Germany ASR A3.5 Room Temperature Rule — Heat Stress Control Measures

Germany ASR A3.5 room-temperature rule for indoor workplaces and work rooms.

Governing formula

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

Table assumes indoor work — ASR A3.5 does not apply to outdoor work.

Indoor temperature (°C)	Result
20	Below 26°C summer-heat trigger
21	Below 26°C summer-heat trigger
22	Below 26°C summer-heat trigger
23	Below 26°C summer-heat trigger
24	Below 26°C summer-heat trigger
25	Below 26°C summer-heat trigger
26	26–29.9°C: additional measures recommended
27	26–29.9°C: additional measures recommended
28	26–29.9°C: additional measures recommended
29	26–29.9°C: additional measures recommended
30	30–34.9°C: effective measures required
31	30–34.9°C: effective measures required
32	30–34.9°C: effective measures required
33	30–34.9°C: effective measures required
34	30–34.9°C: effective measures required
35	Stop work
36	Stop work
37	Stop work
38	Stop work

Required inputs: indoorTempC

Optional inputs: outdoor

🇩🇪 Germany BAuA ASR A3.5 room temperature rule — BAuA / Germany Federal Ministry of Labour and Social Affairs (official page)