Dhaka's air quality continued to be in the 'moderate' zone.
With an air quality index (AQI) score of 59 at 8.56 am on Saturday, the city ranked 23rd in the list of world cities with the worst air quality.
An AQI between 50 and 100 is considered ‘moderate’ with an acceptable air quality.
South Africa’s Johannesburg, Pakistan’s Lahore and Iran’s Tehran occupied the first three spots in the list, with AQI scores of 172, 160, 148, arespectively.
An AQI between 101 and 200 is considered 'unhealthy', particularly for sensitive groups.
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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.
