Anthropogenic emissions and land use changes have modified atmospheric aerosol
concentrations and size distributions over time. Understanding preindustrial conditions and …

Secondary organic aerosol (SOA) is formed from the atmospheric oxidation of gas-phase
organic compounds leading to the formation of particle mass. Gasoline-and diesel-powered …

Executive summary Land and climate interact in complex ways through changes in forcing
and multiple biophysical and biogeochemical feedbacks across different spatial and …

One of the least understood aspects in atmospheric chemistry is how urban emissions
influence the formation of natural organic aerosols, which affect Earth's energy budget. The …

The chemical complexity of atmospheric organic aerosol (OA) has caused substantial
uncertainties in understanding its origins and environmental impacts. Here, we provide …

Isoprene emitted by vegetation is an important precursor of secondary organic aerosol
(SOA), but the mechanism and yields are uncertain. Aerosol is prevailingly aqueous under …

We deployed a High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS)
and an Aerosol Chemical Speciation Monitor (ACSM) to characterize the chemical …

The Community Multiscale Air Quality (CMAQ) model is a comprehensive multipollutant air
quality modeling system developed and maintained by the US Environmental Protection …

We use an ensemble of surface (EPA CSN, IMPROVE, SEARCH, AERONET), aircraft (SEAC
4 RS), and satellite (MODIS, MISR) observations over the southeast US during the summer …

Organic compounds and liquid water are major aerosol constituents in the southeast United
States (SE US). Water associated with inorganic constituents (inorganic water) can …