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Germany ASTA Outdoor Heat Recommendation (Beurteilungstemperatur) — Heat Stress Control Measures

ASTA (Ausschuss für Sicherheit und Gesundheit bei der Arbeit an Arbeitsstätten) recommendation 'Hitzeschutz an Arbeitsstätten im Freien' for outdoor and not-fully-enclosed workplaces. Applies to outdoor and not-fully-enclosed workplaces only; computes a corrected Beurteilungstemperatur rather than reading raw indoor room temperature — see germany_asr_a35 for the indoor Raumtemperatur rule this recommendation does not replace or duplicate.

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Governing metric
Beurteilungstemperatur (assessment temperature, °C). At or below 26°C it equals air temperature. Above 26°C it is air temperature plus additive correction terms for work intensity (Tab. 1), clothing (Tab. 2), solar radiation (Tab. 3), Schwüle/humidity (Tab. 4), and wind (Tab. 5), then categorized into 4 Hitze-Stufen (Tab. 6).
Authority
Ausschuss für Sicherheit und Gesundheit bei der Arbeit an Arbeitsstätten (ASTA) / BAuA, Germany
Jurisdiction
Germany
Legal status
Guidance
Published
2025-08-21 (unverified)
Rule type
Control Overlay
Standard ID
HGC-113

Check a reading against this rule

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Governing formula

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

Control measures

Outdoor and not-fully-enclosed workplaces only (ASTA §1); indoor rooms are governed by ASR A3.5, not this recommendation. With no relative humidity supplied the Tab. 4 Schwüle correction is reported as not evaluated rather than assumed zero, and with no wind speed supplied the Tab. 5 wind credit is not applied.

Shade air temperature (°C)Result
20Hitze Stufe 1 (bis 26°C): Gefährdung durch Hitze gering
21Hitze Stufe 1 (bis 26°C): Gefährdung durch Hitze gering
22Hitze Stufe 1 (bis 26°C): Gefährdung durch Hitze gering
23Hitze Stufe 1 (bis 26°C): Gefährdung durch Hitze gering
24Hitze Stufe 1 (bis 26°C): Gefährdung durch Hitze gering
25Hitze Stufe 1 (bis 26°C): Gefährdung durch Hitze gering
26Hitze Stufe 1 (bis 26°C): Gefährdung durch Hitze gering
27Hitze Stufe 3 (über 30°C bis 35°C): Maßnahmen müssen ergriffen werden
28Hitze Stufe 3 (über 30°C bis 35°C): Maßnahmen müssen ergriffen werden
29Hitze Stufe 3 (über 30°C bis 35°C): Maßnahmen müssen ergriffen werden
30Stop work
31Stop work
32Stop work
33Stop work
34Stop work
35Stop work
36Stop work
37Stop work
38Stop work
39Stop work
40Stop work

Inputs

Required inputs: airTempC

Optional inputs: workload, restrictiveClothing, ppe, sunExposure, relativeHumidity, windSpeedMS, outdoor

Sources

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