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The winter of 1994-95 , however , was one of the more unusual ones , with ozone levels at about 13 percent below normal . The US National Research Council 's Board on Sustainable Development ( 1999 ) identified water and air pollution as the top priority issues in developed countries , with ozone depletion and climate change also ranked high . " The summer of 2003 was the smoggiest in Southern California in six years , with ozone levels as much as 80 percent over the federal limit , " said Todd Campbell , policy director of the Coalition for Clean Air . Moreover , the various ARL Divisions can offer a variety of surface-tower flux instrumentation , with ozone and carbon dioxide fluxes as routine additions to the standard set of meteorological fluxes momentum , sensible heat , and water vapor . Two solardomes were used as controls , with ozone added to charcoal-filtered air to give a continuous ozone concentration of 30ppb ( O3 ( 30 ) ) .