An Air Force spokesperson was responding to reports that Chinese warplanes flew over the South China Sea, Bashi Channel and Miyako Strait.
The country had 1.003 billion people of working age in 2015, which will gradually decline to 827 million in 2050.
The move is aimed to ensure independent and fair project environmental reviews, the Ministry of Environmental Protection said.
Beijing's lawmakers are considering listing smog as a meteorological disaster, but the move has been questioned, as smog is not seen as naturally occurring.
A red alert will be issued if the Air Quality Index is forecast to exceed 400 over the next 24 hours, lower than the previous level of 450.
Beijing-Tianjin-Hebei region is targeting a reduction in the concentration of PM2.5.
Over 200 people linked to a Chinese criminal network have been arrested in their joint operation, Spanish and Chinese police said.
A county government in Liaoning province was found to have hidden the real number of deaths after a heavy flood in 2012.
Yang Weize, former Party chief of capital of Jiangsu province, was sentenced to 12 years and six months behind bars for taking bribes worth 16.4 million yuan (US$2.4 million).
Parents also demand authority's apology to recover son's reputation.