I've always used a bike to go to work, but now I'm in Mexico City. Too many cars, too much air pollution. Cycling here is bad for your health.

The public bicycle sharing system is really good and cheap. Some parts of the city are bike friendly. But the air quality is just so bad. The trucks that spew black smoke continuously. The buses that have never been controlled in 50 years. The SUVs traveling at 100 km/h on the lanes reserved for buses and bicycles. All the cars idling and honking in traffic after 6PM. It's really depressing. This city would be such a beautiful city without all those cars and trucks.

Refs:

- air quality: https://air.plumelabs.com/en/year/mexico

- ecoBici: https://en.wikipedia.org/wiki/EcoBici_(Mexico_City)

- "Car ban fails to curb air pollution in Mexico City" http://www.bbc.com/news/science-environment-38840076