A huge steel plant - Beijing's worst polluter - has pledged to drastically cut production next summer so athletes and spectators at the Olympic Games can breathe better air. But the host city's 'comprehensive environmental plans' outlined during the bidding period took a knock yesterday when it was revealed a scheme to make all of the capital's petrol stations environmentally friendly had spluttered to a halt. Only 173 fuelling stations of the 1,442 in the city - just over 8 per cent - have fulfilled their green obligations because they claim to do so costs too much money. 'I'm not satisfied with the progress,' said environment watchdog Du Shaozhong, the deputy chief of the Beijing Environment Protection Bureau. 'We have to impose more heavy-handed measures. 'Those who don't comply with the transformation requirement could face being shut down,' he told the Beijing Daily. Fuel stations are a major contributor to the city's smog, ranked second worst after car exhaust fumes. Leaking fuel on forecourts turns into airborne pollutants after evaporation. Despite a huge public campaign to clean up fuel pumps, private owners - who run about half of the city's petrol stations - said the average 300,000 yuan it costs to implement the green upgrade was too expensive. 'There are not enough incentives for the private owners,' said Li Yu, an analyst from the China Fuelling Station Network, a Beijing-based industry consultancy. The International Olympic Committee and delegates at today's World Conference on Sport and the Environment, will take the 2008 Games organisers, Bocog, to task on the environment if pledges made are not being met. Beijing Shougang Group, China's leading steel manufacturer, pledged an output reduction of more than 70 per cent from next July to September at its Beijing factory - 17 kilometres west of Tiananmen Square - to ensure the Olympics can enjoy better air quality.