Already during the 13th century, domestic coal consumption in London is said to have been so great that restrictive by-law became necessary to check the increasing smoke nuisance.
早在13世纪，据说在伦敦家庭煤的消耗就很大，所以必须制订限制性的地方法规来检测不断增加的烟雾污染。
2
The necessity of introducing exhaust particulate trap in domestic automotive diesels was discussed on the basis of the present exhaust smoke situation.