11.   The pollution comes with a price.

12.   Ultimately, they hope to be able to warn New Englanders that pollution is coming before they start breathing it in.

13.   Long-term pollution could come from the breakdown of the geological structure, the release of radioactivity and concern about accidents.

14.   Most pollution comes from automobile exhaust and dust from construction sites.

15.   Pollution comes from moving objects, like cars and static objects like factories, household activities and garbage.