Dhundh

Dhundh (धुंध) refers to a state of reduced visibility, often caused by atmospheric particles like dust, smoke, haze, or fog. The term, commonly used in Hindi, Urdu, and other related languages of the Indian subcontinent, is similar in meaning to "smog" or "haze" in English, though it can encompass a broader range of visibility-reducing conditions.

The intensity of dhundh can vary significantly, ranging from a slight blurring of distant objects to a near white-out condition. Severe dhundh can disrupt transportation (affecting flights, road travel, and train services) and can also pose health risks, particularly for individuals with respiratory problems.

Dhundh is often associated with seasonal changes, such as the winter months in North India, where temperature inversions trap pollutants near the ground. It can also be caused by specific events like dust storms, wildfires, or industrial emissions. The impact of dhundh on air quality is a major concern in many urban areas. Measures to combat dhundh typically involve controlling pollution sources and mitigating the factors that contribute to its formation.