Air pollution index for Dhaka rated the city's air as “hazardous,” meaning that inhabitants faced significant health risks

With an AQI score of 311 at 8:30 am on Friday, Dhaka was once again at the top of the list of cities in the world with the poorest air quality.

The air quality index for Dhaka rated the city's air as “hazardous,” meaning that inhabitants faced significant health risks.

With AQI values of 251, 199, 198, and 192, respectively, Pakistan's Karachi, India's Delhi and Kolkata, and Pakistan's Lahore took the second, third, fourth, and fifth places on the list.

The air quality is deemed "unhealthy for sensitive groups" when the AQI value for particle pollution is between 101 and 150; "unhealthy" when it is between 150 and 200; "very unhealthy" when it is between 201 and 300; and "hazardous" when it is 301 or higher, posing major health risks to locals.

People may find out how clean or dirty a city's air is, as well as any potential health risks, by using the Air Quality Index (AQI), a daily reporting tool.

Particulate matter (PM10 and PM2.5), NO2, CO, SO2, and ozone are the five pollutants that make up Bangladesh's Air Quality Index (AQI).

Air pollution has always been a problem in Dhaka. Usually, the winter months bring on unhealthy air quality, which then improves during the monsoon.

The World Health Organization (WHO) estimates that air pollution kills seven million people globally annually, mostly as a result of higher mortality rates from heart disease, stroke, lung cancer, chronic obstructive pulmonary disease, and acute respiratory infections.

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