Possible Clues:

• Form of pollution created by most of Indian cars reduced somehow
• Environmental concern, a constant international depletion of resources
• Form of pollution -- a constant one with sewer
• Pollution detected in a Channel Islands sewer
• Using air-conditioning I draw off form of pollution
• Harmful drops from out of the blue?
• Kind of electricity I use up, as result of pollution falling
• Pollutant found in a Guernsey sewer?
• Trip facilitator rushed round island showing awful precipitation
• Following a Spanish hero, I hurried round to find cause of pollution