air 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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September Research Roundup: Select Papers
In this month’s edition of our research roundup, we look at the impact of suspending U.S. embassy reporting on air quality; why two extreme heatwaves had different impacts; and how to make vulnerable populations in smaller cities more visible.
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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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Study Finds Subway Pollution Is Too High—With a Disproportionate Effect on Black and Hispanic Riders
Columbia Climate School researcher Shams Azad analyzed the air pollution on subway platforms and trains in New York City.
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Planting Some Tree Species May Worsen, Not Improve, NYC Air, Says New Study
New York is planting large numbers of trees in order to improve the city’s livability. But emissions from some species interact with tailpipe and building pollutants to form smog.
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From ‘Asthma Alley’ to Green Spaces: A Field Trip with South Bronx Unite
MPA-ESP students learned about the complex environmental justice issues at play in the South Bronx, and how community groups are advocating for change.
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The Endless Shame of Louisiana’s Cancer Alley
In a nation that invented national environmental policy over half a century ago we now see the spectacle of part of America being investigated by an international NGO seeking to protect the human rights of victims of toxic pollution.
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The Regulation of Air Pollution That Crosses State Borders
Our world and our economy are becoming more technologically complex and interconnected; anticipated impacts have become routine, and our need for agile and responsive regulation is growing.
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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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