Crews from Ramsey and Huntingdon were called to a large quantity of unknown rubbish well alight next to a derelict building at RAF Upwood.
Firefighters wearing breathing apparatus used a hose reel to extinguish the fire and returned to their stations by 5.03pm.
Cause of the fire was deliberate.
Anyone with information should contact police on 101 or call Crimestoppers anonymously on 0800 555 111.
Cyclist seriously injured in Cherry Hinton collision
A 45-year-old woman has been seriously hurt in a bike crash in Cherry Hinton
Woman in critical condition after five-car crash on A14
A woman is fighting for her life following a five-car pile-up near Newmarket.
Fears Cambridge market could shrink following revamp
Traders fear £12.6m plans to upgrade Cambridge Market Square will result in it shrinking.
Woman found dead in Little Shelford
A man has been arrested after a woman was found dead in Little Shelford.
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