Indoor CO monitoring in a surgical intensive care unit under visitation restrictions during the COVID-19 pandemic.

Background: Indoor CO concentration is an important metric of indoor air quality (IAQ). The dynamic temporal pattern of CO levels in intensive care units (ICUs), where healthcare providers experience high cognitive load and occupant numbers are frequently changing, has not been comprehensively characterized.

Objective: We attempted to describe the dynamic change in CO levels in the ICU using an Internet of Things-based (IoT-based) monitoring system.