Articles | Volume 16, issue 19
Research article
05 Oct 2023
Research article |  | 05 Oct 2023

Seasonally optimized calibrations improve low-cost sensor performance: long-term field evaluation of PurpleAir sensors in urban and rural India

Mark Joseph Campmier, Jonathan Gingrich, Saumya Singh, Nisar Baig, Shahzad Gani, Adithi Upadhya, Pratyush Agrawal, Meenakshi Kushwaha, Harsh Raj Mishra, Ajay Pillarisetti, Sreekanth Vakacherla, Ravi Kant Pathak, and Joshua S. Apte


Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2023-35', R Subramanian, 12 Apr 2023
    • AC1: 'Reply on RC1', Joshua S. Apte, 02 Jun 2023
  • RC2: 'Comment on amt-2023-35', Anonymous Referee #2, 15 Apr 2023
    • AC2: 'Reply on RC2', Joshua S. Apte, 02 Jun 2023
  • RC3: 'Comment on amt-2023-35', Anonymous Referee #3, 25 Apr 2023
    • AC3: 'Reply on RC3', Joshua S. Apte, 02 Jun 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Joshua S. Apte on behalf of the Authors (02 Jun 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (19 Jun 2023) by Albert Presto
RR by R Subramanian (27 Jun 2023)
RR by D.A.J. Jaffe (09 Jul 2023)
ED: Publish as is (20 Jul 2023) by Albert Presto
AR by Joshua S. Apte on behalf of the Authors (04 Aug 2023)  Author's response   Manuscript 
Short summary
We studied a low-cost air pollution sensor called PurpleAir PA-II in three different locations in India (Delhi, Hamirpur, and Bangalore) to characterize its performance. We compared its signal to more expensive reference sensors and found that the PurpleAir sensor was precise but inaccurate without calibration. We created a custom calibration equation for each location, which improved the accuracy of the PurpleAir sensor, and found that calibrations should be adjusted for different seasons.