Sound implausible? But wait, look at this NASA satellite imagery of carbon monoxide levels throughout western Asia. According to the EPA, " The U.S. National Ambient Air Quality Standards for outdoor air are 9 ppm for 8 hours, and 35 ppm for 1 hour." NASA's measurements are 2 ~ 8 km above the surface, but reports in Russia have noted that CO levels were as much as 6x higher than what would be considered acceptable.
Image below from USA Today / Alexander Zemlianichenko, AP
Image from NASA, dated 8/9/2010
Image from NASA, dated 8/4/2010
Video from USA Today
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