Volatile organic compounds or VOCs are molecules containing carbon which are predominantly in the gaseous state at room temperature.This article will present the possible sources of indoor VOCs, how VOCs impact on people with asthma and allergy and discuss the ability of air cleaners to reduce VOCs in the indoor environment.

Air conditioners can play a significant role in good indoor air quality. Greater asthma morbidity – specifically a larger number of hospitalizations, wheezing episodes and night symptoms due to asthma – have been associated with the presence of moisture, mildew and cockroach allergen in homes. Air conditioners provide a dual function of controlling temperature and relative humidity in home environments, as well as potential removal of allergens.

It is a common statistic when talking about the quality of indoor air, that we spend approximately 90% of our time indoors. The origin of that statistic was a study by the US Environmental Protection Agency back in 19891. The importance of this is the nature of the contained environment of the home; in the move towards greater environmental sustainability, homes have become more energy efficient and more tightly sealed. While this provides a better environmental impact, it also means that the air in the home does not become renewed through passage of fresh air.