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 …

Influenza incidence and seasonality, along with virus survival and transmission, appear to
depend at least partly on humidity, and recent studies have suggested that absolute …

Atmospheric aerosols are complex mixtures of different chemical species, and individual
particles exist in many different shapes and morphologies. Together, these characteristics …

The detailed physico-chemical characteristics of respiratory droplets in ambient air, where
they are subject to evaporation, are poorly understood. Changes in the concentration and …

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 …

Conspectus Atmospheric aerosols and fine particulate matter (PM2. 5) are strongly affecting
human health and climate in the Anthropocene, that is, in the current era of globally …

Aerosol acidity plays an important role in atmospheric chemistry. China emits large amounts
of SO2, NOx, and NH3 into the atmosphere, but aerosol acidity is poorly characterized. In …

It has long been hypothesized that acids formed from anthropogenic pollutants and natural
emissions dissolve iron (Fe) in airborne particles, enhancing the supply of bioavailable Fe to …

Chemical reactions on indoor surfaces play an important role in air quality in indoor
environments, where humans spend 90% of their time. We focus on the challenges of …

Suspended aqueous aerosol droplets (< 50 µm) are microreactors for many important
atmospheric reactions. In droplets and other aquatic environments, pH is arguably the key …