The blackout that left 50 million North Americans without power last August had an unexpected benefit – the air became cleaner.
As power plants were turned down in south-east Canada and the north-east and mid-west US, levels of pollutants fell, says meteorologist Russell Dickerson. His team from the University of Maryland in College Park flew an aircraft over the middle of the blackout zone 24 hours after the power had gone down. “This was a unique opportunity to explore what would happen to air quality if power station emissions were reduced,” he says.
The team compared pollution levels over Pennsylvania with…
