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China GBZ 2.2-2007 Heat Stress Limits — Heat Stress Work/Rest Limits

China occupational exposure limits for heat stress (GBZ 2.2-2007) defining WBGT thresholds by workload and work/rest fraction.

Open China GBZ 2.2-2007 Heat Stress Limits in the interactive Guidance Wiki →

Authority

National Health Commission (China)

Jurisdiction

China

Legal status

Regulation

Rule type

Schedule Engine

Standard ID

HGC-039

Governing formula

No standalone formula is published for this standard; see programmable logic and parameters below.

Work/rest limits

Acclimatized workers

WBGT (°C)	Light 180 W	Moderate 300 W	Heavy 415 W	Very heavy 520 W
24	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr
25	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr
26	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	45 / 15 min work/rest per hr
27	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	45 / 15 min work/rest per hr	30 / 30 min work/rest per hr
28	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	45 / 15 min work/rest per hr	30 / 30 min work/rest per hr
29	60 / 0 min work/rest per hr	45 / 15 min work/rest per hr	30 / 30 min work/rest per hr	15 / 45 min work/rest per hr
30	60 / 0 min work/rest per hr	30 / 30 min work/rest per hr	15 / 45 min work/rest per hr	15 / 45 min work/rest per hr
31	45 / 15 min work/rest per hr	15 / 45 min work/rest per hr	15 / 45 min work/rest per hr	Stop work
32	30 / 30 min work/rest per hr	15 / 45 min work/rest per hr	Stop work	Stop work
33	15 / 45 min work/rest per hr	Stop work	Stop work	Stop work
34	Stop work	Stop work	Stop work	Stop work
35	Stop work	Stop work	Stop work	Stop work
36	Stop work	Stop work	Stop work	Stop work

Unacclimatized workers

WBGT (°C)	Light 180 W	Moderate 300 W	Heavy 415 W	Very heavy 520 W
24	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	45 / 15 min work/rest per hr
25	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	45 / 15 min work/rest per hr	30 / 30 min work/rest per hr
26	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	45 / 15 min work/rest per hr	30 / 30 min work/rest per hr
27	60 / 0 min work/rest per hr	45 / 15 min work/rest per hr	30 / 30 min work/rest per hr	15 / 45 min work/rest per hr
28	60 / 0 min work/rest per hr	30 / 30 min work/rest per hr	15 / 45 min work/rest per hr	15 / 45 min work/rest per hr
29	45 / 15 min work/rest per hr	15 / 45 min work/rest per hr	15 / 45 min work/rest per hr	Stop work
30	30 / 30 min work/rest per hr	15 / 45 min work/rest per hr	Stop work	Stop work
31	15 / 45 min work/rest per hr	Stop work	Stop work	Stop work
32	Stop work	Stop work	Stop work	Stop work
33	Stop work	Stop work	Stop work	Stop work
34	Stop work	Stop work	Stop work	Stop work
35	Stop work	Stop work	Stop work	Stop work
36	Stop work	Stop work	Stop work	Stop work

Inputs

Required inputs: wbgtC, workload

Optional inputs: acclimatization

Sources

• 🇨🇳 China GBZ 2.2-2007 Table 8 (WBGT limits by work intensity and exposure fraction) — National Health Commission (China) (official regulation)

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