Cooler air blamed for PM2.5 rise

Cooler air blamed for PM2.5 rise

A cloud of ultra-fine dust particles known as PM2.5 has returned to Bangkok due to cooler temperatures. (Bangkok Post file photo)
A cloud of ultra-fine dust particles known as PM2.5 has returned to Bangkok due to cooler temperatures. (Bangkok Post file photo)

A cloud of ultra-fine dust particles known as PM2.5 has returned to Bangkok due to cooler temperatures, with air quality indicators across the capital registering unhealthy levels of the harmful micro pollutant.

According to the Pollution Control Department (PCD), the concentration of PM2.5 pollutants in Bang Phlat reached 53 microgrammes per cubic metre (µg/m³) yesterday -- exceeding the PCD's safe threshold of 50 µg/m³.

The PCD said PM2.5 levels are likely to increase in the next couple of days across the city, and warned residents about the health risks posed by the micro pollutant.

Officials said a high pressure system above China -- which has lowered temperatures in the northern part of Thailand -- is causing dust to accumulate as the air stagnates.

While Bangkok has not registered unhealthy levels of PM2.5 pollutants in the past several months, earlier in the year PM2.5 levels soared beyond unhealthy levels, prompting officials to adopt emergency measures -- including spraying water from high-rise buildings.

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Vocabulary

  • accumulate: to get more and more of something over a period of time - เก็บสะสม, สะสม, สั่งสมมานาน
  • adopt: to accept or to start using something new - นำมาใช้
  • measure: a firm action taken to solve a problem or stop a dangerous unpleasant situation - มาตราการ
  • micro (adj.): very small -
  • PM2.5 (n): atmospheric particulate matter (PM) with a diameter of less than 2.5 micrometres, which is about 3% the diameter of a human hair. It can lodge in the lungs and enter blood vessels, leading to respiratory and cardiovascular disease -
  • pollutant (noun): something that causes pollution - สารพิษ, ของเสีย, สิ่งที่ทำให้สกปรก
  • soar: to rise very quickly to a high level - มีความหวังสูง,พุ่งพรวดขึ้น
  • stagnate (verb): to stop developing or making progress - หยุดไม่เจริญ, หยุดนิ่ง
  • threshold: the level or point at which you start to experience something, or at which something starts to happen - จุดเริ่มของประสบการณ์หรือเหตุการณ์ใหม่ๆ

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