The air is much cleaner where there are no people:
D.C. residents breathe some of the most dangerous air in the country, according to an updated Environmental Protection Agency study.
The agency ranked the District fourth behind New York, California and Oregon based upon tests in 1999 for 177 air toxins...
Agency officials said 7-year-old data was used because it is the most complete and up-to-date available. They also said the risk of getting cancer or another serious illness from breathing the toxins might now be less.
The agency said Wyoming, South Dakota and Montana had the cleanest air, but could not readily provide information for Maryland and Virginia yesterday.