Final answer:
Promoting electric vehicles and encouraging the use of public transportation would be the most effective solutions to reduce air pollution in London. Implementing stricter emission standards for industries and planting more trees are also helpful measures.
Step-by-step explanation:
The most effective solution to reduce air pollution in London would be promoting electric vehicles, as they do not emit any pollutants while being driven. This would help reduce the emissions of greenhouse gases and other pollutants that contribute to air pollution. Additionally, encouraging the use of public transportation would also help reduce air pollution, as it would decrease the number of vehicles on the road.
Another effective solution would be implementing stricter emission standards for industries, as industrial emissions are a significant contributor to air pollution. By enforcing stricter regulations, industries would be required to reduce their emissions and adopt cleaner technologies.
While planting more trees in urban areas can help improve air quality by absorbing some pollutants, it may not be as effective as the previous solutions in reducing overall air pollution levels. However, it is still a beneficial measure for mitigating the effects of air pollution.