Refinement of the gas chemistry schemes for industrial regions with different emission signatures than the urban areas

2. Some thoughts on future air quality models from a WRF-Chem modeler
Future inverse modeling tools for top-down emission estimates
Challenges in secondary organic aerosol (SOA) modeling: uncertainties in SOA yields, aging, dry and wet removal of SOA vapours, fragmentation…
Development of new emission inventories and tools for SOA precursors (e.g. for intermediate VOCs)
How complex SOA schemes need to be developed for the next generation air quality models?