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A prospective renter in a newly built Los Angeles apartment reported higher consumer-monitor readings for total volatile organic compounds and formaldehyde after keeping the windows closed for about 48 hours. The measurements and persistent odor are reasons to seek qualified advice if concerned, but the device is not laboratory-grade and the readings alone do not establish the apartment’s true concentrations or a health risk.
A prospective renter in a newly constructed West Hollywood-area apartment reported higher readings for total volatile organic compounds and formaldehyde after closing the windows for about 48 hours, prompting a question to GreenBuildingAdvisor about whether professional testing is warranted. The readings came from a Temtop LKC-1000S+, which the renter said is not laboratory-grade, so they do not by themselves confirm the apartment’s pollutant levels or indicate whether the space poses a health risk.
The renter said the building had been completed a few months earlier and had a noticeable chemical or new-construction smell during an initial tour. Before moving in, the renter kept the windows open for roughly three weeks and arranged post-construction cleaning, HVAC duct cleaning and a brief period of air scrubbing. Those steps did not eliminate the odor when the windows were later closed.
With the windows open, the monitor showed TVOC of 0.05 mg/m³ and formaldehyde, or HCHO, of 0.01 mg/m³. After about 48 hours with the windows closed, the renter reported TVOC around 0.38 mg/m³, with a peak near 0.45 before settling around 0.36, and HCHO at 0.08 mg/m³, which the renter estimated as about 65 parts per billion. Reported PM2.5 fell from 3.7 to 2.1 micrograms per cubic meter during the same comparison.
The post did not provide independent laboratory results, details about the monitor’s calibration or operating conditions, or measurements from other rooms. It also did not identify which chemicals, if any, were responsible for the reported TVOC signal or the smell. The figures are therefore the renter’s device readings, not verified measurements of specific compounds.
Why Indoor-Air Measurements Matter
The report highlights a practical problem for people moving into new homes: a noticeable odor and a changing consumer-monitor reading can prompt concern, but neither alone identifies a pollutant or establishes the level of exposure. A device reading can be useful as a reason to ask questions, yet it is not a substitute for a method suited to the substance being investigated.
That distinction matters because the renter is deciding whether to move in, continue ventilating or pay for testing. Treating an unverified number as a diagnosis could lead to unnecessary alarm, while dismissing a persistent concern without better information may leave the renter unsure how to proceed. The source material does not establish a health outcome or show that the apartment exceeds any applicable standard.
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How the Readings Were Collected
The renter compared measurements under two reported conditions: windows open for an extended period and windows closed for about 48 hours. The readings changed between those conditions, but the post does not state whether temperature, humidity, ventilation equipment, measurement location or other conditions remained constant. It also does not provide a laboratory comparison for the Temtop monitor.
The renter described the device as not laboratory-grade and specifically asked how much confidence to place in its formaldehyde result. The post also asked whether ordinary ventilation was sufficient and what sampling approach would make sense for an apartment. No industrial hygienist’s assessment, professional testing recommendation or expert response was included in the source material, so those questions remain open rather than answered by the report.
“The chemical/new-building smell was still noticeable after those 48 hours with the windows closed.”
— The apartment renter, in the GreenBuildingAdvisor question
What the Monitor Cannot Confirm
The source does not establish whether the reported formaldehyde or TVOC values accurately represent concentrations in the apartment. It provides no independent test, calibration record, sampling protocol or information about how the device responds to individual compounds. A TVOC reading is a combined indicator, not a list of identified chemicals; the source gives no analysis identifying the substances behind the odor.
It is also unclear how representative the readings are of normal occupancy or what conditions were present during each measurement. No professional has assessed the unit in the information provided, and there is no documented comparison with a cited health guideline or regulatory limit. The renter’s health anxiety is part of the account, but it neither confirms nor rules out an environmental issue.
Testing and Advice Still Pending
The source material does not say whether the renter obtained professional testing or moved into the apartment. The next step described in the post is a request for advice from readers, industrial hygienists and indoor-air-quality professionals about whether testing is justified and which residential sampling methods would be appropriate.
Until such advice or test results are available, the reported device figures should remain attributed to the renter rather than treated as confirmed indoor-air measurements. Any decision to test would need to address the specific question being asked, including which pollutant to measure and under what conditions. No sampling method, result or expert recommendation is confirmed in the report.
Key Questions
What readings did the renter report?
With windows open, the renter reported TVOC at 0.05 mg/m³ and formaldehyde at 0.01 mg/m³. After about 48 hours with windows closed, the reported values were around 0.38 mg/m³ for TVOC and 0.08 mg/m³ for formaldehyde. These were readings from the renter’s consumer monitor, not laboratory-confirmed results.
Do the numbers prove the apartment is unsafe?
No. The source provides no laboratory test, expert assessment or comparison with a cited standard. The reported numbers alone do not establish the apartment’s actual pollutant concentrations or a health risk.
How reliable was the formaldehyde reading?
The renter said the Temtop LKC-1000S+ was not laboratory-grade and asked how much confidence to place in its formaldehyde reading. The source includes no calibration information or independent comparison, so its accuracy in this case is unknown.
Was professional air testing recommended?
The post asks whether professional testing would be justified and what sampling methods to use, but it does not include an expert answer. No testing recommendation or laboratory result is confirmed in the source.
Did ventilation or cleaning resolve the odor?
The renter reported keeping windows open for roughly three weeks and arranging post-construction cleaning, duct cleaning and brief air scrubbing. The chemical or new-building smell was still noticeable after the windows had been closed for about 48 hours.
Source: greenbuildingadvisor.com
