I was idly toying with the idea of changing the AQI breakpoints in purpleair-inc.php in accordance with
the new guidelines when I was brought up short: what does
global $useLRAPA;
in line 511 refer to?
LATER EDIT: it appears to refer to a PurpleAir correction factor, for use
only in areas where PM 2.5 particles are dominated by wood smoke. Not a lot of that around here. . .