Ahead of his 75th birthday, A. R. (Ravi) Ravishankara, Professor in the Departments of Chemistry and Atmospheric Science at Colorado State University, ...

Explore news and insights on climate change, environment policies, global warming and sustainable practices with The New York Times Climate and Environment section.

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Scientific American is the essential guide to the most awe-inspiring advances in science and technology, explaining how they change our understanding of the world and shape our lives. Skip to main ...

Three mathematical models of air quality (CMAQ, CMAQ-MADRID, and REMSAD) are applied to simulate the response of atmospheric fine particulate matter (PM2.5) concentrations to reductions in the ...