This is a free and simple application that displays the current value of the
index. It works on the tablets, phones and smartphones that are connected to the Internet. At first, it gets the
local coordinates (latitude and longitude) from your device's GPS and then
retrieves the AQ index from an Internet server (aqicn.org).
The value of this index represents the air pollution level at your location (given
by the closest station in your city). This index is computed every hour and
includes the measurements of all known pollutants (PM 2.5, PM10, NO2, CO, SO2,