Beijing will revive anti-pollution measures used for the 2008 Olympics for next month's Apec summit, ordering a 40 per cent cut in the output of contaminants in the capital. Five surrounding provinces and municipalities were also told to reduce their emissions by 30 per cent from November 3 to 12 as part of Beijing's desperate effort to ensure clear skies for the international gathering, state media reported. Hundreds of manufacturers in Beijing and adjacent regions were ordered to shut down weeks before and during the month of the 2008 Olympics. This time 69 big polluters in the capital will have to shut down completely for the period of the Asia-Pacific Economic Cooperation summit while 72 others will have to cut output. Coal-burning boilers will also be turned off, the Beijing Times reported yesterday, citing the municipal environmental authority. If conditions turn "extreme and adverse", more factories and construction sites will have to stand idle and government and state-owned-enterprise staff will have to alter their work schedules, the report said. Chai Fahe , deputy director of the Chinese Research Academy of Environmental Sciences, told the Legal Weekly that the authorities would respond to any "serious" pollution during the summit as if the contamination were "most serious". Apec is just over a week away and the capital's poor air quality is a major concern, with smog blanketing the city three times already this month. As the starter's gun went off for the Beijing International Marathon last Sunday, concentrations of hazardous PM2.5 particles reached 310 micrograms per cubic metre, more than 12 times the World Health Organisation's recommended safe level. Four days later, 12 of the 39 cities in the Beijing-Hebei-Tianjin area reported "severe air pollution", with Shijiazhuang's PM2.5 index the highest at 273, according to the Ministry of Environmental Protection. A reading of between 250 and 500 is considered "seriously polluted". Smog still chokes the region, with Beijing's PM2.5 reading rising from 227 on Friday to 311 yesterday. Weak winds and little rain forecast for next month will not help disperse pollutants and it is "highly likely" that Beijing will again be smothered in heavy smog, the Beijing Times reported, citing the municipal environmental authority.