African smoke over the Amazon

The Brazilian rainforest is one of the world's few continental regions with clean air. However, this is only true during the wet season, when the concentration of particulate matter is very low. During the dry season, it's ...

EPA moves to restore rule on mercury from power plants

The Environmental Protection Agency on Friday reaffirmed the basis for a rule that requires "significant reductions" in mercury and other harmful pollutants from power plants, reversing a move late in former President Donald ...

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