Beginning in April 2016, India will not allow commercial trucks that are more than 15 years old on the road. This is an attempt by the Indian government to limit air pollution, as India is home to 13 of the 20 most polluted cities on the planet. Commercial vehicles, particularly when badly maintained, are one are the largest contributors to air pollution nationally. Pollution causes more than 600,000 premature deaths each year. Recognition of the problem has grown in recent year due to the smog that covers multiple cities but coordination and enforcement have struggled to keep up. People are buying cars faster than any time in the past three years—in October nearly 200,000 new cars were purchased. In New Delhi, the city with the worst pollution in India, the air quality index last week exceeded 400, a level harmful even to healthy people. During the winter, air quality is often worse because of the combination of cooling temperatures and pollution, which becomes smog. New Delhi authorities have launched monthly car-free days and “green” taxes to encourage cars to drive less in the city. Critics of the ban say that generalizing the effect of all 15-year-old vehicles is ineffectual, and that car maintenance should be prioritized regardless of the age of a vehicle. For the full story, see