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How did the London smog of 1952 affect people with heart and lung disease?

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Medical illustration of the human chest showing the lungs, diaphragm, ribs, trachea, bronchus, and bronchioles, with one lung cut away to reveal internal structures. — respiratory disease The bronchioles of the lungs are the site where oxygen is exchanged for carbon dioxide during the process of respiration. Inflammation, infection, or obstruction of the bronchioles is often associated with acute or chronic respiratory disease, including bronchiectasis, pneumonia, and lung abscesses.

The Great Smog of 1952 was a lethal environmental disaster that severely impacted public health, particularly for those with pre-existing conditions. During the five-day event, millions of Londoners inhaled a toxic mixture of sulfate particles and diluted sulfuric acid droplets, which caused significant damage to respiratory tracts.1

This exposure led to a dramatic spike in hospitalizations and deaths related to pneumonia and bronchitis. While the initial death toll was estimated at 4,000, modern analysis suggests the true impact was closer to 12,000 fatalities. The crisis was exacerbated by the fact that ambulance services were severely restricted by the dense smog, making it difficult for those suffering from acute respiratory or cardiac distress to reach medical care.1

The tragedy underscored the lethal consequences of unchecked air pollution and served as a critical turning point that eventually led to the Clean Air Act of 1956, marking a fundamental shift in environmentalism and public health policy.1