Helena Joyce
The Pollutant Standards Index (PSI) is an air quality index used in Singapore to indicate the level of pollutants in the air. It is based on a scale devised by the United States Environmental Protection Agency (EPA) to report air quality on a daily basis. 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). The PSI is determined by the pollutant with the most significant concentration, with the index figures enabling the public to determine the air pollution levels and their associated health risks. Singapore's PSI is unique and ranges from 0 to 500, with the highest 3-hour PSI reading recorded at 471 in October 2015.
| Characteristics | Values |
|---|---|
| Type of Index | Air quality index |
| Pollutants considered | Sulphur dioxide (SO2), particulate matter (PM10), fine particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO), ozone (O3) |
| Location | Singapore |
| Scale | 0 to 500 |
| Interpretation | Indicates whether air pollution levels are good, unhealthy, hazardous, or worse |
| Highest 3-hour PSI reading | 471 on 20 October 2015 at 11 pm (GMT+8) |
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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 a scale devised by the United States Environmental Protection Agency (EPA)
- PSI considers six air pollutants: sulphur dioxide, particulate matter, nitrogen dioxide, carbon monoxide, ozone and fine particulate matter
- PSI is reported as a number on a scale of 0 to 500
- PSI helps the public understand air pollution levels and the associated health risks
The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore
Initially, the PSI was based on five air pollutants, but since April 1, 2014, it has also included fine particulate matter (PM2.5). Singapore also publishes 1-hour PM2.5 concentrations every hour, in addition to the PSI derived by averaging data collected over 24 hours. This 3-hour PSI is unique to Singapore and was introduced in 1997 to provide additional air quality information that would better reflect the current air quality situation. In 2016, the 3-hour PSI was phased out, as the 1-hour PM2.5 reading was found to be a better indicator of current air quality.
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. During haze episodes, PM2.5 is the most significant pollutant. Singapore has been regularly affected by smoke haze from forest fires in nearby Sumatra, Indonesia, which has pushed the nation's PSI into hazardous levels. The highest 3-hour PSI reading on record in Singapore was 471 on October 20, 2015, at 11 pm (GMT+8).
Singapore's PSI calculations and definitions have been correlated with several health outcomes, including all-cause mortality. For instance, every increment of 30 units in PSI correlated with an 8.15% increased risk of out-of-hospital cardiac arrest on the same day of exposure. Similar short-term associations were found for acute myocardial infarction and acute ischemic stroke. The PSI is an important tool for the public to assess air quality and potential health risks, and it plays a crucial role in guiding governmental responses and public health advisories during periods of poor air quality.
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PSI is based on a scale devised by the United States Environmental Protection Agency (EPA)
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 was initially based on five air pollutants, but since 2014 it has also included fine particulate matter (PM2.5). Singapore also publishes 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 air quality on a daily basis. The EPA's scale helps communicate to the public how polluted the air currently is or how polluted it is forecast to become. As air pollution levels rise, so does the AQI, along with the associated public health risk.
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). The concentrations of these pollutants in the ambient air are measured via a network of air monitoring stations located around Singapore. A sub-index value is computed for each pollutant based on its concentration in the air. The highest sub-index value is then taken as the PSI value, meaning the PSI is determined by the pollutant with the most significant concentration.
Singapore has been regularly affected by smoke haze from forest fires in nearby Sumatra, Indonesia, which has pushed the nation's PSI into hazardous levels. The highest 3-hour PSI reading on record in Singapore was 471 on 20 October 2015 at 11 pm (GMT+8). Singapore's PSI computations and definitions have been correlated with several health outcomes, including all-cause mortality and increased healthcare utilization.
Since 1999, the US EPA has replaced the Pollution Standards Index (PSI) with the Air Quality Index (AQI) to incorporate new PM2.5 and ozone standards. The AQI is divided into six categories that vary in severity regarding health concerns. An AQI value over 300 represents hazardous air quality, while below 50 the air quality is good. The AQI is based on the measurement of five major pollutants, and the highest AQI value is reported for a particular area.
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PSI considers six air pollutants: sulphur dioxide, particulate matter, nitrogen dioxide, carbon monoxide, ozone and fine particulate matter
The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore to indicate the level of pollutants in the air. The PSI considers six air pollutants: sulphur dioxide, particulate matter, nitrogen dioxide, carbon monoxide, ozone, and fine particulate matter.
Initially, the PSI was based on five air pollutants, but since April 1, 2014, it has also included fine particulate matter (PM2.5). Singapore publishes 1-hour PM2.5 concentrations every hour in addition to the PSI, which is derived by averaging data collected over the past 24 hours.
The PSI is determined by calculating a sub-index value for each pollutant based on its ambient air concentration. The pollutant with the highest sub-index value becomes the PSI value. During haze episodes, PM2.5 is typically the most significant pollutant.
The PSI is reported on a scale of 0 to 500, allowing the public to assess whether the air pollution levels in a given location are good, unhealthy, hazardous, or worse. Singapore's PSI readings have been linked to various health outcomes, including all-cause mortality and increased risks of out-of-hospital cardiac arrest, acute myocardial infarction, and acute ischemic stroke.
Other countries use different air quality indices with varying calculations and names, such as the Air Quality Health Index, Air Pollution Index, and the Air Quality Index (AQI) used by the US Environmental Protection Agency (EPA).
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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, which is a number used to indicate the level of pollutants in the air. PSI is reported as a number on a scale of 0 to 500, with the index figures enabling the public to determine whether the air pollution levels in a particular location are good, unhealthy, hazardous, or worse. 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).
Initially, PSI was based on five air pollutants, but since April 1, 2014, it has also included fine particulate matter (PM2.5). In addition to the PSI derived by averaging data collected over 24 hours, Singapore also publishes 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 air quality on a daily basis.
Singapore has been regularly affected by smoke haze from forest fires in nearby Sumatra, Indonesia, brought over by wind. These forest fires have been attributed to the slash-and-burn method used by several large plantation owners to clear their land. In June 2013, severe haze pushed Singapore's PSI into the hazardous category for the first time in its history. The highest 3-hour PSI reading on record in Singapore was 471 on October 20, 2015, at 11 pm (GMT+8).
It is important to note that Singapore's computation of PSI and the NEA's definitions of PSI ranges have been correlated with various health outcomes, including all-cause mortality and an increased risk of out-of-hospital cardiac arrest on the same day of exposure to high PSI levels.
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PSI helps the public understand air pollution levels and the associated health risks
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, helping the public understand air pollution levels and associated health risks. PSI is computed by measuring the ambient air concentration of 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 with the highest sub-index value determines the PSI value.
The PSI is reported on a scale of 0 to 500, with corresponding index values and descriptors explaining the effects of the levels. For instance, during a severe haze episode in Singapore in June 2013, the nation's PSI entered the "Hazardous" category for the first time. Research has shown that each increment of 30 units in PSI correlates with an increased risk of health issues, including an 8.15% higher chance of out-of-hospital cardiac arrest on the day of exposure.
The PSI helps the public understand air pollution levels by providing a simple numerical representation of complex data. Singapore publishes the PSI derived from averaging data collected over 24 hours, as well as 1-hour PM2.5 concentrations. These values are crucial for the public to assess the current air quality and make informed decisions to protect their health. During periods of high PSI, individuals may choose to reduce outdoor physical activity or stay indoors altogether to minimize exposure to harmful pollutants.
Additionally, the PSI enables the implementation of public health measures and policies. Governmental bodies often advise the use of masks, such as N95 respirators, and air purifiers during periods of high PSI to mitigate the health risks associated with air pollution. The PSI also serves as a tool for healthcare providers to anticipate potential increases in healthcare utilization. When PSI levels rise, there is a corresponding increase in Emergency Department visits and hospital admissions, allowing healthcare facilities to prepare and allocate resources effectively.
While Singapore utilizes the PSI, other countries have their own air quality indices. For example, Canada employs the Air Quality Health Index (AQHI), which ranges from 1 to 10+ and is based on scientific research identifying major pollutants impacting human health. The United States has developed the Air Quality Index (AQI), which also ranges from 0 to 500 and is divided into six categories indicating the severity of health concerns. These indices, along with the PSI, play a crucial role in communicating air pollution levels and associated health risks to the public, empowering individuals to take necessary precautions and make informed decisions regarding their health and well-being.
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Frequently asked questions
The Pollutant Standards Index (PSI) is a type of air quality index used in Singapore and, previously, the United States. It is a number used to indicate the level of pollutants in the air.
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 computed for each pollutant based on its concentration in the ambient air. The PSI value is then determined by the pollutant with the highest sub-index value.
The PSI is reported as a number on a scale of 0 to 500, with higher values indicating more severe air pollution.
The PSI enables the public to determine the level of air pollution in a particular location, which can help individuals assess the associated health risks. Governmental bodies may also use the PSI to provide health advisories and recommend appropriate actions, such as reducing outdoor physical activity or wearing masks.
