Nearly 58 per cent of Chinese cities monitored, including Beijing, reported varying degrees of air pollution, this morning, China's Ministry of Environmental Protection said.
Of the 338 cities monitored by the ministry, 7.1 per cent, including Shijiazhuang the capital city of Hebei Province, which neighbours Beijing, reported serious air pollution, with air quality index (AQI) readings exceeding 300 as of today.
Beijing itself had lengthy bouts of smog for several weeks recently.
Moreover, the air in 9.8 per cent of cities, including Beijing, was moderately polluted, with AQI readings between 151 and 200.
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The data also revealed 28.1 per cent of the cities, including Changchun in northeastern Jilin Province, had slightly polluted air, with AQI readings between 101 and 150, state-run Xinhua news agency reported.
PM 2.5, particulate matters with a diametre smaller than 2.5 micrometres, was the primary pollutant in most of the cities, the data showed.
Many Chinese cities suffer from winter smog, triggering public concern.
The authorities have stepped up efforts to cut outdated production capacity and have dispatched inspection teams to provincial areas to supervise environmental measures taken by industrial firms.