The correct answer to this open question is the following.
This is my blog post.
Hi friends,
Today I am visiting beautiful México City. It is a wonderful and beautiful city that combines prehispanic traditions, colonial times, and the modernity of a city that grows and prospers.
However, pollution is a major issue for the people who live in this beautiful city.
Pollution in México City is affecting the city as pollution issues are affecting US cities such as Los Angeles, Houston, and other large US cities.
The problem with México City is that it is located in a large valley surrounded by mountains, so air pollution can' be easily removed by air.
Local authorities are working on this issue by implementing a daily program called "Not Today."
The automobile plates include a color. Vehicles with yellow color cannot circulate on Monday. The ones that have pink color cannot circulate on Tuesdays, and so forth.