81.   During the summer the capital has high levels of photochemical pollution due to consistent periods of sunshine with harmful ozone levels throughout the year.

82.   Ecologists launched a publicity campaign against the mayor and government two weeks ago when air pollution reached peak ozone levels and no action was taken to regulate traffic circulation.

83.   France is also wrestling with what to do about high ozone levels.

84.   Greenpeace activist Karsten Smid said the group believed increasing ozone levels caused by auto exhaust are leading to more asthma cases and other illnesses.

85.   It also tracked days with unhealthy and very unhealthy ozone levels.

86.   Ozone levels also violated federal standards in Houston, Phoenix, Denver and Salt Lake City.

87.   Record-breaking lows in ozone levels persist in parts of the northern hemisphere, the world meteorological agency said Tuesday.

88.   State and federal officials are now debating proposals to impose such measures when ozone levels get dangerously high.

89.   The association recommended tougher pollution standards for electric power plants and heavy industry and greater investment in public transportation to help reduce ozone levels.

90.   The health hazard to children is also higher because they spend more time outdoors in the summer when ozone levels are higher, she said.