Dense fog can be seen over Northern India in this true color corrected reflectance image captured on Dec. 18, 2025, by the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument aboard the Terra satellite. The image shows the fog as a large patch of low white clouds across the region. The dense fog is expected to last the next few days and can cause near-zero visibility conditions, resulting in transportation issues across the region including road, railway, and air travel.
In the winter months, this area often encounters this type of dense fog, known as radiation fog. Radiation fog forms at night when there are cool ground temperatures, low wind speeds, and ample moisture in the air.
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