In Delhi, earlier it was mandatory to install an anti-smog gun on sites with an area greater than 20,000sqm, but now there is a modification in this provision and construction sites with an area over 5,000sqm will also need to install anti-smog guns. For every 5,000sqm increase in area, an additional smog gun will be required.  read more -  https://www.zerowasterecycler.com/air-misting-machine/