A correction equation is applied to fields of the incoming
pat object to generate a "pm2.5_corrected" time series which is
added to the returned pat object.
The default, "EPA_FASM" correction is described on slide 37 of a
presentation on the correction of PurpleAir data for the
EPA Fire and Smoke Map.
This correction has two parts:
Low Concentration (\(pm2.5\_cf\_1 <= 343 \mu g/m^3\)):
\(pm2.5\_corrected = 0.52 * pm\_2.5\_cf\_1 - 0.086 * humidity + 5.75\)
High Concentration (\(pm2.5\_cf\_1 > 343 \mu g/m^3\)):
\(pm2.5\_corrected = 0.46 * pm2.5\_cf\_1 + 3.93 * 10^{-4} * pm2.5\_cf\_1^2 + 2.97\)
pat_applyCorrection(pat = NULL, name = c("EPA_FASM"))Previously generated houly pat object.
Name of correction to apply. One of "EPA_FASM"
A PurpleAir Timeseries pat object with an additional
"pm2.5_corrected" variable.