UV exposure (dose)

10 ppm

100 ppm

500 ppm

1000 ppm

UV-A (1.4mW/cm2)

5.5

6.0

6.3

7.0

UV-B (0.4mW/cm2)

No

4.3

4.5

4.9

Dark

No

No

No

No

Table 8: Inhibition zone at different concentration of Benzo(a) pyrene on exposing to UV-A, UV-B and sunlight.