Home > Introduction to Indoor air quality in singapore

Indoor Air Quality (IAQ) deals with the health and comfort of the air inside buildings. The IAQ may be compromised by microbial contaminants (mold, bacteria), chemicals, allergens, or other contaminants that can affect the health of people. Often the perception is that outdoor air is polluted, but indoor air is acceptable. Many studies and experience show that this isn't always the case.

There is good news and bad news about indoor air: the bad news is that indoor air often contains higher concentrations of hazardous pollutants than outdoor air; however, the good news is that everyone can reduce indoor air pollution.

Acceptable indoor air quality is the quality of air within a residence or work area, where the concentrations of unwanted gases or particulates are so low they will not adversely affect the health or comfort of the occupants. Poor indoor air quality occurs when gases or particles are present in quantities that would lead to Sick Building Syndrome complaints, lost worker productivity, and tenant health complaints such as allergic reactions, nausea, chronic fatigue, and respiratory problems.

According to the World Health Organization, approximately 30% of all commercial buildings have significant indoor air quality problems. Sadly, with modern day construction practices, residential properties are built to prevent the intrusion of all fresh air from the outside environment allowing contaminants to accumulate in the air to levels that cause discomfort, respiratory distress or illness.

A healthy indoor environment is one in which the surroundings contribute to productivity, comfort and a sense of health and well being. The qualities of good indoor air include:

• Introduction and distribution of adequate ventilation air.
• Control of airborne contaminants.
• Maintenance of acceptable temperature and relative humidity.

IAQ problems can develop due to improper maintenance, modifications to controls, and improper design of AHU systems. Improper maintenance can cause missing, dirty, and/or collapsed filters. Habitats for microbial growth are often created by standing water in condensate pans and clogged condensate lines, by moisture blow from fan coils into ducts, and by standing water at outside air intakes.