He attributed the decrease to additional government financial support and enforcement of its policies, new technology and better coordination between ministries and among cities in the Beijing-Tianjin-Hebei region, the Pearl River Delta and the Yangtze River Delta.

The government earmarked 9.8 billion yuan (1.6 billion U.S. dollars) for air pollution prevention and control in 2014 in addition to 2.5 billion in budget investment arrangements, Chen said, adding that government funds helped leverage private investment worth some 300 billion yuan.

He noted that China had managed to meet its target set in the 12th Five-Year Plan (2011-2015) to cut outdated capacity in the polluting steel, cement and glass sectors one year ahead of target, and that optimization of the country's energy structure is already in motion.

Nationwide consumption of coal fell for the first time in 15 years in 2014, when it declined 2.9 percent. Clean energy sources such as hydroelectricity, wind energy, nuclear energy and natural gas, meanwhile saw their total share in the power mix rise by 1.3 points to 16.9 percent.

Discharges of key pollutants including sulphur dioxide, oxides of nitrogen (NOx) and volatile organic compounds (VOC) have been checked, whereas vehicle emissions have been curbed by pulling heavy-polluting vehicles off the road while promoting new energy automobiles.

The next step is to further optimize the country's industrial and energy structure and cut back on discharges of air pollutants, Chen said.p Authorities will go on slashing outdated capacity this year, shut down 1,000 small coal mines, improve the quality of coal on the market, ensure stable supply of natural gas, and promote the use of clean energy and energy-saving buildings.

They will aim to reduce discharges of SO2 and NOx by 3 and 5 percent respectively, and to "strictly control" that of VOC.

Chen said efforts will also be made to improve the evaluation of governments' implementation of air pollution control measures, deepen regional coordination, step up technological research and sharpen laws and regulations in the field, to make polluters pay the "unaffordable price".

China put into force a new Environmental Protection Law this year. A daily fine system was incorporated to punish offenders and motivate companies to expedite the costly modifications needed to reduce pollutants. In cases where fined violators fail to rectify the problem, the fine can increase without limit.

Chen said environmental authorities would "bring new tools introduced in the law into full play, conduct more covert inspections and seek heavier penalties for companies guilty of illicit or excess emissions and those which forge pollution data."

Government officials who neglect their duties or abuse their power will be investigated in line with law, he said.