Asthma danger zones
- Cities with sulphur-heavy gases, few trees and many anthracite or coal stoves such as Soweto and Durban.
- Along the coast. Coastal air contains many more dust mites and fungus spores than the air in the Karoo.
- Near industrial areas where unhealthy gases are released into the air. These include the oil refineries near Sasolburg and Milnerton in Cape Town and chemical plants near Durban.