anti-smog

adjective
an·ti-smog | \ ˌan-tē-ˈsmäg , -ˈsmȯg , ˌan-tī- \
variants: or antismog

Definition of anti-smog 

: designed to reduce pollutants that contribute to the formation of smog He calls for stricter inspection programs to ensure that auto antismog equipment is in working order … —Gregg Easterbrook

First Known Use of anti-smog

1940, in the meaning defined above

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The first known use of anti-smog was in 1940

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