We have reported previously on this byproduct of combustion, carbon monoxide, that has been detected at five to seven times safe levels in Moscow due to the hundreds of wildfires burning in the country. Here is a map produced by NASA showing data from the Measurements of Pollution in the Troposphere (MOPITT) sensor flying on NASA’s Terra satellite, showing carbon monoxide over western Russia between August 1 and August 8, 2010.

The highest levels of carbon monoxide are shown in red, while lower levels are yellow and orange. Western Russia, including Moscow, sits under a broad area of elevated carbon monoxide. Areas where the sensor did not collect data during the period—probably because of clouds—are gray.
Here is a NASA video posted today of an animation showing the carbon monoxide from Russia’s wildfires spreading around the Northern Hemisphere.