Houston chokes as smog levels rise
Los Angeles has long been the most polluted city in the US, but Houston appears poised to take over that dubious title. City officials said that Houstan has had 44 days in 1999 where ozone levels
Los Angeles has long been the most polluted city in the US, but Houston appears poised to take over that dubious title. City officials said that Houstan has had 44 days in 1999 where ozone levels