Concentration(PPM)

UV-A(2.0 mW/cm2)

UV-B(0.5 mW/cm2)

Sunlight

25

0.039

0.045

0.185

50

0.087

0.099

0.221

75

0.110

0.126

0.242

100

0.142

0.143

0.386

Table 1 (a): Generation of singlet oxygen in benzo (a) pyrene on exposing in UV-A, UV-B, and Sunlight for 1hr.