It might be a reasonable solution for the cities suffering from bad ventilation characteristics with the land-locked valley effect! However, there's always the risk of dispersing the pollution over a wider region if tall chimney stacks are used. Control at source or no emission strategies are more welcomed!

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The lowering of pollutant emissions is the best way to reduce smog over the people clogged regions of India, especially if coal is used, or other rubbish.

Ban cars from big cities, as many cities do in Europe. Change transport modes when entering cities with a car, with a park and ride system that lets folks change from car or stinking bus transport to bicycles, or electric subways.

Lowering emissions fast works fast as well, This was proven with last Corona lock do

The collaborative approaches to management of air quality in urban areas involves a variety of stakeholders that includes the public, industry and local governments. The poor air quality in urban areas is mainly due to the cumulative impact of a multitude of anthropogenic activities and emission sources (regulated and unregulated), and this is often exacerbated by topographical and meteorological conditions that do not allow dispersion of pollutants in the atmosphere. This air shed-based air quality management approach has been successfully tried in many places across the world, especially in California, United States and various parts of Canada to reduce the air pollution. This approach also play an important role in reduction of air pollution in cities like Delhi, Kanpur, Lucknow, Noida etc.