Beijing's environment authority says PM2.5 has been the major air pollutant of 2013.
Zhang Dawei with the Environmental Protection Bureau says the city has set up 35 PM2.5 monitoring stations over the last year.
"According to last year's data, Beijing recorded 176 days of level 1 and level 2 conditions, which means air quality met standards 48.2-percent of the time, or almost half the year.58 days have been recorded as heavily polluted, at levels 5 and 6. Poor air quality was recorded every 6 or 7 days."
Zhang also says air quality improved in the second half of last year due to a series of measures taken by local authorities.
Yu Jianhua is head of the Atmospheric Environment Management Office.
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