Mexico City

Mexico City's Centro Historico is undergoing a broad redevelopment, which has resulted in more investment, more events, and more use. However, some there are worried that increased commercialization will tarnish the public square.

Among the installations at the Ecological Urbanism exhibit at Harvard's Graduate School of Design is a collection of smells from 200 Mexico City neighborhoods.

Once a week, car-flooded streets convert into bike- and pedestrian-flooded public parks in crowded Mexico City.

Air pollution is so bad in Mexico City that residents have less sensitivity to smells, according to a recent study.

With one of the world's higher rates of air pollution, Mexico City is cracking down on one type of emission: cigarette smoke. Smoking has been banned in all public places in the city, including office buildings and restaurants.

A look at the similarities between Los Angeles and Mexico City.