Tehran

January 8, 2013, 7am PST
Cold air and windless days have trapped the fumes from millions of cars and hundreds of old factories in Tehran. The air pollution has reached such high levels that officials are advising residents to remain indoors and to avoid downtown areas.
The New York Times
July 4, 2012, 5am PDT
Tehran is known for being congested and polluted, but Elyana Javaheri credits mayor Mohammad-Bagher Ghalibaf for making the Iranian capital more livable.
This Big City
December 29, 2010, 2pm PST
Garrett Bradford of TheCityFix reviews some of the most innovative and sustainable transit systems from around the globe that made their debut over the last twelve months.
TheCityFix
December 2, 2010, 8am PST
Over the past 30 years, the overgrown Iranian capital has arrived at unhealthy levels of air pollution and traffic congestion, but with the installation of a metro, BRT system, and bike rental program seems to be heading in a new direction.
TheCityFix