Why did the great smog happen?

The Great Smog of London in December 1952 occurred due to a combination of weather conditions and high levels of air pollution. A temperature inversion trapped cold air at ground level, preventing the dispersion of smoke and other pollutants from coal burning, industrial emissions, and vehicle exhaust. This resulted in a thick fog filled with harmful substances, leading to serious health issues and thousands of deaths. The event highlighted the urgent need for air quality regulations and environmental awareness.