Yale Environment 360: For the second time this year, a million New Delhi cars will be forced to stay off the road each day for the next two weeks in an effort to reduce the citys hazardous air pollution levels. The Indian capital was ranked the worlds most polluted urban center in 2014, with smog concentrations frequently reaching hazardous levels for children, the elderly, and people with heart or respiratory issues. The Delhi decision follows a similar recent driving ban in Mexico City, where heavy smog and high ozone...