The Department of Natural Resources in Wisconsin monitors air quality in the state. Ozone is a major component of smog and high temperatures also contribute. The summer maximum daily ozone (ppm) and temperature for 23 Wednesdays during the summer of 2011 and 2012 are

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Temperature 79 93 62 75 69 78 70 98 74 82 77 84 max Ozone 56 69 43 53 43 44 26 75 42 49 36 60 Temperature 91 70 69 93 85 93 102 82 81 80 96 max Ozone 48 40 41 58 56 87 76 63 48 45 79