The weather in Greater London had been unusually cold for several weeks leading up to the event. Because of the cold weather, households were burning more coal than usual to keep warm. The smoke from approximately one million coal-fired stoves, in addition to the emissions from local industry, was released into the atmosphere. Increases in smoke and sulfur emissions from the combustion of coal had been occurring since the Industrial Revolution and the British were familiar with these types of smog events. At times, the smoke and emissions were so heavy that residents referred to the events as ‘pea soupers’ because the fog was as dense as pea soup. However, while the area had experienced heavy smog in the past, no event had caused such problems as the weather event in December, 1952.
......
Causes of Death
The smog-related deaths were primarily attributed to pneumonia, bronchitis, tuberculosis, and heart failure. Many with preexisting conditions, including asthma, died of respiratory distress. Many others died of cardiac distress and asphyxiation. Non-fatal health effects from the smog included short-term chest pains, lung inflammation and diminished breathing ability, damaged respiratory cells, permanent lung damage, and increased incidence of asthma attacks. It is also thought that the smog could have increased the population’s risk of cancer.
The implications of the fog were not immediately clear. It was not until the deaths peaked on the 8th and 9th of December at 900 per day that the people knew something was wrong. During the smog and for two weeks following, approximately 4,000 people were killed. Some reports indicate that death rates remained above-normal for the entire winter and it is now thought that approximately 12,000 deaths can be tied to the great smog in the winter of 1952. The death toll could be thousands higher if it were known how many died from complications of smog-related illnesses in the following months and years.
At the time, officials reported that the smog had caused the deaths of mainly the old and those already suffering from chronic cardiovascular and respiratory illness. It was later determined that only two-thirds of the original 4,000 dead were over 65 years of age. Deaths in the middle-age range of 45 to 64 years experienced death rates three times greater than normal during the event. Infants were also highly-susceptible to the pollution-laden smog and infant mortality doubled during the week of December 5, 1952.
http://images.google.com/imgres?imgurl=&imgrefurl=
http://www.eoearth.org/article/London_smog_disaster,_England&usg=__QLcVuFU_C4OCevlafxZ6P1AaSrk=&h=222&w=300&sz=15&hl=en&start=2&tbnid=Jwgk9xnr7Wz2eM:&tbnh=86&tbnw=116&prev=/images%3Fq%3Dcoal%252Bsmog%252Blondon%26gbv%3D2%26hl%3Den%26safe%3Dactive