Temperature inversion, the reason of polluted dust in winter

Have you ever wondered why there is polluted smog instead of fog during winter in Bangkok or in the city? Also, PM 2.5 dust always appears during this time every year. What is the reason for this phenomenon? Follow ACU PAY to find out. 

As we know that the cause of PM 2.5 in Bangkok is mostly from fuel combustion of cars. The PM 2.5 volume that occurs during the summer and winter are not very different, but PM 2.5 concentration is high at the end of the year. This is because the climate of this period is conducive to Temperature Inversion or temperature fluctuations.

Temperature inversion; When the heat is in between the cold

Under normal conditions, the ground air has a higher temperature than the high air. This is because the heat from the sun has spread to the surface of the earth. In principle, the heat will rise and help make dust and pollution float up in the air, and then the wind will blow to disperse dust and pollutants, reducing dust and pollution problems.

However, under the Temperature Inversion, it will be the opposite. This occurs when the air on the ground is cooler than air at higher levels. The air at a higher level will have a higher heat. Moving up to another higher level, there will be cooler air. 

Therefore, it’s like hot air coming in the middle between cold air on the ground and cold air at a high level. Cold air on the ground will not be able to rise into the upper atmosphere, and dust and pollutants will not be floated up, causing dust and air pollution to accumulate beyond the standard.

Temperature Inversion, the cause of smog in winter

The reason why the Temperature Inversion usually occurs in winter is because the air on the ground is relatively cold and has an inverse temperature. This often occurs in the middle of the night near dawn because the earth’s surface is emitting heat. At the end of the year, there are often northeastern monsoon winds blowing cold air mass into Thailand. The dust and pollutants are trapped below, accumulating until it becomes PM 2.5.

How to solve the problem

PM2.5 is increasing in severity. It’s true that we cannot solve the climate change phenomenon, but we can solve the cause of the problem of smog and air pollution by cooperation between government, private and public sectors.

Whether it’s controlling automobile exhaust, releasing industrial toxic smoke, smoke from forest fires, and fire from humans. If everyone cooperates, our winter will definitely return to fresh air.

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