Why are Hong Kong schools experiencing significantly poorer air quality than outdoor stations?

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Indoor Air Quality in Hong Kong Schools Significantly Worse Than Outdoor Air

Recent data from the "Clean Air Schools for Hong Kong" (CASHK) project reveals that some participating schools experience air quality levels that are considerably poorer than those recorded at nearby government outdoor monitoring stations. Specifically, certain schools registered Air Quality Health Index (AQHI) levels of 7 or above for as much as 26.9% of the time, while the closest official stations reported moderate levels (6 or below). This discrepancy highlights a critical issue within the school environments themselves, indicating that indoor air pollution poses a greater health risk than the ambient outdoor air in these locations.
Elevated Carbon Dioxide Levels Indicate Poor Ventilation

A significant factor contributing to the compromised indoor air quality is the consistently high concentration of carbon dioxide (CO2) within classrooms. The CASHK project found that CO2 levels in most classrooms averaged around 1,100 parts per million (ppm) on a quarterly basis. More concerningly, some classrooms reached unhealthy CO2 levels for up to 50% of the time, with readings peaking as high as 3,000 ppm. Such elevated CO2 concentrations are indicative of inadequate ventilation, a known issue in many indoor spaces.
Health and Cognitive Impacts of Poor Indoor Air

The persistent presence of high CO2 levels in school classrooms has direct implications for students' health and academic performance. When CO2 concentrations are elevated, it allows airborne bacteria and viruses to remain suspended in the air for longer periods, thereby increasing the risk of infectious disease transmission among students. Furthermore, research suggests that these conditions can lead to a substantial decrease in cognitive functions, with potential reductions of up to 80%. This suggests a direct link between the quality of indoor air and students' ability to learn and stay healthy.
Need for Improved Ventilation and Regulation

The findings underscore a broader concern regarding the management of indoor environments in Hong Kong's schools. While the exact reasons for the disparity between indoor and outdoor air quality are not fully detailed, the high CO2 levels strongly suggest that ventilation systems may be insufficient or improperly maintained. Experts have indicated that improving and regulating indoor ventilation equipment, exhaust systems, and air filtration in public buildings, including schools, is crucial for preventing the spread of viruses and ensuring a healthier environment for occupants.

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Why are Hong Kong schools experiencing significantly poorer air quality than outdoor stations?

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