Thursday, 7 July, 2022

‘Shahbag’s air most polluted, Gulshan the noisiest’

‘Shahbag’s air most polluted, Gulshan the noisiest’

The air quality in the Shahbagh area is the worst, while the air quality in the national parliament area is the least polluted in the capital. Gulshan-2 area is the noisiest in the city.

The Stamford University Center for Atmospheric Pollution Studies (CAPS) announced this at a press conference at the National Press Club on Sunday.

CAPS collected and analysed air and noise quality samples at 10 different locations in the capital from April 2021 to March 2022.

Ahsan Manzil, Abdullahpur, Matijheel, Shahbagh, Dhanmondi-32, Parliament area, Tejgaon, Agargaon, Mirpur-10, and Gulshan are the areas from where the samples were collected.

CAPS Chairman Prof. Kamruzzaman Majumder said, "The air quality of 10 places in Dhaka city is "unhealthy" according to AQI (Air Quality Index). The average annual PM 2.5 concentration in those areas was 77.1 microgrammes per cubic metre (µg/m3) of air, which is 5.1 percent more than the standard value (15 microgrammes). "

In addition, the average annual presence of PM10 was 105 micrograms per cubic metre (µg/m3) of air, which is on average 2.1 times higher than the annual standard (50 micrograms), he said.  The air in Shahbagh had 85 µg/m3 of PM2.5, followed by Tejgaon and Gulshan-2 with 79 µg/m3 and Motijheel with 78 µg/m3.

Parliament area was found to be the least polluted in terms of air pollution, with 70 µg/m3 of PM2.5.

Gulshan-2 was the noisiest part of the capital, with noise levels reaching 95.44 decibels (dB). Tejgaon was the quietest place in Dhaka, with average sound levels recorded at 89dB.

According to the Department of Environment (DoE), the acceptable noise limit is 55dB during the daytime and 45dB at night in residential urban areas. A sound level above 70dB is considered to be extreme by the World Health Organization (WHO).