Which city, formerly named the most polluted on the planet, made drastic changes, such as banning cars in some areas, to improve environmental quality?

a. Mexico City
b. Hong Kong
c. London
d. New York City
e. Tokyo

a. Mexico City

The city that formerly named the most polluted on the planet and made drastic changes, such as banning cars in some areas, to improve environmental quality is option a. Mexico City.

The city that was formerly named the most polluted on the planet and made drastic changes to improve environmental quality is option a. Mexico City. To find the answer to this question, you would need to have knowledge or search for information regarding cities that were once highly polluted and have implemented measures to improve their environment. Mexico City is widely known for its struggles with pollution and has implemented various measures over the years to combat the issue, including banning cars in certain areas, improving public transportation, and implementing strict emissions standards.