The average PM2.5 concentration in Qidong, Nantong, East China's Jiangsu province, was 24 milligrams per cubic meter in February, the lowest among 54 counties, county-level cities, and districts in the province.

Qidong, Rudong, Taicang, Tongzhou, Haimen, Kunshan, Dafeng, Binhai, Sheyang, Jiangning, Liuhe, Wujiang, Changshu and Yandu had the lowest PM2.5 concentrations in the province.

In addition, every day in February had good air quality in Qidong.