Although progress has been made in the past year, China's environment, especially water, air and soil, faces serious challenges, according to a report on Thursday.

Harmful algal blooms in Chaohu Lake in Anhui Province. [File photo]

Officials called for improvements to the legal system, a more environmentally friendly development outlook and better institutions to protect the worsening environment.

"NOT OPTIMISTIC"

At a press conference ahead of the World Environment Day on Thursday, vice minister of environmental protection Li Ganjie quoted the report as saying that although China's environment has improved in general, water quality is "not optimistic" and air quality in cities is "serious".

In China's top 10 river valleys in 2013, about 9 percent of the water sections was class V; the worst level. Of 4,778 monitoring sites for groundwater almost 60 percent were poor or extremely poor.

Water quality offshore is not good either, according to the report, with 18.6 percent of offshore water areas only reaching class IV. Water quality in the East China Sea and in four of China's nine biggest bays was extremely poor.

As for air quality in cities, only three of the 74 monitored cities met the national standard for good air in 2013. Accumulation of air pollutants such as sulfur dioxide and nitric oxide led to acid rain which mostly affected areas along the Yangtze River, especially the southern side of the middle and lower reaches, around 10.6 percent of the nation's land.

Soil pollution and land degradation are also serious, according to Li, who added that the arable land reduced by 80,200 hectares in 2013, and a total of 295 million hectares, or 30.7 percent of China's land area, suffering soil erosion.