Pittsburgh, Los Angeles have worst U.S. air pollution (Reuters)

[riky]

Pittsburgh, Los Angeles have worst U.S. air pollution
    (Reuters)

 

<p>You are not allowed to view links. Register or LoginReuters - Pittsburgh, a former steel-making
center once known for its sooty skies, is the worst U.S. city
for short-term particle pollution, the American Lung
Association announced on Thursday.</p><br clear="all"/>


You are not allowed to view links. Register or Login/news.yahoo.com/s/nm/20080501/ts_nm/air_pollution_usa_dc