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Effects of Photochemical Smog Photochemical smog's effects cause damage to the respiratory system and environmental systems with the release of nitrogen oxide (NO), ozone and volatile organic compounds (VOCs).
For the same process applied to metal, see Photochemical machining. Photolithography, also termed optical lithography or UV lithography, is a process used in microfabrication to pattern parts of a thin film or the bulk of a substrate.It uses light to transfer a geometric pattern from a photomask to a light-sensitive chemical  photoresist , or simply resist, on the substrate.or the same process applied to metal, see Photochemical machining. Photolithography, also termed optical lithography or UV lithography, is a process used in microfabrication to pattern parts of a thin film or the bulk of a substrate.