Which of the following best describes what led to london’s “killer fog” in 1952? a. pollution from the air contaminated the water supply which is what killed people. b. millions of coal fires and stagnant air caused toxic fumes to build up in the air. c. poor city design led to faulty ventilation in houses. d. soot from forest and wildfires in the surrounding areas blew over the city.

b. Millions of coal fires and stagnant air caused toxic fumes to build up in the air. The main cause of the coal fires, which burned at plants across England, was a weather pattern that produced cooler weather and air that did not circulate. Citizens used more heat and so more coal was burned. The post-war coal was not great quality and thereby included many toxins. The weather pattern created fog, which after it dispersed, left toxins and acid droplets to fall on the people.