A man cycles through the fog in Richmond Park on January 23, 2017 in London. [Photo/Agencies]

Areeba Hamid, clean air campaigner for Greenpeace, said: "Air pollution is a blight on London, so it is hugely encouraging to see the mayor prioritizing this issue. … But we also need to see action nationally to tackle the impact of diesel fumes on public health."

According to The Telegraph, more than 1 million London homes have wood burning stoves, and 175,000 new ones are installed each year. Demand for the stoves has jumped as customers look to pare their energy costs.