I. Temperature

Risk Level:
    – Low: 22-25°C (72-77°F)
    – Moderate: 20-21°C (68-71°F) or 26-27°C (79-81°F)
    – High: <20°C (68°F) or >27°C (81°F)

Health Effects:
    – Low: Comfortable, no health risks
    – Moderate: Mild discomfort, potential for heat stress or hypothermia
    – High: Severe heat stress or hypothermia, increased risk of illness

II. Relative Humidity (RH)

Risk Level:
    – Low: 30-60%
    – Moderate: 20-29% or 61-70%
    – High: <20% or >70%

Health Effects:
    – Low: Comfortable, no health risks
    – Moderate: Mild discomfort, potential for respiratory issues
    – High: Severe respiratory issues, increased risk of illness

III. Carbon Dioxide (CO2)

Risk Level:
    – Low: <800 ppm
    – Moderate: 800-1200 ppm
    – High: >1200 ppm

Health Effects:
    – Low: No health risks
    – Moderate: Mild cognitive impairment, potential for respiratory issues
    – High: Severe cognitive impairment, increased risk of illness

IV. Particulate Matter (PM2.5)

Risk Level:
    – Low: <12 μg/m³
    – Moderate: 12-35 μg/m³
    – High: >35 μg/m³

Health Effects:
    – Low: No health risks
    – Moderate: Potential for respiratory issues, cardiovascular disease
    – High: Increased risk of respiratory issues, cardiovascular disease, cancer

V. Formaldehyde (HCHO)

Risk Level:
    – Low: <20 ug/m3
    – Moderate: 20-40 ug/m3
    – High: >40 ug/m3

Health Effects:
    – Low: No health risks
    – Moderate: Eye, nose, and throat irritation, potential for cancer
    – High: Severe eye, nose, and throat irritation, increased risk of cancer

VI. Total Volatile Organic Compounds (TVOC)

Risk Level:
    – Low: <200ug/m³
    – Moderate: 200-400 ug/m³
    – High: >400 ug/m³

Health Effects:
    – Low: No health risks
    – Moderate: Eye, nose, and throat irritation, potential for neurological issues
    – High: Severe eye, nose, and throat irritation, increased risk of neurological issues

Risk Assessment Matrix

ASHRAE 170 Requirements

– Temperature: 22-25°C (72-77°F)
– RH: 30-60%
– CO2: <800 ppm
– PM2.5: <12 μg/m³
– Formaldehyde: <20 ug/m3
– TVOC: <200 ug/m³

Note:

• This guideline is based on ASHRAE 170 and is specific to hospitals.

• The risk levels and health effects listed are general guidelines and may vary depending on individual circumstances.

• It’s essential to consult with a qualified professional to determine the appropriate risk assessment and mitigation strategies for your specific environment.