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… significant progress are the goals on protection of the ozone layer, the phasing out of lead in gasoline, the MDG on … in which states took precautionary measures to control ozone-depleting substances at the time the agreement was … UNEP 2011. Integrated assessment of black carbon and tropospheric ozone: summary for decision makers. UNEP. …

… . . . . . . . . . . . . . . . 78 ARTICLE 20: STRATOSPHERIC OZONE . . . . . . . . . . . . . . . . . . . . . . . . . . . . … TO NATURAL SYSTEMS AND RESOURCES ARTICLE 20 STRATOSPHERIC OZONE Parties shall take all appropriate measures to prevent … oxide (N2O), methane (CH4), chlorofluorocarbons, and tropospheric ozone (O3) . Multilateral Environmental …

… humidity, and sunlight can result in ground level (tropospheric) ozone (Oz), the major component of smog, with its adverse … directly toxic and long lasting. Other pollutants, such as tropospheric ozone and acid precipitation, result from the …