Which Major City Emits the Most Greenhouse Gases?

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We all know that greenhouse gases (GHG) like carbon dioxide and methane can contribute to global warming, but we may be surprised which metropolitan area releases the most GHG. A recent study of emissions in 10 major global cities found Denver, Colorado had two to five times higher emissions than the others. The remaining nine cities finished in this order: Los Angeles, Toronto and Cape Town (tied for third), Bangkok, New York City, London, Prague, Geneva, and Barcelona.

Running parallel to these findings, a 2008 American Lung Association study of U.S. cities found that Pittsburgh, Pennsylvania leads the way in short-term levels of particle pollution. "Those particles are usually comprised of ash, soot, diesel exhaust, chemicals, metals and aerosols," explains Josh Peterson. "Breathing air like this can cause asthma, heart attacks, strokes and lung cancer." Rounding out the top ten of that particular study were: Los Angeles; Fresno/Madera, CA; Bakersfield, CA; Birmingham, AL; Logan, UT; Salt Lake City, UT; Sacramento, CA; Detroit, MI; and Baltimore, MD/Washington D.C

Besides steering clear of L.A., what can you do right now?