Levels of volatile organic compounds at a Drax facility in Mississippi breached air pollution rules.
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Mississippi
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Video caption: The surprising story of the Mississippi, a river that unites the USA. The surprising story of the Mississippi, a river that unites the USA. From frozen waterfalls to time-travelling barges, the Mississippi connects a continent like no other river.
By Paul Rincon
Science editor, BBC News website
By Paul Rincon
Science editor, BBC News website
By Jane Wakefield
Technology reporter
By Megha Mohan
Gender and identity correspondent
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Video caption: Former Mississippi Governor Ray Mabus says 'it's never too late' In the wake of anti-racism protests, the former Governor of Mississippi says he regrets not doing more.
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Video caption: Almost 200 dogs saved from Mississippi puppy farm The Tunica Humane Society found 102 dogs in one building and 90 more dogs outside in makeshift cages.
By Ritu Prasad
BBC News
By Paul Rincon
Science editor, BBC News website
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Video caption: Tornadoes leave buildings flattened in US south A school in Louisiana was flattened after dozens of tornadoes tore through several US south-eastern states.
By Dhruti Shah
BBC News, Washington DC
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Video caption: Donald Trump mocks Beto O'Rourke after he quits US presidential race President Trump ridicules the Democratic presidential hopeful hours after he ended his campaign.