Acidity, defined as pH, is a central component of aqueous chemistry. In the atmosphere, the
acidity of condensed phases (aerosol particles, cloud water, and fog droplets) governs the …

Atmospheric oxidation of sulfur dioxide (SO2) forms sulfate-containing aerosol particles that
impact air quality, climate, and human and ecosystem health. It is well-known that in-cloud …

The acidity of aqueous atmospheric solutions is a key parameter driving both the partitioning
of semi-volatile acidic and basic trace gases and their aqueous-phase chemistry. In addition …

Air quality models have not been able to reproduce the magnitude of the observed
concentrations of fine particulate matter (PM 2.5) during wintertime Chinese haze events …

The oxidation of dimethyl sulfide (DMS) in the troposphere and subsequent chemical
conversion into sulfur dioxide (SO 2) and methane sulfonic acid (MSA) are key processes for …

The rapid mass increase of atmospheric nitrate is a critical driving force for the occurrence of
fine-particle pollution (referred to as haze hereafter) in Bei**g. However, the exact …

Discerning mechanisms of sulfate formation during fine-particle pollution (referred to as
haze hereafter) in Bei**g is important for understanding the rapid evolution of haze and for …

Sulfur and reactive bromine (Br y) play important roles in tropospheric chemistry and the
global radiation budget. The oxidation of dissolved SO2 (S (IV)) by HOBr increases sulfate …

After the 1980s, atmospheric sulfate reduction is slower than the dramatic reductions in
sulfur dioxide (SO2) emissions. However, a lack of observational evidence has hindered the …

With low concentrations of tropospheric aerosol, the Southern Ocean offers a “natural
laboratory” for studies of aerosol–cloud interactions. Aerosols over the Southern Ocean are …