Science for Public Health and the Environment

Acid rain is recognized for its impacts on human health and ecosystems, and programs to mitigate these effects have had implications for atmospheric acidity. Historical measurements indicate that cloud and fog droplet acidity has changed in recent decades in response to controls on emissions from human activity, while the limited trend data for suspended particles indicate acidity may be relatively constant. Our new review in ACP reflects the efforts of an international team to synthesize knowledge on the acidity of atmospheric particles and clouds: Pye et al. (2020). (April 2020)

Zare et al. Schematic

See our paper on the role of organic nitrates in organic aerosol formation by Zare et al. in the ACS Earth Space Chemistry Virtual Special Issue: New Advances in Organic Aerosol Chemistry. (April 2020)

Hygroscopicity of organic aerosol

A set of three papers (Pye et al., 2015; Pye et al., 2017; Budisulistiorini et al., 2017) were recently awarded a 2019 EPA Scientific and Technological Achievement Award (STAA) for advancing the understanding and model representations of particulate matter in vegetated locations. The improved model is used to understand properties of ambient particles such as the hygroscopicity of organic aerosol (image: Pye et al., 2017) which affects how particle interact with light. (March 2020)

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