Dhaka’s air quality remains ‘moderate’
Dhaka's air quality continued to be in the 'moderate' zone on Sunday morning.
With an air quality index (AQI) score of 63 at 9:00am, the metropolis ranked 20th in the list of world cities with the worst air quality.
Saudi Arabia's Riyadh, Pakistan's Lahore and Kuwait's Kuwait City occupied the first three spots in the list, with AQI scores of 168, 167 and 163 respectively.
An AQI between 50 and 100 is considered 'moderate' with an acceptable air quality. However, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
An AQI between 101 and 200 is considered 'unhealthy', particularly for sensitive groups.
Similarly, an AQI between 201 and 300 is said to be 'poor', while a reading of 301 to 400 is considered 'hazardous', posing serious health risks to residents.
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.
Dhaka has long been grappling with air pollution issues. Its air quality usually turns unhealthy during winter and improves during monsoon.
With the advent of winter, the city's air quality starts deteriorating sharply due to the massive discharge of pollutant particles from construction works, rundown roads, brick kilns and other sources. -UNB