Pollution
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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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What NYC Got Right During the Wildfire Smoke Emergency, According to an Expert
Atmospheric chemist V. Faye McNeill explains our new, smoky normal—and how to stay safe.
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The Environmental Cost of War
Daryush Nourbaha, an M.S. in Sustainability Science alum, reflects on the heavy toll of global conflict.
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Study Locates Origins of Glacier Soot Pollution in Northern India
By sampling snow from glaciers and tracking pollutants back to their source, the study reveals pathways to reduce harmful pollution in the Indian Western Himalayas.
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Why Climate Change is an Environmental Justice Issue
Climate change is a threat to everyone, but some groups—socially and economically disadvantaged ones—face the greatest risks.
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What the First Earth Day Achieved
And what we can learn from its success.
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Increasingly Mobile Sea Ice Means Arctic Neighbors May Pollute Each Others’ Waters
The movement of sea ice between Arctic countries is expected to significantly increase this century, raising the risk of more widely transporting pollutants like microplastics and oil, according to new research.
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You Asked About River Salinity and Water Pollution
A Columbia Water Center staffer answers questions about salinization and water pollution.
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In India, Dirty Air Kills as Easily in the Country as in the City
A forthcoming study of northern India suggests that people living in rural areas are as likely to die prematurely from the effects of poor air quality as those living in cities.
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
