Kiera Jefferson
The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore, which is a number used to indicate the level of pollutants in the air. The PSI is based on six pollutants: sulphur dioxide (SO2), particulate matter (PM10), fine particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO), and ozone (O3). The pollutant with the most significant concentration determines the PSI value. Other countries use different air quality indices, such as the Air Quality Health Index (AQHI) in Canada, the Comprehensive Air-quality Index (CAI) in South Korea, and the Air Quality Index (AQI) in the US. These indices help communicate air quality status to the public and are calculated from pollutant concentrations, with each country defining its index based on national air quality standards.
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What You'll Learn
- The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore
- PSI is based on six air pollutants: sulphur dioxide (SO2), particulate matter (PM10), fine particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO) and ozone (O3)
- PSI is reported as a number on a scale of 0 to 500
- PSI is determined by the pollutant with the most significant concentration
- PSI ranges are grouped by index values and descriptors, explaining the effects of the levels
The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore
Initially, the PSI in Singapore was based on five air pollutants: sulphur dioxide (SO2), particulate matter (PM10), nitrogen dioxide (NO2), carbon monoxide (CO), and ozone (O3). However, since April 1, 2014, it has also included fine particulate matter (PM2.5). Singapore publishes the PSI derived from averaging data collected over 24 hours, as well as 1-hour PM2.5 concentrations every hour.
The PSI is calculated by determining a sub-index value for each pollutant based on its ambient air concentration. The highest sub-index value becomes the PSI value, representing the pollutant with the most significant concentration. During haze episodes, PM2.5 is typically the most significant pollutant.
Singapore's PSI is based on a scale devised by the United States Environmental Protection Agency (EPA) to facilitate daily air quality reporting in broadcasts and newspapers. While PSI is used in Singapore, other countries may use different names for their air quality indices, such as the Air Quality Health Index or Air Pollution Index, and their calculations may differ.
Singapore has experienced smoke haze from nearby forest fires in Sumatra, Indonesia, which has impacted its air quality. In June 2013, a severe haze pushed Singapore's PSI into hazardous levels for the first time. The highest 3-hour PSI reading recorded was 471 on October 20, 2015, at 11 pm (GMT+8). Singapore's PSI computations have been correlated with health outcomes, including an increased risk of out-of-hospital cardiac arrest during episodes of high PSI.
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PSI is based on six air pollutants: sulphur dioxide (SO2), particulate matter (PM10), fine particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO) and ozone (O3)
The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore. It is based on six air pollutants: sulphur dioxide (SO2), particulate matter (PM10), fine particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO), and ozone (O3). The PSI value is determined by calculating a sub-index value for each pollutant based on its ambient air concentration and then selecting the highest sub-index value. This means that the PSI reflects the pollutant with the most significant concentration.
Particulate matter (PM) is a mixture of many chemical species, including solids, liquid droplets, and aerosols. PM10 includes dust from construction, landfills, agriculture, wildfires, and industrial sources, while PM2.5 is primarily produced by the combustion of gasoline, oil, diesel fuel, or wood. PM2.5 is associated with the greatest adverse health effects related to air pollution, including premature death, particularly in those with chronic heart or lung diseases.
Carbon monoxide (CO) is a colorless, odorless gas released when something is burned, primarily from vehicles and machinery that burn fossil fuels. When inhaled in large amounts, CO reduces the amount of oxygen transported in the bloodstream, which can lead to dizziness, confusion, unconsciousness, and even death.
Ozone (O3) is a gas composed of three oxygen atoms. Ground-level ozone is a harmful air pollutant as it can trigger health problems, especially in children, the elderly, and people with lung diseases. It is formed through chemical reactions between oxides of nitrogen and volatile organic compounds, which are emitted by cars, power plants, industrial boilers, and other sources.
Overall, the PSI provides a way to quantify and communicate the level of pollutants in the air, with the specific pollutants included in the calculation being chosen for their significant impact on air quality and human health.
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PSI is reported as a number on a scale of 0 to 500
The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore. It is reported as a number on a scale of 0 to 500, with the PSI value determined by the pollutant with the highest concentration.
The PSI considers six air pollutants: sulphur dioxide (SO2), particulate matter (PM10), fine particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO), and ozone (O3). A sub-index value is calculated for each pollutant, and the highest sub-index value becomes the PSI value.
Singapore computes the PSI using data from a network of air monitoring stations located around the country. The PSI is based on a scale devised by the United States Environmental Protection Agency (EPA) to provide a way for broadcasts and newspapers to report air quality daily.
The PSI figures enable the public to determine whether the air pollution levels in a particular location are good, unhealthy, hazardous, or worse. For example, a PSI value of 471 would indicate hazardous air quality.
Since 1999, the US EPA has replaced PSI with the Air Quality Index (AQI) to incorporate new PM2.5 and ozone standards. However, Singapore continues to use PSI and publishes both the 24-hour PSI value and 1-hour PM2.5 concentrations.
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PSI is determined by the pollutant with the most significant concentration
The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore. It is a number that indicates the level of pollutants in the air. PSI is calculated by first computing a sub-index value for each pollutant based on its ambient air concentration. The highest sub-index value is then taken as the PSI value. In other words, the PSI is determined by the pollutant with the most significant concentration.
The PSI considers six air pollutants: sulphur dioxide (SO2), particulate matter (PM10), fine particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO), and ozone (O3). During haze episodes, PM2.5 is the most significant pollutant.
The PSI is reported as a number on a scale of 0 to 500. The index figures enable the public to determine whether the air pollution levels in a particular location are good, unhealthy, hazardous, or worse. For example, an increase in the PSI value is associated with an elevated risk of out-of-hospital cardiac arrest on the same day of exposure.
Singapore also publishes a 3-hour PSI based on PM2.5 concentrations for the past 3 hours and 1-hour PM2.5 concentrations every hour. The PSI is based on a scale devised by the United States Environmental Protection Agency (EPA) to provide a way for broadcasts and newspapers to report daily air quality.
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PSI ranges are grouped by index values and descriptors, explaining the effects of the levels
The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore, represented as a number on a scale of 0 to 500. The PSI is determined by the pollutant with the most significant concentration. The PSI ranges are grouped by index values and descriptors, explaining the effects of the levels as follows:
- A PSI value of 0–50 indicates good air quality.
- A PSI value of 51–100 indicates moderate air quality.
- A PSI value of 101–200 indicates unhealthy air quality for sensitive groups.
- A PSI value of 201–300 indicates unhealthy air quality.
- A PSI value of 301–400 indicates very unhealthy air quality.
- A PSI value of 401–500 indicates hazardous air quality.
These PSI ranges enable the public to determine whether the air pollution levels in a particular location are good, unhealthy, hazardous, or worse. For instance, in June 2013, severe haze from forest fires in nearby Sumatra, Indonesia, pushed Singapore's PSI into the hazardous level for the first time.
It is important to note that Singapore's PSI calculations and definitions of PSI ranges have been linked to various health outcomes, including all-cause mortality and increased healthcare utilization. Therefore, the PSI is a critical tool for assessing and addressing air quality and its potential impacts on public health.
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Frequently asked questions
PSI is a type of air quality index used in Singapore, which is a number used to indicate the level of pollutants in the air. It considers six air pollutants: sulphur dioxide (SO2), particulate matter (PM10), fine particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO), and ozone (O3).
A sub-index value is computed for each pollutant based on its ambient air concentration. The PSI is then determined by the pollutant with the most significant concentration, i.e., the highest sub-index value. PSI is reported as a number on a scale of 0 to 500, with higher values indicating greater air pollution and health concerns.
While PSI is unique to Singapore, AQI is used in various countries with calculations and names differing across nations. AQI converts complex air quality data of various pollutants into a single number and colour, making it easier to present to the general public. AQI also has categories like "Good", "Moderate", and "Severe" to indicate increasing levels of health concern.
