EPA proposes cuts to ozone emissions

Environmental Protection Agency Administrator Gina McCarthy testifies at an oversight hearing of the Senate Environment and Public Works Committee on Capitol Hill in Washington on July 23, 2014.

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After a long delay, the Obama Administration proposes cuts to Ozone emissions by about 7 to 13 percent

The Environmental Protection Agency has announced plans to tighten up a key air standard for ozone - one of the main culprits in smog.

It's an issue that the Obama Administration walked away from three years ago and today's move sets the stage for a likely battle with Republicans in Congress.

Business groups argue it could be one of the costliest regulations of all time but public health officials say ozone is a major pollutant and that a reduction could help curb cases of asthma and other lung disorders.

Southern California Public Radio's environment reporter Molly Peterson has looked into the pros and the cons - and she says the proposed cuts would reduce ozone by about 7 to 13 percent, but that to do so can be really complicated.