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Weather conditions last month in Beijing were the worst over the past six years with slow wind, little rain and high temperatures, but average pollution readings were able to stay at same level as the past five years, the air pollution campaign has entered a stage of stalemate, as Chairman Mao described in his famous book 'On Protracted War'... The efforts we made have sometimes been offset by unfavorable weather, and it will take time for us to slip the leash of weather conditions to win the war.