Calibration Process Steps

Step-I:

• We follow a reference method to calibrate the low-cost air quality monitors.
• A BAM 1020 is used as a reference monitor for calibration.

Step-II:

Low-cost monitors are co-located with the BAM 1020 monitor for a minim of 05 to 06 days. The measurements collected are used to develop a calibration factor which is applied to the low-cost sensor data.

Step-III:

• A linear regression model is applied to the measurements to derive the calibration factor.
• The results (R2) are examined to determine if they meet the minimum performance criteria. The minimum performance criteria being followed is: R2 > 0.70 and data recovery: > 75%.

Step-IV:

Low-cost monitors which do not meet the minimum performance criteria are sent to Skymet’s Instrumentation Division to check for any defects in the senor.