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The original was posted on /r/science by /u/Wagamaga on 2025-04-21 15:53:48+00:00.

Original Title: Canadian Wildfire Smoke Cooled New York by 3 Degrees and Trapped Air Toxicants. Smoke particles, which traveled nearly 1,000 kilometers from Canadian wildfires, produced an unprecedented direct radiative forcing of - 352.4 watts per square meter at ground level.