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Official

Current Standard Unchanged Since 2008

Like a certain Hobbit, the Environmental Protection Agency (EPA) wants to take a closer look at Smaug. Sorry, smog. The EPA is on a bit of a kick in thinking about cleaner air standards, which makes sense since the winds of change are blowing. Europeans are taking a closer look at diesel emissions and health organizations are understanding just how bad exhausted air can be (think more asthma and cancer).