One reason: Mexico City’s 10 million people simply won’t give up their cars.
MEXICO CITY — After a couple of days of unusually cold, windy, and rainy weather made pollution levels drop, Mexico City has faced an ozone alert since Sunday, March 13. The causes:
- March is the beginning of the hot, dry season.
- Leaders of the right-wing PAN political party won an injunction in July against Hoy no circula, the program that, for decades, forced certain cars to stay parked one day a week to reduce traffic and pollution. While the injunction really only forced changes in the program, city officials decided to cancel it almost completely, allowing more than 600,000 more cars per day on the road.



























