Preposition: of

• 1950s: The great smogs of the early 1950s influenced him toward becoming a chest physician.

Converse of object

• reduce: Hybrid cars can reduce smog up to 90 % and can get much better fuel economy then a normal engine.

• cause: An east wind would blow smoke back into London, causing heavy smog.

• produce: In the exhaust fumes of cars it reacted readily with oxygen to produce smog, increasing the risk of asthma.

• create: The exhaust filters on red double-deckers, those icons of London streets, are in trouble for creating more smog.

Adjective modifier

• photochemical: The surface of this moon is hidden beneath a thick orange photochemical smog.

• thick: The thick smog of smoke by the evening also caused problems for many.

• urban: VOCs evaporate easily and contribute to the creation of urban smogs.

• photo-chemical: To introduce photo-chemical smog, and the four factors necessary for its formation.

Modifies a noun

• alert: Second inversion: Reason for second stage smog alert.

• chamber: A newly developed procedure to perform smog chamber runs will be employed.

• formation: To introduce the role of surface coating in smog formation.

• warning: Summer smog season commences The short hot weather spell toward the end of June prompted the first official summer smog warning.

• test: The location of the smog test is almost always the neighborhood where the car lives.

• level: Smog levels at 25 sites broke health limits [ 2 ] every day from Monday 4th to Sunday 10th August.

Noun used with modifier

• summertime: Summertime smog, or ozone, is also caused by traffic.

• summer: Summer smog season commences The short hot weather spell toward the end of June prompted the first official summer smog warning.

• winter: Far more than are actually needed they contribute in a major way to the pollution which causes winter smogs.

• data: I've developed a variety of data smog filters myself over the years.

• city: When the boom times returned, the fight faded into the city smog.