A serious air pollution incidents. In December 1952 in London. Generated by the coal dust, sulfur dioxide mixed with the fog enveloped the ground, and have mist form, as long as four days, so that the public place chest tightness, cough, sore throat, shortness of breath and other symptoms. The same period in previous years the number of deaths increased by about 4000 people. 1956, 1957 and 1962, another spate of similar incidents of smoke.
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No. 2
December 1952, almost paralyzed the traffic in London, the first 4 days in a smoky, fog lights by means of a double-decker bus can only drive slowly in the urban areas. 1952, London police used the burning torch in order to be able to see other people smoke, and can be seen. Known as the world's "fog," said London, when the turn of spring and autumn, there is often shrouded Nongwu, like put a layer of mystery. According to statistics, the London fog, up to seventy to eighty times a year, an average of 5 days, there being a "fog." When the fog comes, the fog filled not only the impact on traffic, causing accidents, but also directly harm people's health and even threaten people's lives. Compared with the situation in 1952, today's London is a clean city. At that time, London coal-fired power plants, not far from the city center has many factories. Most homes use coal for heating. Coal-powered steam locomotive pulling the train entered the capital of a steadily. On the emissions generated by cars and trucks almost no control measures. December 4, 1952, there was a City of London the world's most severe "smog" events: a continuous dense fog that lingers for nearly a week, factories and households discharge a lot of smoke and gas accumulation in low, thick fog the entire city enveloped, caught in a gray. Period, 4,700 people died due to respiratory disease; there are more than 8,000 people killed after the fog lifted. This is what shocked the world "fog catastrophe." December 3, 1952 early morning, the London weather station reported that a peak in the night air by noon, the temperature can reach 5.6 ℃, relative humidity of about 70%. For local, this is a rare good day - a lovely winter day. On this day, gust of wind blowing from the North Sea, blowing the whole of England, the British central factories and households in urban residents came out of the chimney blew clouds of fog cloud nine, so the air becomes very fresh and pleasant. However, who would not think of a disaster is quietly coming. In the evening, London is in a huge high pressure cyclone in the southeast edge of the strong northerly winds over the anti-cyclonic clockwise around blowing. The next day, December 4, the cyclone center to the west of London has a few hundred kilometers to the southeast along the usual path of movement. Smaller the morning wind, clouds covered nearly the entire sky. Am to noon, dark clouds cover the sun all, diffuse clouds over London, weather thermometer reading is 3.3 ℃, relative humidity increased to 82%. December 5, an unusual situation has emerged. London observatory measured the wind speed tables measure of a very strange - speed reading is completely static. Experts estimate that time, when winds of not more than 3 kilometers per hour. London in the dead wind conditions, the air a great deal of smoke and dust accumulation, durable ghost, the wind is too weak and can not take away forest of factory chimneys and families of various harmful exhaust fumes. So have a lot of soot falling from the sky, the beautiful Thames Valley has been shrouded in haze. Work on board a small apprentice, that he burst into tears invasion smoke; smoke through the door comes in, got into the home of Greenwich residents, so that people suffering unbearable ... ... Fog cloud over the city suspended for 5 days, and gradually get even dirtier and more toxic. Smoke in the air in central London increased by almost 10 times the amount. Thousands of victims suffering from smoke bronchitis, asthma and other diseases of the lungs. Finally, to December 10 when the smoke dispersed, an estimated 4,000 people died, most of them elderly. Today, smog is the main cause of motor vehicle emissions of pollution. Like Los Angeles, Mexico City and other large cities, the smoke has been suspended in the air. Locomotives using unleaded petrol and catalytic converters installed to help reduce pollution and damage to health by this risk. However, this is still a serious problem to be solved.
