OCC Occurrence

((vehicle* or auto* or car*) near (exhaust* or fume*)) in occ

This is one of the fields contained within the Substance Identifiers and Basic Chemistry superfield (ZID) which itself is associated with the Substance Identifiers and Basic Chemistry message field (ID).

Note the use of brackets in the above search which is trying to find what chemical substances can be found in vehicle, car or auto fumes. Without the brackets the search would be conducted as:

vehicle* or auto* or (car* near exhaust*) or (fume* in occ)

For more information about the use of brackets to control how exactly your search is done, please consult the general Help Index.

Natural occurrences, whether in plants, animals or fungi are reported in this field. Natural emissions, combustion and/or pyrolysis processes are also given.