Mainland environmental authorities have started drafting emissions limits for fumes in the interior of vehicles. The State Environmental Protection Administration said regulations were needed in the face of a rising number of disputes related to pollutants released by cars' interior fittings. Standards for exhaust emissions and vehicle noise exist, but standards for pollution from car interiors do not, making it difficult to settle disputes when they arise. The focus is on pollutants such as benzene, toluene and formaldehyde generated by plastic and rubber materials, carpets, paint, and glue. At the end of last year, a Beijing resident took a car dealer to court claiming the excessive level of benzene in his wife's car had caused her death from leukaemia. He asked the Chinese Interior Decorators Association indoor environmental monitoring centre to test the benzene level in the vehicle. It concluded the level was much higher than normal indoor air pollution. But Beijing's Fengtai District Court ruled against the plaintiff in April, saying air pollution standards for interiors could not be applied to cars. But it urged officials to set standards for in-car emissions. A Shanghai Environmental Protection Industry Association survey this year found 46 per cent of new vehicles, both home-produced and imported, had levels of pollutants above permitted levels for indoor air. The State Environmental Protection Administration attributed the emissions mainly to poor workmanship, and overuse of plastic, rubber, textiles and glue in vehicle interiors. According to official figures, mainland carmakers use 80kg of plastics and up to 27kg of bonding material for each car as a way of reducing a vehicle's weight. In the 1990s, manufacturers only used between 14kg and 28kg of plastic.