Concentration (PPM) UV-A (2.0 mW/cm2) UV-B (0.5 mW/cm2) Sunlight 20 0.241 0.059 0.010 30 0.337 0.123 0.010 40 0.351 0.136 0.010 50 0.417 0.149 0.010 Control (50ppm) 0.972 0.135 0.010

Table 2a: Generation of superoxide in Anthracene on exposing in UV-A, UV-B, and Sunlight for 20mins.