It will weaken into a low by the evening moving further in a north-northeasterly direction, the bulletin added.

Under the influence of the well-marked low, steep pressure gradient persists over north Bay.

All the maritime ports of the country have been advised to keep hoisting local cautionary signal number three.

All fishing boats and trawlers over north Bay and deep sea have been advised to take shelter and remain in shelter till further notice, it added.

Improvement in air quality

Dhaka’s air quality showed an improvement on Monday morning with the capital city ranking 40th worst in the Air Quality Index (AQI) due to rains triggered by the depression in the Bay of Bengal.

Dhaka had an AQI score of 75 at 10:00 am and its air quality was classified as ‘moderate’.

‘Moderate’ AQI means that the air quality of an area is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.

Generally, Dhaka’s air quality turns unhealthy during winter due to dry weather.

Pakistan’s Lahore, India’s Delhi and Afghanistan’s Kabul occupied the top three spots respectively with scores of 258, 243 and 216 which is ‘very unhealthy’.

AQI, an index for reporting daily air quality, is used by government agencies to inform people how clean or polluted the air of a certain city is, and what associated health effects might be a concern for them.

In Bangladesh, the AQI is based on five criteria pollutants -- particulate matter (PM10 and PM2.5), NO2, CO, SO2 and Ozone.

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