What threshold level indicates the need to start recording temperature every four hours with wind speed considered?

The correct threshold level for starting to record temperature every four hours with wind speed considered is based on established health and safety guidelines that pertain to heat stress and heat-related illnesses. The threshold of 36 C (96.8 F) is significant because it serves as an indicator that conditions are becoming warm enough to require increased monitoring of environmental conditions.

In practical terms, when temperatures reach this level, workers may begin to experience increased physiological strain, particularly if they are engaged in strenuous activities or if there are additional risk factors such as humidity or wind speed. Monitoring at this threshold helps ensure that any potential heat stress issues can be addressed promptly, thereby protecting worker health and safety.

The other options reflect different thresholds that do not initiate this level of monitoring as effectively as the established standard. For instance, temperatures below 36 C would typically not prompt such careful monitoring, while a threshold set above 40 C may be too late for early intervention strategies to mitigate heat-related illnesses. The choice of 36 C balances the need for caution with practical monitoring guidelines in occupational health settings. By focusing on this specific threshold, it helps in reducing the risk of heat-related incidents among workers.