Study finds ultra-fine aerosol particles produced by industrial activity help storms grow bigger and more intense in the Amazon basin. Scientists had long assumed that these microscopic particles—1,000 times smaller than the width of a human hair—were too small to have any effect on the weather.

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Study finds ultra-fine aerosol particles produced by industrial activity help storms grow bigger and more intense in the Amazon basin. Scientists had long assumed that these microscopic particles—1,000 times smaller than the width of a human hair—were too small to have any effect on the weather.