Latest proposals by the Environmental Protection Agency (EPA) to curb air pollution in the US has kicked up a lot of dust. The proposals are aimed at tightening air quality standards and reducing deaths and illnesses resulting from air pollution. But US citizens are not happy. In order to breathe clean air, they will have to share a cost of US $10 billion annually. Critics argue that staggering costs apart, the proposals lack sound scientific footing.

The new regulations deal with two kinds of pollutants