41.   The study says that this pollution consists of fine particles of substances like sulfates, which can cause respiratory ailments, including lung cancer.

42.   They said that until now, no state had imposed controls on such fine particles.

43.   What remains is very fine particles of gold.

44.   When the buildings burned and collapsed, they sent into the air a cloud of very fine particles of all kinds of materials.

45.   And the death rate climbs steadily along with the number of these fine particles.

46.   Experts meeting at a pollution conference in Singapore earlier this week said the especially fine particles from the fires pose a risk of heart disease and lung cancer.

47.   He said it shows that the fine particles, and not the weather, certain chemicals or other factors, drive increases in the daily death rate.

48.   The harmful effects of pollutants such as ozone, carbon monoxide, fine particles, sulfur dioxide, nitrogen dioxide and lead are well known.

49.   The new diesel engine will produce about half the nitrogen oxide and fine particles discharged by existing diesel engines, Nissan said.

50.   The fine particles come from such sources as industrial combustion and vehicle exhaust.