%Change in VOC,%Change in Ozone, Std. Error -100 -2.1 1.1 -80 -1.8 1.15 -60 -1.3 1.2 -40 -0.8 1.1 -20 -0.4 1.3 0 0 0 20 0.4 1.3 40 0.75 1.2 60 1.15 1.35 80 1.55 1.45 100 1.9 1.5