AirGradient Forum

Measurement values for the AirGradient One TVOC readings?

#81

This is an interesting idea and something worth looking into.

While it depends on the composition of VOCs, it’s common for the concentration to increase at daytime due to photochemical reactions and temperature-dependent emissions (both light and higher temperatures can lead to a higher concentration of VOCs). However, I am not sure of the absolute difference this causes in concentration - especially outdoors. Perhaps we could use a longer baseline period on the outdoor device (7+ days) to account for these diurnal patterns and set a better baseline for the indoor comparison.

Cool idea! I will look more into this and see if it’s something we can introduce.

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#82

Awesome, thanks!

I was curious about fluctuations in outdoor VOCs given your description on how photochemical reactions and temperature impact concentration, and found that there are indeed diurnal fluctuations. However, I suspect my sensor data is heavily impacted by the VOC learning offset I had, which was set to only 12 hours until recently. Nevertheless, if you think that data would be useful, I’d be happy to share the ~1 year of historic data I have.

Cheers

#83

Thank you for your comment. I am trying to find a monitor that will measure VOCs, including acute change in VOC. I’m noticing a bad smell at certain times of the day and I want to see if the VOC level changes. Can I use the air gradient for that? Sounds like the TVOC measurement is not the right one to use for this, but I’m trying to learn.

#84

Hi @Please, welcome to our community!

This question is honestly tough to answer. It depends on what causes the ‘smell’. If it’s a VOC, then the monitor should be able to notice the change. If it’s not a VOC, then the monitor might not see anything.

To learn more about VOC, these articles could be helpful to start with:

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