Concentrations of the gas, which is produced by burning carbon-based fuels, have decreased since 2000.
Image of the Day Atmosphere
Fires
Dust and Haze
This image, made with data from the Terra satellite, shows high levels of carbon monoxide over western Russia during the first week of August 2010.
Image of the Day Atmosphere Dust and Haze
Smoke and carbon monoxide are among the mixture of emissions lofted into the air and carried offshore.
Image of the Day Atmosphere Land Fires Human Presence Remote Sensing
This series of images shows high concentrations of carbon monoxide moving across the United States from the Wallow Fire in eastern Arizona between June 3 and June 6, 2011.
Atmosphere Dust and Haze