A new indoor air-quality law aims to ensure apartment blocks are free of dangerous chemicals spread by reckless renovation work, state media has reported. The Indoor Air Quality Standard, written by the health ministry and state environmental agencies, specifies 13 chemicals, including glue fumes, which cannot be used in decorating projects, the Beijing Morning Post said. Some of these chemicals harm people's health, while others leave a lasting odour. The new law, which was submitted two weeks ago, takes effect in March. The legislation will give officials powers to put unlicensed contractors out of business. Aside from air quality, there are a range of other issues that confront homeowners and their neighbours as Beijing residents spend their rising incomes on home redecoration. Other issues include noise complaints, violations of property management rules and damage to buildings from excessive hammering or drilling. Surveys show that Chinese people consider a nice home to be their top priority, said Xu Peng, senior engineer with the China Building Decoration Association. About 750 billion yuan (HK$708 billion) will be spent on construction and remodelling this year, up from 660 billion yuan in 2001. But Mr Xu said too many of China's 250,000 contractors were unlicensed 'roadside' companies. Untrained workers do not know how to use tools or choose reliable materials, Mr Xu said. He also said they showed little respect for property managers who limit building to daytime working hours. 'They just hammer away non-stop,' he said. About 1,000 Beijing companies do not possess remodelling permits, he added. Poor building materials and shoddy workmanship allow chemical fumes and dust to spread. Ye You, the manager of a home refurbishing company in Beijing, said: 'I think rules are a good idea. The roadside operators can change the price and make it really cheap, and it's easy to be cheated. 'Our company is pretty strict. There are some whose awareness level is really low. They keep forgetting [the rules].'