Shanghai has had its best year on the PM2.5 front since records of the yearly average density of the city’s major air pollutant were begun five years ago.

According to a report issued by Shanghai Environmental Protection Bureau yesterday, the city also enjoyed improved water quality and better regulated discharge of volatile organic compounds by industrial enterprises last year thanks to strengthened environment law enforcement and revised regulations.

The report said 75.8 percent of days in 2017 reported an excellent or good air quality, with an air quality index (AQI) no higher than 100.