%Change in VOC,%Change in Ozone, Std. Error -100 -4.3 0.4 -80 -3.6 0.5 -60 -2.8 0.6 -40 -2.1 0.7 -20 -1.0 0.7 0 0 0 20 0.7 0.9 40 1.6 0.9 60 2.65 1.05 80 3.05 1.05 100 3.9 1.1