The air quality measuring instruments consists of indoor air quality (IAQ) monitor and outdoor air monitor. The main objective to measure air quality is to understand the main air pollutants in our environment, whether is indoor, inside the building, or outdoor, in the open space.
The common IAQ monitor measure pollutants such as dust (PM2.5), carbon dioxide (CO2), formaldehyde (HCHO), and Chemicals (VOCs). There are more outdoor air pollution to monitor, and the top most common types of gases are Sulfur dioxide (SO2), Carbon monoxide (CO), Carbon dioxide (CO2), Nitrogen oxide (NO), Nitrogen dioxide (NO2), Volatile organic compounds (VOCs), Particulate Matter (PM), and Ozone (O3).
In Singapore, visit https://www.haze.gov.sg/ to view the air quality information.
The Singapore BCA, NEA & MOH have the Guidance on improving ventilation and indoor air quality in buildings amid the COVID-19 situation. The advisories link as follow: https://www.nea.gov.sg/our-services/public-cleanliness/environmental-cleaning-guidelines/advisories/guidance-on-improving-ventilation-and-indoor-air-quality-in-buildings-amid-the-covid-19-situation
In 2021, the BCA-HPB Green Mark Healthier Workplaces:2018 and Green Mark:2021 Certification Requirements with 18 points on Indoor Air Quality and 12 points on Spatial Quality. GMM have IAQ monitoring system to meet the criteria.