PSI Singapore: Understanding Air Quality in Singapore
Welcome to this article about PSI Singapore! If you live in Singapore, you may have heard about the Pollutant Standards Index (PSI) and its impact on air quality. Understanding PSI and air quality in Singapore is important for your health and well-being, especially during periods of haze caused by forest fires in the region.

The National Environment Agency (NEA) is responsible for monitoring and reporting on air quality in Singapore. The PSI is a measure of air quality based on the concentration of pollutants in the air. The higher the PSI value, the more polluted the air is and the greater the health risk. The NEA provides regular updates on PSI levels and health advisories to help you manage your outdoor activities and protect yourself from the harmful effects of air pollution.
Key Takeaways:
- Understanding PSI and air quality in Singapore is important for your health and well-being.
- The NEA is responsible for monitoring and reporting on air quality in Singapore.
- The PSI is a measure of air quality based on the concentration of pollutants in the air.
Understanding PSI and Air Quality in Singapore

Air quality is an important aspect of life in Singapore, and the National Environment Agency (NEA) monitors it closely. The Pollutant Standards Index (PSI) is a measure of air quality used in Singapore, and it is based on the concentration levels of six pollutants: PM2.5, PM10, ozone, sulphur dioxide, nitrogen dioxide, and carbon monoxide.
What Is the Pollutant Standards Index (PSI)?
The PSI is a scale that ranges from 0 to 500, and it is divided into five categories: Good, Moderate, Unhealthy, Very Unhealthy, and Hazardous. A PSI reading of 0 to 50 is considered Good, while a reading of 51 to 100 is Moderate. A reading of 101 to 200 is Unhealthy, 201 to 300 is Very Unhealthy, and anything above 300 is considered Hazardous.
The PSI is calculated based on a 24-hour average of the concentration levels of the six pollutants mentioned earlier. The NEA also provides a one-hour PM2.5 reading, which is a measure of the concentration of fine particulate matter in the air.
Health Implications of PSI Levels
The health effects of air pollution can be significant, especially for vulnerable groups such as children and the elderly. Exposure to high levels of pollution can cause respiratory problems, aggravate existing heart and lung conditions, and increase the risk of stroke.
When the PSI levels are in the Unhealthy range or higher, the NEA issues a Health Advisory, which recommends that people with existing heart or lung conditions, as well as children and the elderly, avoid prolonged or strenuous outdoor activities.
NEA’s Role in Monitoring and Reporting
The NEA is responsible for monitoring and reporting air quality in Singapore. The agency has a network of air quality monitoring stations located throughout the country, and it provides regular updates on the PSI levels through its website and other channels.
During periods of elevated pollution, such as during the haze season, the NEA activates its Haze Task Force to coordinate efforts to manage the situation and provide timely information to the public.
In conclusion, understanding the PSI and air quality in Singapore is important for maintaining good health and well-being. By staying informed about the latest PSI readings and following the NEA’s Health Advisory, you can take steps to protect yourself and your loved ones from the harmful effects of air pollution.
Managing Haze and Outdoor Activities

Precautions During Different PSI Bands
When the Pollutant Standards Index (PSI) reading falls within the moderate range of 51 to 100, you can carry out your outdoor activities as usual. However, it is recommended that you reduce prolonged or strenuous outdoor activities if you experience any discomfort.
When the PSI reading falls within the unhealthy range of 101 to 200, it is advisable to reduce outdoor activities, especially for children, the elderly, and those with heart or lung diseases. If you must be outdoors, wear an N95 mask to protect yourself from inhaling haze particles.
When the PSI reading falls within the very unhealthy range of 201 to 300, you should avoid all outdoor activities, including jogging and other normal activities. Schools may also suspend outdoor activities during this period.
When the PSI reading exceeds 300, it is hazardous to your health, and you should stay indoors as much as possible. If you need to be outdoors, wear an N95 mask and limit your exposure to the hazy conditions.
Impact of Transboundary Haze
Transboundary haze is caused by forest fires in neighbouring countries such as Indonesia and Malaysia. The haze can affect the air quality in Singapore and cause the PSI reading to rise to unhealthy levels.
The government uses the 24-hour PSI forecast to implement action plans to minimize and manage the impact of haze on Singapore. Schools may also suspend outdoor activities, and the public is advised to reduce prolonged or strenuous outdoor activities when the PSI reading is high.
You can also do your part to reduce the impact of transboundary haze by conserving energy, reducing waste, and avoiding the burning of materials. Stay informed about the weather conditions and the PSI readings by checking the NEA website or using the PSI.SG app.
Remember to take the necessary precautions during different PSI bands and avoid outdoor activities when the PSI reading exceeds 300. Stay safe and healthy during the hazy season.
Frequently Asked Questions

How can I find out about today’s air quality in Singapore?
You can check the air quality in Singapore by referring to the Pollutant Standards Index (PSI). The PSI is a measure of air quality based on the concentration of pollutants in the air. You can find out about today’s air quality by checking the PSI readings provided by the National Environment Agency (NEA).
Where can I get live updates on the PSI levels in Singapore?
You can get live updates on the PSI levels in Singapore by visiting the NEA’s website or by downloading the NEA’s myENV app. The app provides real-time updates on the PSI levels, as well as other environmental information such as weather forecasts and lightning alerts.
What does a burning smell indicate about Singapore’s air quality?
A burning smell in Singapore may indicate that there are forest fires or land clearing activities taking place in the region. These activities can lead to an increase in air pollution and affect the PSI readings. It is important to monitor the PSI levels and take necessary precautions such as wearing a mask and avoiding outdoor activities if the PSI levels are high.
At what PSI level does the air quality become unhealthy in Singapore?
The air quality in Singapore is considered unhealthy when the PSI level reaches 101 or higher. At this level, the National Environment Agency (NEA) recommends reducing outdoor activities and wearing a mask if you need to be outdoors. When the PSI level reaches 201 or higher, the air quality is considered very unhealthy, and the NEA advises staying indoors as much as possible.
What’s the record for the highest PSI ever recorded in Singapore?
The highest PSI ever recorded in Singapore was 401 in 2013 during the haze crisis caused by forest fires in Indonesia. This was the worst haze Singapore had experienced in over a decade, and it led to a public health emergency.
Can you explain the meaning behind the PSI readings?
The PSI readings are based on the concentration of six pollutants in the air: particulate matter (PM10 and PM2.5), sulfur dioxide (SO2), nitrogen dioxide (NO2), carbon monoxide (CO), and ozone (O3). The PSI scale ranges from 0 to 500, with higher readings indicating poorer air quality. A PSI reading of 50 or below is considered good, while a reading of 100 or above is considered unhealthy.

