%Change in VOC,%Change in Ozone, Std. Error -100 -5.9 0.3 -80 -5.1 0.5 -60 -3.7 0.6 -40 -3.0 0.7 -20 -1.5 0.9 0 0 0 20 1.4 1.1 40 2.5 1.2 60 3.45 1.1 80 4.2 1.3 100 5.6 1.5