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They added vinyl flooring and new appliances right before I moved in. I’m unsure about foam but I can ask. This building is from the 90s if I remember correctly.

Is 300ppb considered low? I am currently keeping the levels below 150ppb by keeping the windows all wide open which is difficult for long with the desert heat.

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Get a counter current air exchanger. It vents cool inside air to the outside along a heat conducting surface that contacts the hot outside air to the inside, with only 5-8% heat import. Here are some explainers as well as some DIY methods. https://www.youtube.com/results?search_query=make+counter+cu...

Work space is 0.37 ml/ m^3 living space is 0.1 in Germany. Translates to roughly 370 and 100 ppb over the thump.

If I'm not mistaken.

So this isn't nice, cause you touch upon the threshold. You keep an eye on it and you are aware. So you will be fine hopefully it drops further. Your body also produces this stuff, so there are urine tests I think.

It can also come from candles and cleaning agents.

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