Answer:
The most effective way of reducing air pollution in Mexico City would be to reduce the number of vehicles on the roads. Mexico City has one of the world's highest levels of air pollution, with high levels of particulate matter, ozone, nitrogen dioxide, and carbon monoxide. Implementing policies such as congestion charging, increasing fuel efficiency standards, and improving public transportation can all help to reduce the number of vehicles on the road and, in turn, reduce air pollution. Additionally, investing in renewable energy sources such as solar and wind can help to reduce emissions from power plants. Finally, enforcing existing regulations regarding industrial emissions can help to reduce emissions from factories and other sources. All of these measures can help to reduce levels of air pollution in Mexico City.