1.   American officials say the pollution comes from the government-owned plants known as Carbon I and Carbon II.

2.   A new satellite system unveiled Wednesday should provide an unprecedented picture of where pollution comes from and how it travels around the world.

3.   Considering how much particulate pollution comes from diesels, the test is clearly missing a lot of dirty trucks and buses, Baron says.

4.   Fine particle pollution comes from a variety of sources, the largest of which is coal-fired power plants, the report said.

5.   More pollution came from sewage that had been improperly connected to a storm drain.

6.   New England is especially vulnerable because its pollution comes from both local sources and windblown emissions from Midwestern coal-burning plants.

7.   Other investigators are challenging assumptions about where pollution comes from in New York.

8.   So much pollution comes here that many counties in southern New England violate ozone standards on certain days.

9.   Studies have shown that nearly half the pollution comes from dust stirred up by cars and trucks on paved roads.

10.   The pollution comes from power plants, factories, automobiles and various other sources.