OZONE AND HEALTH Source: Stratospheric Ozone, NASA/GSFC Absorption Cross Section 10 60 10 510 18 50 10 40 o。*10 10 200 250 275 300 350 30是 Wavelength(nm) Solar flux 20 00 Top of the atmosphere 10 10.0 10 0369 DNA Action spectr M ixing Ratio Surface (ppmv) 12 300 320 Wavelength(nm) 90% of O3 is in the stratosphere; O3 layer with max w 9 ppm Absorption of n= 200-320 nm(UV-B and Uv-c)by strat O3OZONE AND HEALTH • 90% of O3 is in the stratosphere; O3 layer with max ~ 9 ppm • Absorption of  = 200-320 nm (UV-B and UV-C) by strat. O3 Source: Stratospheric Ozone, NASA/GSFC