Progress on pollution lets everyone breathe easier

It's been four years since Premier Li Keqiang declared war on pollution. So how goes the battle? Has the government been delivering on its promise to improve air quality?

The Energy Policy Institute at the University of Chicago set out to answer the question and found that in China's most populated areas, the improvements in air quality have been "remarkable".

The improvements range anywhere from minus 21 to minus 52 percent, with most meeting or exceeding goals outlined by the National Air Quality Action Plan.