Ultraviolet radiation

Ultraviolet Radiation in Polluted Environments

Measured and calculated actinic flux

Photochemical smog is a byproduct of the NOx-catalyzed oxidation of volatile organic compounds (VOCs) under solar ultraviolet (UV) radiation.  While the chemical regime can be NOx-limited, VOC-limited, or NOx-inhibited, it is always photon limited and therefore sensitive to changes in the UV radiation field.  In polluted regions, these radiation changes can be caused by the smog itself, especially ozone (O3), nitrogen dioxide (NO2), and aerosol particles.

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