Concentration(PPM)

UV-A(2.0 mW/cm2)

UV-B(0.5 mW/cm2)

Sunlight

25

0.210

0.201

0.701

50

0.124

0.195

0.684

75

0.373

0.392

0.892

100

0.600

0.412

0.876
Table 1 (b): Generation of singlet oxygen in pyrene on exposing in UV-A, UV-B, and Sunlight for 1hr.
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