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 …

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

Fine-particle pollution associated with winter haze threatens the health of more than 400
million people in the North China Plain. Sulfate is a major component of fine haze particles …

Soluble transition metals in particulate matter (PM) can generate reactive oxygen species in
vivo by redox cycling, leading to oxidative stress and adverse health effects. Most metals …

The clean air actions implemented by the Chinese government in 2013 have led to
significantly improved air quality in Bei**g. In this work, we combined the in situ …

pH is an important property of aerosol particles but is difficult to measure directly. Several
studies have estimated the pH values for fine particles in northern China winter haze using …

Aerosol acidity plays a key role in secondary aerosol formation. The high-temporal-
resolution PM 2.5 pH and size-resolved aerosol pH in Bei**g were calculated with …

Particle acidity affects aerosol concentrations, chemical composition and toxicity. Sulfate is
often the main acid component of aerosols, and largely determines the acidity of fine …

A vast area in China is currently going through severe haze episodes with drastically
elevated concentrations of PM 2.5 in winter. Nitrate and sulfate are the main constituents of …

Sea spray is one of the largest natural aerosol sources and plays an important role in the
Earth's radiative budget. These particles are inherently hygroscopic, that is, they take-up …