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BYLINE: KEITH ROGERS, REVIEW-JOURNAL
The EPA on Thursday made official what every Las Vegan already knows -- the valley has dirty air.
But Clark County has lots of company. Urban areas in 31 states -- counties that comprise more than half the nation's population -- failed to meet federal air quality standards.
The county was barely in violation of the Environmental Protection Agency's new, tougher standard for ground-level ozone, which helps cause smog. The county had a "basic" level of pollution, the least-serious of five designations. The Los Angeles basin, by contrast, was found to have "severe" air pollution and was the only area in the worst category.
Clark County officials now have three years to submit an acceptable plan for curbing ozone. If they fail, the county could be forced to institute tougher controls on diesel equipment and vehicles, create ride-sharing programs and require the sale of cleaner-burning gasoline during the summer.
If those measures fail to satisfy the EPA, the county…