weewx-aqi-xtype - an XType extension to calculate AQI for multiple sensors

[bell...@gmail.com]

 Why another AQI extension? From my research, both https://github.com/jonathankoren/weewx-aqi and https://github.com/chaunceygardiner/weewx-airlink only support a single sensor. Plus I needed an excuse to learn about WeeWX XTypes. :)

 It can be found here, https://github.com/bellrichm/weewx-aqi-xtype

Note, it currently it only supports the US EPA algorithm for pm 2.5 and pm 10.0 (https://www.airnow.gov/publications/air-quality-index/technical-assistance-document-for-reporting-the-daily-aqi/)

Enjoy.
- rich