smogs

/S M AA1 G Z/
noun
  1. 1

    A noxious mixture of particulates and gases that is the result of urban air pollution.

verb
  1. 1

    To get a smog check; to check a vehicle or have it checked for emissions.

    โ€œIf the car is more than five years old, you'll have to have it smogged before you can register it.โ€

Source: https://en.wiktionary.org/wiki/smog, https://en.wiktionary.org/wiki/smogs