The history always is good at summary and ask a question so, the London at the beginning of last centuries ever also had had as same today as us " elfland " , is condition in those days how? Of the industry that the London at the beginning of 20 centuries is a black, brilliant however dusky. The industrial revolution that supports by coal lets London the factory is spread all over inside the city, the family also burns coal to warm oneself, fuliginous discharge capacity increases quickly. Soot and mist mix turned Huang Hei into color, often be in city in the sky envelop, much day does not come loose. In December 1952, london counts calm of day air hush continuously. London winter uses coal fired heating more at that time, still distributing inside the urban district have a lot of firepower power station that are main the sources of energy with coalAs a result of the action of inversion layer, gas and the contaminant such as sulfur of the carbon dioxide that coal combustion produces, carbon monoxide, 2 oxidation, dust are in city in the sky save up, caused the big mist weather that counts day continuously. According to historical data account, arrive from December 5 on December 8, number of London city death amounts to 4000 people. Change as a result of weather later, poisonous mist gradually abreaction, big mist just drops off gradually to December 10 continuously. But inside two months after this, nearly 8000 much people die because of aerosol incident at respiratory system disease. Infrequent old photograph, the mist haze miserable situation of London of the hundred England year ago