Air pollution still remains one of the top-most challenges for Bangladesh. Dhaka has been ranked as the second most polluted city in the world.

Dhaka's air quality index (AQI) was recorded at 190 at 9:00am yesterday.

India's capital Delhi and Kuwait's capital Kuwait City occupied the first and third spots, with AQI scores of 257 and 158. An AQI between 101 and 200 is considered "unhealthy".

An AQI between 201 and 300 is said to be "poor", while a reading of 301 to 400 is considered "hazardous". AQI, an index for reporting daily air quality, is used by government agencies to inform people how clean or polluted air of a certain city is, and what associated health effects might be a concern for them.