Kind of alert (4 letters)

{ Answer }

SMOG

{ Related Clues }

Adulterated air
Air apparent?
Air condition
Air pollution
Cough cause
Ecological problem
Fog and smoke
Gray blanket
Health hazard
Inversion problem
L.A. nuisance
L.A. problem
L.A. woe
Metropolitan hangover?
Metropolitan menace
Pollution factor
Pollution ingredient
A portmanteau word
Scenery spoiler
Smoke and fog
Unwanted cloud
Urban haze
Urban pollution
Urban problem
Urban woe
Wheezer's menace
L.A. air problem
Los Angeles woe
Portmanteau pollution mixture
Problem of urban U.S.A.
Smoke-fog combo
Smoke plus fog
Some air pollution
Urban health hazard
Cause of a bad air day?
Cause of some urban coughs
Clean Air Act target
Factor in an air quality rating
Pollution that may sting the eyes
Subject of an exhaustive E.P.A. study?
It may be difficult to drive in

{ Tags }

air, alert, apparent, cause, city, concern, epa, fog, hazard, haze, health, kind, la, pollution, portmanteau, problem, smog, smoke, urban, woe, word

{ Notes }

The answer SMOG is seen frequently, appearing about once every 100 puzzles.

{ Definition }

SMOG as a noun:

1. (smog, smogginess) = air pollution by a mixture of smoke and fog