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A national obligatory target will be set to limit PM 2.5 emission, which is a fine particulate matter measuring 2.5 microns or less in diameter, and monitoring and assessing measures will be introduced, Vice Minister of Environmental Protection Wu Xiaoqing said.
Traffic police have been patrolling in case of emergencies.
Environmental monitoring, especially air quality monitoring, has become a hot issue in China in the past year.
In the afternoon a presidium meeting of the CPC Congress was held at the Soviet-style Great Hall of the People overlooking the Tiananmen square.
"Both natural and human factors contributed to the lingering smog, including coal burning, pollutant emissions and unfavorable weather conditions," Wu said.
来源：资阳报