Thick fog limited visibility in Ho Chi Minh City on Wednesday morning and will occur on multiple days until the end of the year.

The foggy sky, gradually clearing above 100 meters, obscured high-rise buildings and enveloped the city, contrasting sharply with the clear air of previous mornings.

Le Dinh Quyet, head of the forecasting department at the Southern Regional Hydrometeorological Center, noted that fog is expected to frequently occur from now until the end of the year.

Quyet explained this phenomenon is the result of high humidity in the late afternoon and nighttime rain.

In the early morning, lower temperatures and a subtropical high pressure moving westward push moisture from the sea into the area, increasing the condensation of low-level water vapor and creating fog.

“To determine whether this fog contains pollutants, we must rely on monitoring data for suspended dust and fine dust levels,” Quyet added.

Typically, Ho Chi Minh City experiences foggy days in the last months of the year, sometimes accompanied by photochemical smog due to the tropical convergence zone and cold air moving southward.

The weather during this period is often cloudy, with no sunshine, low temperatures, and high humidity. 

Condensation nuclei in the atmosphere cause water vapor to adhere to them, creating smog.

Furthermore, the lack of sunlight prevents heating from the ground up, giving rise to a temperature inversion layer trapping emissions from traffic, industry, and daily activities and resulting in increased pollution accumulation.

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