[Feature request] Add current air quality of location

Submitted by liv..@..@uc.cl

Assigned to Harald Judt

Link to original bug (#16482)

Description

AirVisual (https://www.airvisual.com/) provides detailed, real-time information on air quality of cities. They collect this from physical instruments they sell and customers set up in specific locations. The information is freely available on their website and is also provided through an API (https://www.airvisual.com/air-pollution-data-api). Would it be possible to add this information to the weather plugin? I asked whether this was possible in the forum (https://forum.xfce.org/viewtopic.php?id=13804) and the answer seems to be positive. I plan to offer a bounty for this feature, as my contribution to my many years freely enjoying Xubuntu.

Version: 0.8.10