Haze Singapore Reading
Air pollution in Singapore has risen to dangerous levels, with the three-hour pollution index reaching its highest level on record as smoke from an Indonesian forest fire engulfs the city state. The Air Quality Index (AQI), a measure of air quality in Singapore, rose to 321 on Tuesday, the second highest in the country’s history.
But in the last three hours of the day, the level dropped slightly to 282 to 23. PSI surpassed an unhealthy level for the first time since 2016, when the western part of Singapore reached 103 at 4 p.m., according to SEPA.
Meanwhile, the NEA’s air quality index, which it says is a better indicator of current air quality, was at normal levels in parts of Singapore on Sunday.
PM2.5 levels ranged from 26 micrograms per cubic metre to 37, with the highest levels measured in the central part of the island. This was the second highest single-day figure in Singapore’s history, according to the NEA.
In the early afternoon, the measurement gradually dropped to the lower end of the unhealthy range. PM2.5 values ranging from 97 to 110 micrograms per cubic metre, which are in the medium and unhealthy range. It was the second highest reading in Singapore’s history, after the 2.0 reading of 97 and 110, both at the top end, and the highest in a single day in history.
PSI levels range from 101 to 200, which is why the National Environment Agency (NEA) has recommended that the public limit outdoor activities. PSI is on a scale of 0 to 500, and the range is defined as the difference between normal and unhealthy PM2.5 levels in a single day.
At 10 p.m. on 19 June 2013, PSI reached 321, its highest level since 21 June 2013, and reached an all-time high on 1 July 2014 at 11 a.m. On 18 June 2012, PM2.5 in the Singapore Air Quality Index reached all record levels for the first time, according to the National Environment Agency (NEA). But after June 20, it gradually began to deteriorate, with values increasing from June 22 to 23.
According to Singapore government guidelines, a sustained PSI of more than 2.5 parts per million (ppb) can be life-threatening for a sick or elderly person.
Singapore’s air quality worsened on Tuesday, with the pollutant index (PSI) exceeding unhealthy levels in parts of the island. In the latest crisis that erupted Monday, the highest air pollution in the city the state at the time of writing – was 226 in September 1997, according to the National Environmental Protection Agency.
By 8 a.m., the PSI readings were between 124 in western Singapore and 107 in the east and 124 to 121 in eastern Singapore, according to the National Environmental Protection Agency (NEPA). It had entered the unhealthy range at 1am and by now you may have noticed that Singaporeans are being updated throughout the day.
In 1991, Singapore’s Ministry of Environment introduced the Pollutant Standards Index (PSI), which measures the level of particulate matter, fine dust and nitrogen oxides in the air.
Singapore has four major air pollutants: sulphur dioxide (SO2), nitrogen oxide (NOx), fine particulate matter (PM2.5), ozone (ozone) and carbon monoxide (CO2). However, the Singapore PSi is calculated for only one of these four pollutants: particulate matter is important, not for all.
To reiterate, the health warnings issued by the authorities are based only on the 24-hour PSI, which measures particulate matter and nitrogen oxide pollution in the air. There is no evidence of the human health effects of air pollution, which are based on its impact on blood pressure, heart rate, blood oxygen levels, lung function and blood sugar levels.
The haze in Singapore is back, and particulate matter and nitrogen oxide pollution in the city are rising – the state’s air is creeping to unhealthy levels. This is the second consecutive day of high air pollution in Singapore and the third consecutive day of a PSI above 50.
PSI values across the island have reached unhealthy levels since 18 September 2019, and anyone who understands PSI values has a good idea of what they look like from the outside and knows that they are not good.
According to the NEA, a total of 238 hotspots have been discovered in Sumatra, and Indonesia remains the second most polluted country in the world, while Malaysia is fourth.
The smoke and haze will be blown in by the prevailing winds that are hitting Singapore and parts of the Malaysian peninsula, but it is forecast to blow south and south, meaning Singapore could continue to experience foggy conditions as the weather remains dry on Sumatra. While air quality in Singapore appears to be normal, prevailing winds are forecast to blow from the south-east to the south – meaning the smoke will cause haze over the island.