In the 1990’s Mexico City was named the most polluted city in the world. Birds struggled to survive. It was a wakeup call for Mexico City, and 20 million people’s lives depended on it. Since the 1990’s Mexico City has cleaned up their act reducing their high ozone days by almost half of what they had two decades ago. Changes such as; “Don’t Drive Days”, rooftop garden’s, development of public transportation and “Cycle Sundays” have all contributed to the improvements. … Continue reading






