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Calcimator

Air Monitoring Action Levels Calculator

Interpret PID/FID readings against site-specific action levels and determine PPE protection level.

Inputs

Results

Corrected Reading (ppm)

8

Net Above Background (ppm)

7.5

PPE Level (1=D to 5=A)3
Action Level 1 Exceeded1
Action Level 2 Exceeded0
% of Action Level 1150
% of Action Level 21.5
Monitoring Interval (min)5
How to Use This Calculator
  1. Take an upwind PID/FID reading to establish the Background Reading (ppm) before entering the work zone.
  2. Enter the instrument's PID/FID Reading (ppm) from the work area and the chemical-specific Correction Factor (isobutylene = 1.0).
  3. Set Action Level 1 (ppm) for PPE upgrade and Action Level 2 (ppm) for SCBA/evacuation per your site safety plan.
  4. Review the Corrected Reading and Net Above Background results to see the true vapor concentration above ambient.
  5. Use the PPE Level (1=D to 5=A) output to select the required respiratory and chemical protective equipment.
  6. Follow the Monitoring Interval (min) recommendation and repeat readings to track concentration trends over time.
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