What caused thelarge rise in asthma?One hypothesis is that people no longer get as many infectionsin childhood,making them more susceptible to allergic diseases such as asthma.

Despite improvements in air quality throughout the twentieth century, most Americans believe we have made no progress on air pollution--or even that air pollution has been getting worse.

State of the Air is designed to generate alarming headlines rather than provide the media and the public with accurate information on air pollution.

Is the Union of Concerned Scientists misleading the public when it comes to air pollution and air quality?

Environmentalists, regulators, health scientists, and journalists create the appearance that harm from air pollution is much greater and more certain than suggested by the underlying evidence.

Activists continue to present misleading accounts of air quality issues despite the decline of ozone smog levels.

During the last thirty years,most of the country has had several years that were cooler or wetter than 2004, but never have smog levels been anywhere near this low.

Though air quality continues to improve, those gains have come at the cost of devoting resources to creating administrative requirements, rather than reducing pollution.