It's not a slant that the Lung Association necessarily agrees with, and in a few instances in that article they are actually misportraying the truth. However, they are correct in saying that air pollution levels have gone down. We've done a pretty good job in North America bringing certain pollutants down over the last 20 years, but they are not yet at a level that is health protective. We need to do more.
On February 13th, 2007. See this statement in context.