197. Which of the following pollutants is absent in the emissions from a fertiliser plant?
200. From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
201. Pollution by particulate matter emission in the atmosphere does not take place during metal
203. CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.
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