“Air pollution continued to challenge the nation in 2004, 2005, and 2006. Some citiesnotably Los Angeles and Houstonmanaged to steadily cut ozone and particle pollution. Progress stalled in many other cities, slowing or eroding gains recorded earlier in the decade. For the first time, a city outside of CaliforniaPittsburghtopped one of the lists of the most polluted cityand stands on the verge of topping a second.”
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