Source:
CNNMoscow, Russia (CNN) -- The famous Moscow skyline of the Kremlin and St. Basil's Cathedral vanished Friday as a blanket of thick, noxious smoke shrouded the Russian metropolis, leaving 10 million residents with sore throats and burning eyes.
The acrid smoke, stemming from thousands of square miles of wildfires, worsened considerably in Moscow, with carbon monoxide levels climbing to five times higher than what is considered safe, according to the Russian health ministry.
People were encouraged to stay indoors, but that is somewhat impractical advice for the bustling city. Instead, Muscovites struggling to breathe reached for masks and went about their business.
The smoke even penetrated people's apartments, office buildings and the subway, providing little chance for relief. There was no immediate word on injuries. Health experts told the state-run RIA Novosti news agency the pollution levels were as dangerous as smoking several packs of cigarettes a day.
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http://www.cnn.com/2010/WORLD/europe/08/06/russia.smog/