What is the role of monsoons in the Asian brown cloud?

Monsoons play a significant role in the formation and persistence of the Asian brown cloud, a thick layer of air pollution that hangs over South Asia. During the monsoon season, heavy rains can initially help to clear pollutants from the atmosphere; however, the seasonal shifts in wind patterns can also transport and concentrate particulate matter. The monsoons can exacerbate air quality issues by stirring up dust and increasing humidity, which facilitates the chemical reactions that form secondary pollutants. Overall, while monsoons can temporarily alleviate pollution, they also contribute to the complex dynamics of the Asian brown cloud.