Formaldehyde Home Help (expensive, house, built, years)

[Kano1977]

I recently bought a digital air quality tester for my home. The
Formaldehyde reading stays about 0.143 ppm. I am new to all this and says the safe limit should be around 0.08. I went out and bought one of those really expensive voc air purifiers which was like a grand and been running that for 2 weeks and the level has not gone down. She I be extremely concerned with the levels I am getting. I just bought this house 2 years ago was built in the 1969.

Thanks Michael