In the 20th century, there were many heavy industrial enterprises in the City of London, and the main fuel for families and industries was coal. A large number of waste emissions make London shrouded in smog all the year round, so London is also known as the foggy city. 1952 65438+On February 4-9, the city of London was shrouded in smog. During this period and the following two weeks, the death toll reached 13000, so the smog incident in London was also listed as one of the top ten environmental pollution incidents in the 20th century.

At present, the environmental pollution in China is becoming more and more serious, with frequent smog. The most important thing in foggy weather is to protect yourself. Smog weather should minimize the time outside, and install a fresh air system at home so that you can breathe fresh air at home. My home decoration is a five-degree and five-constant fresh air system, and the effect is good.