Bekasi's Foggy Phenomenon, This is What BMKG and BRIN Say

TEMPO.CO, Jakarta - The area of Bekasi and its surroundings have been foggy since Sunday, June 29, 2025, until the early Monday morning. The fog phenomenon in Bekasi also occurred in several areas in Jabodetabek such as Jakarta, Bogor, and Depok. The fog has lasted quite a long time, causing limited visibility and the air to feel cooler than usual. This rare occurrence has raised concern and speculation among the public, especially on social media. Many speculate that this phenomenon is related to air pollution or other environmental issues. What does BMKG say?

BMKG's Explanation Regarding the Bekasi Fog Phenomenon

In response to the phenomenon, the Meteorology, Climatology, and Geophysics Agency (BMKG) provided a scientific explanation regarding the cause and characteristics of the fog. As reported by the RRI page, the Head of the Weather Prediction and Early Warning Team of BMKG, Ida Pramuwardani, stated that the fog emerged due to the low surface temperature, ranging from 23-25 degrees Celsius, accompanied by high air humidity.

These conditions caused the concentration of water vapor on the surface and formed a fog layer. BMKG confirmed that this phenomenon is purely related to the weather and not due to pollution or hazardous substances.

BMKG explained that natural fog like this will disappear as the sun starts to warm the air. This is different from pollution-induced fog, which usually lasts longer and is difficult to dissipate because it contains fine particles. Therefore, the public is urged not to misunderstand this fog phenomenon. BMKG also emphasized the importance of referring to official information to avoid misinformation in the community.

Expert Perspective from BRIN

According to the page of RRI, Senior Researcher of the National Research and Innovation Agency (BRIN), Prof. Eddy Hermawan, also provided a similar explanation that the fog in low-lying areas like Bekasi is indeed rare, but not extraordinary.

He explained that cold temperature, high humidity, and calm wind are the main factors in fog formation. The dense urban characteristic and minimal green space also support the formation of fog as it triggers rapid surface heat release at night. The morning temperature dropping to 20-22C also thickened the fog on the surface.

Prof. Eddy also emphasized that fog is different from haze or smog. He explained that fog is water vapor that clings to the ground and will disappear once the sun rises. Whereas haze usually contains hazardous particles such as PM2.5 and can linger in the air. Therefore, he confirmed that the fog in Bekasi is harmless and not an indicator of pollution or environmental threat.

The public is advised to remain cautious of the impacts of fog such as disrupted visibility while driving, but there is no need to panic. Prof. Eddy Hermawan asserted that phenomena like the fog in Bekasi are not indications of extreme climate change. He emphasized that such conditions are only temporary and highly dependent on daily weather dynamics, such as high humidity and low surface temperature. He believes that understanding the causes of fog is crucial for the public not to misinterpret similar events in the future.

Clarifications from BMKG and BRIN are expected to dampen the wide-ranging speculations and concerns on social media. Several netizens have questioned whether the foggy phenomenon in Bekasi is related to pollution or even irrational matters. Therefore, Prof. Eddy suggested that the public be more active in following weather information from reliable institutions, such as BMKG, to avoid misinformation. A good understanding of atmospheric conditions and the causes of fog can help the public respond to similar situations more calmly and rationally.

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