Beijing authorities to close factories , reduce vehicle traffic to reduce pollution . Emergency measures come into effect after `` three consecutive days '' of smog . The government has been trying to get the situation under control for a while now Environmentalists say plan must involve more than one city .
Beijing authorities to close factories , reduce vehicle traffic to reduce pollution . Emergency measures come into effect after `` three consecutive days '' of smog . China 's capital has symbolized the environmental cost of economic growth . Environmentalists say plan must involve more than one city .