Dhaka's air again second worst

Dhaka's air quality was ranked second worst in the world for the second consecutive day on Saturday, reports UNB.
With an air quality index (AQI) score of 208 at 8:58 am, Dhaka's air was categorised as 'very unhealthy'.
An AQI between 101 and 200 is considered 'unhealthy', particularly for sensitive groups, while an AQI between 201 and 300 is said to be 'very unhealthy'.
India's Kolkata and Delhi occupied the first and third spots on the list, with AQI scores of 247 and 171, respectively.
In Bangladesh, the AQI is based on five criteria pollutants -- Particulate Matter (PM10 and PM2.5), NO2, CO, SO2 and Ozone.