Article: Blackout gave cities a breath of fresh air

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Blackout gave cities a breath of fresh air

 

19:00 26 May 04

Exclusive from New Scientist

 

The blackout that left 50 million North Americans without power in

August 2003 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 those on a

similar hot, sunny day the year before. While there was no significant

difference in levels of pollutants associated solely with traffic, other

pollutants linked with power stations fell dramatically.

 

Sulphur dioxide levels decreased by 90 per cent, there was around half

the amount of ozone and visibility increased by 40 kilometres ...

 

Click here for the entire story:

http://www.newscientist.com/news/print.jsp?id=ns99995038