Robert Harley
It’s official: exposure to diesel exhaust harms human health. In June 2012, the World Health Organization’s International Agency for Research on Cancer (IARC) updated its rankings, shifting diesel exhaust from a probable to a known carcinogen. In addition to being a human carcinogen, diesel emissions contribute to both smog and climate change.
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Robert Harley
Recent amendments to the Clean Air Act require use of oxygenated gasoline during winter months in about forty urban areas across the United States. Generally, winter gasoline must contain 2.7 percent by weight of oxygen; California has been allowed to use a lower level, 2.0 percent. To determine the effectiveness of oxygenated gasoline in reducing carbon monoxide (CO) emissions, we designed a study to expand upon previous emission research by testing a large number of on-road vehicles.