India, Dec. 9 -- For Delhi to tackle its rapidly deteriorating air quality, citizens and policymakers must tackle one of the biggest sources of pollution within its borders: Transport, which alone accounts for nearly 50% of all air pollution within Delhi in the winter months.

There are 53 lakh active vehicles registered in Delhi; new sales deepen transport's impact on air pollution further every day. By 2030, Delhi is expected to see a 20% rise in on-road vehicles, resulting in more congestion and rising exhaust and non-exhaust emissions. But this can, and must, be turned around. Through targeted action on BS-IV and older vehicles, and electrification of commercial vehicles, Delhi can reduce its pollution by at least 20% by 2028. This wi...