Dan Westervelt
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Study Links NYC Congestion Pricing Policy to Cleaner Air In Lower Manhattan
One year after NYC launched its congestion pricing policy, fine particulate pollution inside Manhattan’s congestion relief zone was 13 percent lower, according to a new analysis.
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Wildfire Smoke Returns: What to Know About This Week’s Air Quality
Air pollution expert Dan Westervelt discusses this summer’s wildfires and resulting air quality in New York City and beyond.
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June Research Roundup: Select Papers
In this month’s edition of our research roundup, we highlight a new study on African air pollution; deep Earth carbon recycling; and a Pacific cooling mystery.
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Climate School Experts on Congestion Pricing’s First Year
Three Climate School experts weigh in on the success of New York City’s congestion pricing program.
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Air Pollution Cuts in East Asia Likely Accelerated Global Warming
A new study finds that some forms of air pollution in the atmosphere have helped shade the Earth’s surface from the sun’s energy.
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Climate School Experts on the Los Angeles Fires: Causes, Impacts and Recovery
As California battles devastating wildfires, our researchers are helping to make sense of how they became so destructive, and what’s needed for recovery.
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Tackling Severe Air Pollution in Africa
An atmospheric scientist has been working to measure and mitigate a longtime health crisis afflicting much of the continent.
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How Wildfire Smoke Can Travel Thousands of Miles, and How to Protect Yourself
Columbia Climate School experts comment on the dangerous air pollution from Canadian wildfires.
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Unraveling the Interconnections Between Air Pollutants and Climate Change
Getting rid of some air pollutants might aggravate global warming. Here’s how.
COP31, the 2026 United Nations Climate Change Conference, aims to advance dialogue, strengthen consensus, and accelerate climate action on a global scale. From November 9–20, 2026 in Antalya, Türkiye, heads of state, ministers, scientists, business leaders, and civil society will gather to advance efforts in emission targets, climate finance, and adaptation and resilience. Once again, our experts, students, and global thought leaders from Columbia Climate School and across Columbia University are contributing to key events, sharing insights, and helping shape the dialogue toward ambitious, science-based solutions. Learn More
