sentence: `` Despite an increase in vehicle miles driven and energy consumption , surface ozone has declined by 25 percent on average across the U.S. from 1980 to 2012 -LSB- ... -RSB- However , the future of ozone air quality in the U.S. and around the world will depend on local emissions , the use of pollution control technology , regulations , and air quality policy . ''
question: what _ _ surfaced _ _ _ ?
answers: ozone