Getting to know 'Haze', the phenomenon causing the sky to look hazy lately

Published 2026-10-17

During periods when weather conditions change frequently, many people may notice that the sky or the scenery around them does not look as bright as usual and appears hazy, as if covered in dust. This phenomenon is often called 'haze,' a weather condition that affects visibility and can potentially impact public health.

Haze is a weather condition where a large number of very small, dry particles are suspended in the air. These particles can come from various sources, such as dust from traffic, construction, or open burning. When these particles accumulate densely in the air, they reduce visibility, causing the sky to lose its clarity and take on a grey or whitish, hazy appearance.

The key difference with haze is that the particles are dry, unlike fog, which is caused by tiny water droplets condensing in the air. The occurrence of haze is often associated with stagnant weather conditions, calm winds, or temperature inversions, which prevent dust particles from dispersing and cause them to accumulate at low levels near the ground.

For the general public, taking care of your health during periods of haze is important. You should avoid outdoor activities for long periods. If you must go outside, you should wear a face mask to prevent inhaling small dust particles, especially those with underlying respiratory conditions or allergies.

In conclusion, haze is a natural phenomenon caused by pollution and dust in the air. Regularly following weather forecasts and air quality reports will help us prepare and protect ourselves appropriately from potential impacts.

Sources: Thai PBS

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