Dear PurpleAir + Community,
I was doing QAQC of PurpleAir ¶ monitors (pm2.5_atm_*) over India and found lots of data as invalid. I would like your thoughts/opinion about it. Below is QAQC routine for PM2.5_ATM between channel A and B.
Attached is analysis of Sensor_Index=4105. QAQC was conducted using 10-,minutes data for entire period till 6/10/2022. Below criteria were used for QAQC of PurpleAir PM2.5:
10-minute PurpleAir PM2.5_ATM for all monitors
- for PurpleAir ATM_A PM2.5 ≤ 0.3 µg/m3 and >=1000 µg/m3: Invalid
- for PurpleAir ATM_A PM2.5 between > 0.3 and ≤ 100 µg/m3 : if difference between Channel A and B within ± 10 µg/m3 : Valid
- for PurpleAir ATM_A PM2.5 > 100 µg/m3 and < 1000 µg/m3: if difference between Channel A and B within ± 10 % : Valid