Metra to install enhanced air filters on Chicago commuter fleet
https://www.railwaygazette.com/technology/metra-to-install-enhanced-air-filters-on-chicago-commuter-fleet/58746.article
Though it would be ideal to install high-tech air filters. But, it's not all of the railway companies that can install such devices.
So, governments should not make it mandatory to install them. Otherwise, government should financially aid railway companies to expand such filtration systems.
