61.   Pollution levels dropped below warning levels, although health officials said hospitals would remain on alert throughout the weekend.

62.   A pollution level that may trigger a reaction in one person may be fine for another, experts say.

63.   About one in every five people is thought to be exposed to pollution levels above the minimum standards required by the World Health Organization, the report said.

64.   Air pollution level improves.

65.   Air pollution levels were double the legal safety limits in some Thai provinces.

66.   Air pollution levels in Turin were high, but decreasing, it noted.

67.   Air pollution levels were double that of legal safety limits in some Thai provinces.

68.   Air pollution levels in this city of four million hover near danger limits on most days of the year.

69.   Air pollution levels were double the legal safety limits in nine Thai provinces.

70.   Air pollution levels were high enough to trigger such alerts several times last summer.