Wrong units - Githubissues

pawkakol1 / worlds-air-quality-index

HACS World's Air Quality Index integration from waqi.info

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Wrong units #19

Closed pipacsba closed 12 months ago

pipacsba commented 2 years ago

Most of the sensors are showing ug/m3 as unit_of_measurement. I think waqi provides the values in some strange 1-500 AQI Levels. https://www.airnow.gov/sites/default/files/2020-05/aqi-technical-assistance-document-sept2018.pdf

Best would be to transfer back (at least optionally) to ug/m3, but I think the proper unit should be shown.

wBrhy2 commented 1 year ago

We have the same issue in Ontario Canada, where the PM2.5 is converted to AQI. We would need to be able to override the unit or measurement or revert it to ug/m3

pawkakol1 commented 12 months ago

Unfortunately AQI value range between 1-500 is generated by WAQI, and then exposed in their REST API. AQI scale is based on US EPA standard, and it uses Instant Cast reporting formula, which is described on main page of WAQI web site. The US EPA standard predicts formula based on 24-hour average data to calculate AQI, so I'm not able to recalculate AQI value get from their RES API to current value in ug/m3. I need to close this issue.