How Long Does It Take for Formaldehyde & VOCs to Off-Gas From Your Home?

An important question about formaldehyde is how long it takes for formaldehyde to off-gas in new homes and new furniture–how long will it take for levels to get back to normal? The best data I’ve seen suggests formaldehyde takes about two years to off-gas back to normal levels.

Why We Need Real-World Tests on Formaldehyde

When researching this question, I really wanted to see tests in real-world apartments. I want to understand how formaldehyde acts in real homes, not in a laboratory plexiglass container. That’s critical because sometimes people take results from sealed boxes and incorrectly apply them to our homes.


Formaldehyde VOC Chemical


For example, many articles trumpet how great plants are as purifiers. Plants do work in sealed test containers surrounded by grow lights, but real-world tests show that plants have no detectable effect on particulate pollution (1) indoors (including tests I did in Beijing). So it’s important to have real-world data.


Plant Purifier Effect Air Pollution Test

Real-Home Formaldehyde Off-Gassing Tests

Fortunately, scientists in Hong Kong did real-world tests. They tested for formaldehyde and other VOCs in homes and then compared new/remodeled homes with older apartments. The data showed formaldehyde fell 48% one year after remodeling.


How long does it take formaldehyde to off-gas new remodeled home


After two years, formaldehyde dropped to the same levels as in older homes. 

Off-Gassing Formaldehyde From Homes – Caveats

But it’s worth noting that these are home in Hong Kong. Why’s that important? Because temperature and humidity make formaldehyde off-gas faster. In Beijing or New York, this off-gassing will probably take longer.


Bottom Line: How Long it Takes to Off-gas Formaldehyde from Homes

The data suggests it takes about two years for formaldehyde to off-gas down to levels of the average home. However, higher temperatures and higher humidity may expedite the process, reducing the time taken to off-gas formaldehyde.

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Read More:

3 Things You Need to Know About Formaldehyde

Part 1: Why formaldehyde testers are fake (and why it’s actually scientific to just use your nose)

Part 2: How long it takes for formaldehyde to off-gas from new and remodeled homes

Part 3: Three data-backed ways to reduce formaldehyde and other VOCs in your home

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