Pm25

Issues
1

Hi,

I noticed that $aq(pm25)$ is not the daily average PM2.5 value as it should, but is equal to $aq(index)$

Is this a bug?

Thank you!

2

Ok, I think I got it.

I guess KWGT is using free API from the World Air Quality Index project.

Here's how they calculate AQI
https://aqicn.org/faq/2015-03-20/a-comparison-of-worldwide-air-quality-scales-part-1/
and that's the reason why US EPA AQI converted PM2.5 value is equal to the AQI.

3

I also found that airvisual.com free APIs are much more reliable and their data are more often updated.

4

iqair.com free API doesn't support PM2.5 PM10 what is the alternative ? please recommend.

5

Hi. You can use

https://aqicn.org/api/aqicn.org

they've got both free widget API and JSON API service

https://aqicn.org/json-api/doc/

With JSON API you can code your own KWGT widget. I coded my own using Automate (Llamalab) to download updated JSON based on GPS position and KWGT to show results on smartphone home page.