# SDS011 humidity corrected?
**URL:** https://forum.sensor.community/t/sds011-humidity-corrected/1677
**Category:** FAQ
**Created:** [November 19, 2022, 5:28pm UTC](https://forum.sensor.community/t/sds011-humidity-corrected/1677 "2022-11-19T17:28:28Z")
**Posts on this page:** 12
**Page:** 1
### Author:  [@ohobby](https://forum.sensor.community/u/ohobby)
#### Post date: [November 19, 2022, 5:28pm UTC](https://forum.sensor.community/t/sds011-humidity-corrected/1677/1 "2022-11-19T17:28:28Z")
Hello,
does the current fine dust sensor firmware correct the values of the SDS011 humidity?
I seem to remember that it was planned many years ago, what happened to it?
Because regularly in wet weather or when there is fog, the particulate matter values and the red card is torn apart by the people (media), because the values are not correct or exaggerated.
To take the values seriously, it would be really important that a correction of the data is built.
Regards,
Oliver
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### Author:  [@pjg](https://forum.sensor.community/u/pjg)
#### Post date: [November 19, 2022, 9:40pm UTC](https://forum.sensor.community/t/sds011-humidity-corrected/1677/2 "2022-11-19T21:40:31Z")
I don‘t think it is that important. Currently SC provides raw data that can be corrected from the archives. As soon as someone provide me a clear correction I can add it in a fork of the map. But I am waiting for 3 years… If we use physical dryers, we would need a new property in the API.
The Next PM Sensor has a built in correction for example.
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### Author:  [@MichaelLazan](https://forum.sensor.community/u/MichaelLazan)
#### Post date: [November 21, 2022, 2:03pm UTC](https://forum.sensor.community/t/sds011-humidity-corrected/1677/3 "2022-11-21T14:03:41Z")
I looked up the NextPM sensor and here they say that they use physical heater.
> **[Faqs - TERA Sensor](https://tera-sensor.com/faqs/)**
>
> All the questions and answers about fines particles and the group Tera in our FAQ online. Discover more about us.
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### Author:  [@Jan](https://forum.sensor.community/u/Jan)
#### Post date: [November 21, 2022, 7:37pm UTC](https://forum.sensor.community/t/sds011-humidity-corrected/1677/4 "2022-11-21T19:37:18Z")
Dutch institute for public health uses this form to compensate for humidity. Actual values depend on location!
Related paper in Dutch:
[https://samenmeten.nl/sites/default/files/2018-07/Status\_SDS011\_12juli18.pdf](https://samenmeten.nl/sites/default/files/2018-07/Status_SDS011_12juli18.pdf)
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### Author:  [@pjg](https://forum.sensor.community/u/pjg)
#### Post date: [November 22, 2022, 11:37am UTC](https://forum.sensor.community/t/sds011-humidity-corrected/1677/5 "2022-11-22T11:37:20Z")
Where is the PM value ?
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### Author:  [@nephilim](https://forum.sensor.community/u/nephilim)
#### Post date: [November 22, 2022, 5:12pm UTC](https://forum.sensor.community/t/sds011-humidity-corrected/1677/6 "2022-11-22T17:12:35Z")
I threw a passage at deepl and this is what I got:
_The humidity correction thus fit gives then the factor by which the values of the sensors_
_should be divided, as a function of the relative humidity at Schiphol Airport._
Just found how to do this in Grafana. Let’s see if it can bring my data closer to the official PM values.
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### Author:  [@Jan](https://forum.sensor.community/u/Jan)
#### Post date: [November 22, 2022, 8:37pm UTC](https://forum.sensor.community/t/sds011-humidity-corrected/1677/7 "2022-11-22T20:37:27Z")
Its a correction factor, so first u calculate the factor depending on the rH and devide the measured pM by the factor
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### Author:  [@ruwn](https://forum.sensor.community/u/ruwn)
#### Post date: [December 4, 2022, 3:09am UTC](https://forum.sensor.community/t/sds011-humidity-corrected/1677/8 "2022-12-04T03:09:42Z")
Interesting. I would have thought that the higher the humidity gets the higher also the measured by the SDS011 pm value. But here it seems the other way around
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### Author:  [@sensorsalnorth12](https://forum.sensor.community/u/sensorsalnorth12)
#### Post date: [December 4, 2022, 10:39am UTC](https://forum.sensor.community/t/sds011-humidity-corrected/1677/9 "2022-12-04T10:39:17Z")
I have just been answering a reply to a previous post on this please see
> [@How does the community use the PM2.5 data that is recorded at humidities above 70%?](https://forum.sensor.community/t/how-does-the-community-use-the-pm2-5-data-that-is-recorded-at-humidities-above-70/870/8):
>
> Thank you for the links. Over the year I have become familiar with Bernd Laquai’s work and have found his papers very useful. The information from the other group of workers is very useful too. Part of my reason for asking the question originally was to understand if anything was being done by others in the Sensor Community to correct for humidity etc. and determine best practice etc. Now that I am more familiar with the research and I have investigated the output from some of the more expensi…
It might be useful.
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### Author:  [@ruwn](https://forum.sensor.community/u/ruwn)
#### Post date: [December 6, 2022, 6:11pm UTC](https://forum.sensor.community/t/sds011-humidity-corrected/1677/10 "2022-12-06T18:11:31Z")
In fact I just missed the fact that one has to divide by the factor 😉
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### Author:  [@pjg](https://forum.sensor.community/u/pjg)
#### Post date: [December 8, 2022, 7:25am UTC](https://forum.sensor.community/t/sds011-humidity-corrected/1677/11 "2022-12-08T07:25:49Z")
If someone helps me to solve the hexbin recalculating issue when the map is zoomed a lot, I add a menu for RH correction😀
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### Author:  [@pjg](https://forum.sensor.community/u/pjg)
#### Post date: [December 8, 2022, 7:28am UTC](https://forum.sensor.community/t/sds011-humidity-corrected/1677/12 "2022-12-08T07:28:21Z")
I have direct contact to TERA CTO. He told me that if the Next pm is used like in the SC firmware the correction is inactive. Only if permanent on.