People walk in front of St. Basil's Cathedral shrouded in smog in Moscow
People walk in front of St. Basil's Cathedral shrouded in smog in Moscow, August 4, 2010. Air quality levels in Moscow tumbled to an eight-year low on Wednesday as the Russian capital was blanketed in thick smoke from forest and peat fires, said Moscow's state agency for monitoring air pollution. REUTERS/Sergei Karpukhin (RUSSIA - Tags: ENVIRONMENT DISASTER IMAGES OF THE DAY)