"less than about" is not a grammatically correct phrase.
The correct expression is either "less than" or "about." For instance, "The price is less than $50" or "The temperature is about 75 degrees."
The plan calls for lower income tax rates for individuals earning less than about $70,000 a year and families earning less than about $115,000 a year.
Passengers seated there correspond to everyone who makes less than about $97,000 a year.
Bacteria that grow at temperatures of less than about 15 °C (59 °F) are psychrophiles.
American negotiators would be unhappy with anything less than about ten years.
Mean residuals of less than about 1.5 arc seconds are considered a good fit.
The women all underwent lumpectomies for tumors of less than about 1.5 inches.
Pacific waters near Antarctica have salinities of less than about 34 parts; the lowest salinities less than about 32 parts—occur in the extreme northern zone of the Pacific.
It was "not less than about £2.5bn and probably far, far more, possibly in the region of £20bn to £30bn".
He moved his ear closer, and it now sat less than about an inch from the radio.
Narrowband filters have upper and lower frequencies that are less than about three octaves apart.
Fast enhancement during evolution is found in the range of less than about 0.5 MeV.
