Humidity (% RH)
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Humidity refers to the amount of water vapor present in the air. In occupational hygiene, both high and low relative humidity levels create workplace hazards. High humidity impairs the body's ability to cool itself through perspiration, increasing the risk of heat stress and heat stroke, particularly in hot work environments. It also promotes microbial growth, corrosion of equipment, and degradation of materials. Low humidity can cause dryness and irritation of mucous membranes and skin, increase static electricity, and worsen respiratory conditions. Humidity measurement is an essential component of heat stress assessments, HVAC system evaluation, and cleanroom monitoring.
Humidity can affect comfort, indoor air quality, and process conditions in workplaces, labs, and controlled environments. Rent relative humidity monitoring instruments from RAECO Rents for indoor environmental quality checks, HVAC verification, cleanroom monitoring, and moisture-related investigations. Instruments are maintained and supported with annual calibration so teams can trust the readings during assessments.
Regulatory Exposure Limits
As of March 09, 2026
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ACGIH TLV
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