Why is London not called foggy city nowadays?

The perception of London as the "foggy city" has indeed diminished over time. While the city was historically known for its frequent fog, several factors have contributed to the decline in fog formation in recent decades:

1. Clean Air Acts: The implementation of the Clean Air Acts in the 1950s and 1960s aimed to reduce air pollution and improve air quality in the UK. These regulations targeted the reduction of emissions from coal-burning, which was a significant contributor to fog formation.

2. Shift from Coal to Natural Gas: London's transition from using coal as the primary fuel source to natural gas for heating and industrial processes led to a decrease in emissions of particulate matter and sulfur dioxide. Natural gas produces fewer pollutants and results in cleaner air.

3. Weather Patterns: Changes in weather patterns and climatic conditions have also influenced fog formation in London. The frequency of conditions that favor the development of fog, such as high humidity, low wind speed, and temperature inversions, has decreased in recent decades.

4. Improved Urban Planning: Modern urban planning practices, including the creation of green spaces, wider roads, and better ventilation in urban areas, have contributed to the dispersion of pollutants and reduced fog formation.

As a result of these factors, the incidence of dense fog has significantly decreased in London, and the city is no longer commonly referred to as the "foggy city."