sensortoolkit.qc._purpleair_abcleaning

This module contains a method for averaging the dual PMS5003 PM2.5 data channels for PurpleAir PA-II and PA-II-SD sensors. This method of data averaging was developed by Barkjohn et al. 2021 1, and is discussed in detail in the publication section 3.2.3 “Comparison of A and B channels”. Briefly, quality control (QC) criteria are applied during data averaging, whereby the absolute and percent difference between concurrent (nearest neighbor by logged timestamp) A and B channel measurement pairs are calculated. If both of these QC criteria do not exceed respective thesholds, the A and B channels are averaged. Otherwise, occasions where the A and B channel differ by a margin greater than the QC criteria thresholds are set null.

Footnotes

1

Barkjohn, K. K., Gantt, B., and Clements, A. L.: Development and application of a United States-wide correction for PM2.5 data collected with the PurpleAir sensor, Atmos. Meas. Tech., 14, 4617–4637, https://doi.org/10.5194/amt-14-4617-2021, 2021.


@Author:
Samuel Frederick, NSSC Contractor (ORAU)
U.S. EPA / ORD / CEMM / AMCD / SFSB
Created:

Wed Jul 7 13:32:49 2021

Last Updated:

Wed Aug 18 09:10:24 2021

Functions

purpleair_ab_averages

Average A and B channel data for PurpleAir sensors.