Sensor device class for Formaldehyde (HCHO)

psko · February 4, 2024, 11:33pm

Formaldehyde (HCHO) is being measured by some devices (like Plantower PMS5003ST) and it would be nice to have this device type add to: https://github.com/home-assistant/core/blob/3abc48b7c1444611f7b9c173b4d4959f29fae7a9/homeassistant/components/sensor/const.py
I see that there are NOx etc already, so for HCHO there should be a place

For an icon I’ve already requested it here:

github.com/Templarian/MaterialDesign

HCHO (formaldehyd) icon

opened 11:17PM - 04 Feb 24 UTC

pskowronek

Icon Request

### Before submitting a new icon request, please confirm the following: - [X] I… have [searched all issues](https://github.com/Templarian/MaterialDesign/issues?q=is%3Aissue) to make sure there isn't a request for this icon. - [X] I have [searched the current library](https://pictogrammers.com/library/mdi) to make sure the icon doesn't already exist. - [X] I understand that [brand icons are no longer being added](https://pictogrammers.com/docs/library/mdi/guides/brand-icons/) and I can use [SimpleIcons](https://simpleicons.org/) for my brand icon needs. - [X] I only intend to request a single icon (or a few near-identical ones) in this issue. ### What would you use this icon for? For Air Quality sensors for HCHO (formaldehyd) readings. It could be used together with other Air Quality readings like PM 1.0 PM 2.5, PM 10 (#7273), NOx and VOCs (#7216) especially that some sensors provide PM reading and HCHO (Plantower PMS5003ST). A lot of people are tracking now such information on their Home Assistant and other similar. ### Give us an example of what this icon might look like. The icon should be consistent with design of NOx, VOCs, however for HCHO it could resemble its molecular structure, see: [wiki icon](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Structural_formula_of_formaldehyde.svg/120px-Structural_formula_of_formaldehyde.svg.png)

Unit of measurement is “μg/m³”, the same as for PM 1, 2.5 & 10.