(a) the ratio of concrete infrastructure like roads, buildings, bridges, lanes etc. to total green area in the metropolitan cities;
(b) whether there is any regulation to monitor the prescribed green area ratio in the urban areas and if so, the details thereof;
(c) whether the said ratio is being maintained properly and if so, the details thereof; and
(d) if not, whether the Government proposes to make any compulsory provision to maintain the specific ratio of plantation vis-à-vis concrete infrastructure in the urban areas?