Fifty-one areas in the country don’t meet 2015 ozone standards, the EPA announced May 1.
This includes counties in Indiana and Wisconsin that the states had asked the Environmental Protection Agency to reconsider as meeting ozone standards.
The EPA also granted California’s request that six nonattainment areas be voluntarily reclassified into a more severe ozone classification that requires additional pollution controls for sources.
This means all regions except San Antonio know how their air quality stacks up against national standards, and the extent to which air agencies need to control pollution from sources including coal-fired power plants, factories, and vehicles. ...