Exposure limits & monitoring
Lab Edu3
Action level
Triggers monitoring and medical follow-up.
Step 3 / 6VOICE · ON
IN ONE LINE
PELs, TLVs and action levels define safe exposure — and monitoring proves you're under them.
WHAT YOU'LL LEARN
Distinguish PEL, TLV and action level.
Explain why and when air monitoring happens.
Recognise the early signs of overexposure.
READ THE LESSON
Three numbers, three sources
The PEL is OSHA's enforceable ceiling; the TLV is ACGIH's science-based guideline, often stricter; the action level is the point where monitoring and medical surveillance kick in.
Monitoring makes it real
For regulated substances, air sampling measures what you actually breathe over a shift. If results approach a limit, the lab must add controls and offer medical follow-up.
Your body is a sensor
Headaches, dizziness, a metallic taste or eye irritation can signal overexposure before instruments do. Stop, ventilate and report — don't push through it.
Your right
If you suspect overexposure, the standard gives you access to a medical consultation at no cost to you.
QUICK CHECK
1 / 5What is a PEL?
Select an answer to continue
OSHA · 06
KEY POINTS
PEL is legal; TLV is the guideline.
Action level triggers monitoring.
Symptoms can warn before instruments.
You can request a medical consultation.
REFERENCES
OSHA 1910.1000 — Air contaminants
ACGIH TLVs and BEIs (current)
NIOSH Pocket Guide to Chemical Hazards
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