31.   Heat islands can exacerbate air pollution levels and make life miserable for city inhabitants.

32.   If the pollution levels are too high, it will agree to obtain air-pollution permits that would limit the emissions.

33.   In certain cities around the world, pollution levels have been at their worst in the past four years, Demerjian said.

34.   It later decided that the pollution levels were not dropping fast enough, a reconsideration that has fueled speculation that the EPA will order some form of dredging.

35.   It registered the highest pollution levels of any in the West Valley, state records show.

36.   Most at risk are the elderly, people with respiratory problems and children, especially children growing up in urban environments where pollution levels are highest.

37.   On Hawaii, in contrast, local pollution levels seem to register almost instantly at the Mauna Loa station.

38.   Participants will include world leaders discussing measures to reduce pollution levels.

39.   Participants will include U.S. President Bill Clinton and other world leaders discussing measures to reduce pollution levels.

40.   Pollution levels in New York City will be the first target for the project, which will later expand to other cities.