Bangladesh’s capital was again ranked the worst in Air Quality Index (AQI) yesterday morning.

Dhaka had a score of 195 at 9am, which means the city’s air quality was classified as unhealthy.

When the AQI value is between 151 and 200, there is an increased likelihood of adverse effects and aggravation to the heart and lungs.

Dhaka ranked worst in AQI on Friday morning with a score of 245, indicating that the air quality was ‘very unhealthy’.

The AQI, an index for reporting daily air quality, tells people how clean or polluted the air of a certain city is, and what associated health effects might be a concern for them.

Bangladesh’s overcrowded capital has been grappling with air pollution for a long time. The quality usually improves during monsoon.

The United States Environmental Protection Agency (EPA) has developed the AQI, which is used to report air quality.

This AQI is divided into six categories indicating increasing levels of health concern.

An AQI value over 300 represents hazardous air quality and below 50 the air quality is good.