Air-quality monitoring sensors

Air-quality monitoring sensors provide real-time or continuous information on particulate pollution and other relevant parameters. PHCFs may use indoor monitors for operational decisions or host outdoor sensor nodes within a wider monitoring network. Depending on objectives and verified performance, systems may measure PM2.5, PM10, selected gases, temperature and humidity and transmit data to a central platform. CO2 is mainly an indicator of ventilation and occupancy.

Supports warnings, preparedness and actions such as filtration, safer ventilation operation, reduced outdoor-air entry or relocation of vulnerable patients.

Supports targeted ventilation and filtration and can identify pollution sources or ineffective building-management measures. Energy savings are secondary; monitoring should never justify ventilation below health-care requirements.

High value where wildfire smoke, dust or severe urban pollution recur, especially where conventional monitoring is limited. Lower-cost sensors can extend coverage through existing PHCFs, but devices vary in performance and should not be treated as regulatory-grade monitors without validation. Costs also include mounting, power, connectivity, data management, maintenance and staff time.

Sensors require appropriate placement, power, periodic cleaning or calibration, data-quality checks and staff able to interpret readings. Connected outdoor nodes may also require communications, secure data transmission and maintenance access.

Highly relevant because pregnant women, newborns and children are especially vulnerable to air pollution. Monitoring can identify hazardous periods and trigger filtration, safer ventilation, reduced outdoor-air entry or relocation to protected spaces.

WHO identifies air-quality monitoring as fundamental for understanding health impacts and supporting action. WHO Viet Nam has piloted low-cost sensors in climate-resilient and environmentally sustainable health-care facilities to build evidence for wider application. EPA guidance supports lower-cost monitoring while emphasizing monitoring objectives, sensor performance, data quality and appropriate interpretation.