air pollution still poses a health risk for millions of Americans. Adopting stricter national air quality standards for particulate matter and ozone would help clear the air by giving states a stronger tool to force polluters to clean up. Preserving and strengthening the current regulations for cleaner power plants, cars and trucks will also go a long way towards reducing air pollution. Ultimately, we need to transition away from fossil fuels to a clean economy that replaces dirty diesel, sooty coal and toxic oil with alternative fuels and renewable power.