Table 1 Summary of several kinds of environmental control systems

ACMV systems

Better IAQ control performance over chemical and particulate pollutants

[88]

The presence of a table between two users resulted in an approximate 50% increase in the user's exposure risk (DV system) and a 22% increase (MV system)

[89]

Complex MV system could reduces the chance of hospital-acquired infection (HAI) airborne transfer

[90]

NV and MV systems could provide fresh air and remove polluted air from the indoor environment

[91, 92]

Intelligent environmental monitoring system

Send messages to distant users and operate ventilation and air purifiers with effectiveness using mobile devices

[93]

Independent temperature and humidity control, individualised fresh air ventilation, and increased indoor comfort

[94]

The monitoring system

Utilizing WSN with web interface to effectively monitor air quality of environmental parameters, providing patients with a more comfortable environment

[95]

Monitor the concentration of indoor and outdoor air pollutants to limit the sources of indoor PM and other pollutants

[96]