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
• Trip facilitator rushed round island showing awful precipitation
• Cops break into a shower, which makes for a bad atmosphere
• A police department is ahead of that shower that's a danger to the environment
• Kind of electricity I use up, as result of pollution falling
• Pollution I found in a cold outlet pipe
• Following a Spanish hero, I hurried round to find cause of pollution