Which of the following gases is not measured for car park air quality management?

In the context of car park air quality management, the measurement of specific gases plays a crucial role in ensuring a safe environment for occupants and complying with health standards. Carbon dioxide (CO2) is a naturally occurring gas that is often not the primary focus for measurement in car parking environments. Instead, more harmful gases that can arise from vehicle emissions, such as nitrogen dioxide (NO2), formaldehyde (CHO), and ozone (O3), are typically monitored due to their direct impact on air quality and human health.

Measuring NO2 is vital because it is a pollutant associated with vehicle exhaust that can have serious health implications. CHO, which represents aldehydes like formaldehyde, is significant for its potential to cause respiratory issues and is also often found in car park environments. Ozone is a secondary pollutant that can form from reactions between vehicle emissions and sunlight, making its measurement important for understanding outdoor air quality that may infiltrate parking structures.

In this context, while CO2 levels can indicate occupancy and ventilation efficiency, it does not pose the same immediate health risks as the other gases being monitored. Therefore, CO2 is often not prioritized in car park air quality assessments despite its importance in overall building ventilation management.