Forty multinationals are among some 4,000 firms on an air pollution blacklist released yesterday.

Top companies such as Michelin China, Sina-Mars Group APP in China, the joint ventures of Toyota and Ford, and subsidiaries of Sinopec figure on the list of the China Air Pollution Map (http://air.ipe.org.cn), compiled by the Beijing-based non-governmental Institute of Public and Environment Affairs (IPEA).

"We started collecting the records of polluters in 2004," said Ma Jun, director of the institute.