Beijing authorities to close factories , reduce vehicle traffic to reduce pollution . These measures come into effect after ` ` three consecutive days '' of smog . ` The air pollution in Beijing is mostly transmitted from other cities , and what Beijing can do is very limited . China 's capital has raised the environmental cost of economic growth . Environmentalists say growth must involve more than one city .
Beijing authorities to close factories , reduce vehicle traffic to reduce pollution . These measures come into effect after ` ` three consecutive days '' of smog . China 's capital has raised the environmental cost of economic growth . Environmentalists say growth must involve more than one city .