Air pollution, can we reduce the impact of cars on urban air quality?

Air quality in Delhi, India, is so poor due to vehicular pollution that it caused the city to run a 2-week experiment in January 2016: private cars were allowed on the streets only on alternate days, depending on license plate numbers. Delhi's PM10 particle levels are nearly twice that of Beijing, and its PM 2.5 the worst of 1600 cities in the world (including Iran and Bangladesh). Similar experiments have been tried in major cities in France, Italy, UK, China, all suffering public health problems (cancer, heart attacks, asthma, premature death) due to their love affair with the motor car.
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