 Northern China will receive particular attention, as the government aims to reduce air emissions by 25 percent by 2017, compared with 2012 levels, in those areas where pollution is especially serious.According to a report published by Greenpeace and Peking University’s School of Public Health in December 2012, the coal industry is responsible for the highest levels of air pollution (19 percent), followed by vehicle emissions (6 percent).Ambient air pollution is measured by the amount of particulate matter in the air.