I want to know the answer to the following question:
How many months of washing did a 1999 study look at?
All the background I'm provided with is that "In 1999, a study of the effect of washing on the formaldehyde levels found that after 6 months after washing, 7 of 27 shirts had levels in excess of 75 ppm, which is a safe limit for direct skin exposure.". Is that enough to answer the question?
Answer: yes