3/16/16 ABC News
Authorities banned more than 1 million cars from the roads and offered free subway and bus rides to coax people from their vehicles as Mexico City’s first air pollution alert in 11 years stretched into a third day Wednesday.
Officials advised people to limit outdoor activity due to high ozone levels that were nearly double acceptable limits in the sprawling capital, which lies in a high-altitude valley ringed by smog-trapping volcanic mountains.
Amid a muddy brown haze, some residents covered their mouths with scarves or paper masks as they moved through the streets. Some schools kept kids indoors during recess.
Environment Secretary Alejandro Pacchiano said if conditions don’t improve, further measures may be considered such as suspending industrial activity at factories.