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61 The polar regions are particularly at risk because the chemical reaction that destroys ozone is helped by their weather conditions.

62 Here we present observations of a large summer minimum in ozone concentration in the unpolluted marine boundary layer of the Southern Hemisphere.

63 The debate about the depletion of the ozone layer has been so far hampered by a scarcity of data.

64 During January, the scientists measured ozone losses of about one percent per day at some heights.sentencedict.com/ozone.html

65 Ultra-violet light sterilisers perform a similar job to ozone without so many possible side effects.

66 This would remove chlorine from the chain of reactions which destroys ozone.

67 Figure 2 b shows the differences in total ozone between the two simulations on 25 March.

68 Contours are shown only where the chemistry has depleted ozone by more than 10%.

69 Acid rain and marine pollution hurt neighbouring countries; ozone depletion and global warming threaten the entire planet.

70 Estimates of ozone depletion and skin cancer incidence to examine the Vienna Convention achievements.

71 So the ozone resides around the clock(Sentencedict.com), with an exposure time much longer up here than on the valley floor.

72 Scientists are investigating the ways in which climate changes affect the ozone.

73 But because of their longevity they are expected to go on damaging the ozone layer for decades.

74 The air in El Paso is arguably the dirtiest in Texas, violating federal standards for ozone, carbon monoxide and particulates.

75 However, ozone also participates in complex chemical reactions involving trace substances in the stratosphere.

76 Hydrocarbons also contribute both to acid rain and to ozone formation.

77 When agitated, liquid ozone reorganizes into oxygen molecules with the release of sufficient heat to vaporize all the liquid.

78 But they are thought to destroy the ozone layer, which protects the earth from the sun's rays.

79 The plan also provided for measures to protect endangered species, protect the ozone layer and increase energy conservation.

80 The night-time replenishment of ozone is presumably caused by transport of ozone-rich air from higher altitudes.

81 Vegetation indirectly created the protective ozone shield by pumping oxygen into the atmosphere.

82 Figure 1 shows the average diurnal variation of ozone and total peroxide in baseline air for January 1992.

83 This reacts with the chlorine in a similar way to ozone in the stratosphere, but more usefully.

84 They help deplete the ozone layer, allowing ultraviolet rays to cause deadly skin cancers.

85 Each month during 1991 saw average ozone levels reach new highs.

86 These then combine with other oxygen molecules to form three-atom ozone molecules, resistant to ultraviolet radiation and able to absorb it.

87 The rest of the ozone layer of management at Salomon Brothers had never really been in touch.

88 Ozone levels in October reached 340 points - four times the World Health Organization's maximum recommended exposure levels.

89 CFC is just one chemical that depletes the ozone layer.

90 Today there is general agreement that ozone is destroyed by chlorine.