AT present, 90.1 percent of the taxis in Shenzhen are electricity-driven and the air quality in the city ranked sixth in the country from January to October this year, sznews.com reported Monday.

According to a circular released by the Ministry of Ecology and Environment, the air quality in 20 cities, including Linfen, Tangshan and Xingtai, was relatively poor in the first 10 months among the 169 key cities in the country.

Haikou, Huangshan and Lhasa were the top three cities with good air quality. Shenzhen took sixth place.

According to officials of the municipal environment commission, the cumulative average concentration of PM2.5 in Shenzhen was 25.7 micrograms per cubic meter from Jan. 1 to Nov. 13 this year, which was 0.5 micrograms per cubic meter lower than that of the same period last year and was at its optimal level in the Pearl River Delta region.

Currently, Shenzhen has fully adopted diesel fuel that meets the national VI emissions standards. According to statistics, as of this October the city had eliminated 819,000 old vehicles, including 226,000 diesel vehicles.

(Zhang Yu)