Common Indoor Air Pollutants

Carbon Dioxide


Carbon Monoxide


Respirable suspended particulates


Nitrogen Dioxide










Biological Contaminants


Volatile Organic Compounds (VOCs)


Environmental Tobacco Smoke


Why IAQ is Important?

11% Of Death Cases Around The World Are Caused By Air Pollution

According to Statistic (Source 1) shows that 11% of death cases of the world are caused by air pollution. It is also one of the major factors that leads to the burden of world diseases.

Data reveals air pollution ranks the third of world diseases’ burden, following high blood pressure and smoking.

Source 1: Ritchie, H., & Roser, M. (2017, October). Air Pollution. Our World in Data; Global Change Data Lab.

An Increment of 1mg In PM2.5 Leads To The Increase Of COVID-19 Death Rate By 15%

World Health Organization and Centers for Disease and Control Prevention state that, various of viruses can be transmitted through respiratory droplets and airborne, especially for COVID-19.

With an increase in 1mg/m3 of PM2.5, the death rate of COVID-19 will increase by 15%, research (Source 2) found.

Source 2: Sannigrahi, S., Pilla, F., Maiti, A., Bar, S., Bhatt, S., kaparwan, A., Zhang, Q., Keesstra, S., & Cerda, A. (2022). Examining the status of forest fire emission in 2020 and its connection to COVID-19 incidents in West Coast regions of the United States

Air Pollution Affects Sleeping Quality

Air pollution not only threatens our health, but also our sleeping quality.

A research conducted by The American Thoracic Society (Source 3) shows that suspended particles PM2.5 and nitrogen dioxide directly relates to sleeping quality. Sleeping under substantial amount of PM2.5 and nitrogen dioxide, the sleeping quality will decrease by 50% and 60% respectively.

Source 3: Air Pollution May Disrupt Sleep. (n.d.). Retrieved April 26, 2022

Causes Different Unwellness And Diseases

Air pollution potentially brings negative impact on our health, from inside of our body to prominent symptoms such as itchiness of nose and throat, asthma, coughing, chest pain and chest tightness. When patients who suffer from asthma and chronic respiratory diseases are exposed to air pollutants, their illness will get worse.

Numerous local research states that, patients who were sent to hospitals because of respiratory and cardiovascular diseases, as well as numbers of early death are substantially related to severe air pollution.

Slow Down Productivity

Research (Source 4) found that an increase of 10mg PM2.5 results in decrease of 1% in productivity. Long exposure of indoor air pollution at workplace affects employees’ mood and emotion.

Source 4: Severe air pollution affects the productivity of workers: Prolonged exposure to pollutant particles was shown to reduce the output of workers in China. (2019). ScienceDaily.

Economic Loss

Apart from early death, according to World Bank’s estimation (Source 5), air pollution caused a loss of labour cost of the world at 225 billion US dollars in 2019, and over thousands of billion US dollars in medical cost.

Source 5: Pollution. (n.d.). World Bank.