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Particle level in city motor vehicle areas much higher, says study

Kamrun Nahar | November 21, 2017 00:00:00


Choking air pollution at Tejgaon in Dhaka: Evidence shows air pollution can cause diseases like cancer and other serious respiratory illness. — FE file photo

Level of particles below a certain size (PM 2.5µg/m3) in mixed and motorised areas was, on average, 182 and 272 per cent higher respectively than that of non-motorised areas, a study showed.

The level already exceeded the maximum recommended limit for 24 hours (65µg/m3) in predominantly mixed and motorised areas in 12 hours, suggesting a much higher pollution potential over a typical 24-hour period in motorised traffic areas. This is recommended in the Environmental Conservation Rules 2010.

Additionally, levels are likely underestimated as other in-depth studies have reported dry season (November to April) PM 2.5 levels being 8-13 times WHO limits.

These were disclosed in a study titled 'Motorisation of Dhaka Transport: Cost & Consequences' under 'Research for Ambient air (PM2.5) pollution in different areas of Dhaka city'. The comparative study was conducted at 12 locations in Dhaka city. WBB-Trust, Institute of Wellbeing, Stamford University, Bangladesh University of Engineering and Technology in collaboration with Global Environment Consultants Ltd (GECL Monitoring Team) conducted the study from 01-08 August this year.

The 12 spots are: B.C. Dash Street Road, Lalbagh, Kobiraj Lane, Patuatuli, Islampur Road, (Vehicle Free), Natun Rasta, Zigatola, Dhanmondi, Dhaka University campus -- in front of Arts Faculty, (Predominantly Non-Motorised Transport), (Predominantly Non-Motorised Transport), Saat Masjid Road -- in front of Rainbow Hospital (Mixed), Nilkhet (Mixed Intersection), Bijoy Nagar Paltan (Mixed), Suhrawardy College gate -- in front of Muktijoddha Tower 1 (100 per cent Motorized Vehicle), Shahbagh Square -- near Police Box area (100 per cent Motorized Intersection), Gulshan-1 (Gol Chattar) (100 per cent Motorized Intersection), Nazrul Islam Avenue, Karwan Bazar (100 per cent Motorized Intersection), Mirpur-10 (Gol Chattar) (100 per cent Motorized Vehicle).

Prof Ahmad Kamruzzaman Majumder, chairman of department of Environmental Science at Stamford University, told the FE that the study was conducted on three types of roads from 6:00 am till 6:00 pm in traffic corridor. Although a major source of air pollution is not known, it is thought that brick kilns and construction works are some of the major sources of air pollution in Dhaka. The study was conducted during the monsoon and there was no construction.

"We have suggested intervention in transport sector and investment for creating opportunity for cycling and walking, rearrangement of the mass transport system," he said.

If the study was done in dry season, the result could have been further serious, he added. Dhaka is going to become next Beijing or Delhi, the 4th and 1st in air pollution.

Particles below a certain size (PM 2.5µg/m3) are thought to be the most relevant for health effects biomass burning, brickfields, industry and vehicles.

Larger particles are generally filtered by the nose and throat by cilia and mucous membranes, smaller particles can penetrate the bronchi and lungs to cause diseases.

WHO reports three million premature air pollution related deaths, disproportionate number coming from low and middle-income countries (88 per cent), particularly South-East Asian and Western Pacific regions.

Strong evidence links air pollution to cancer, cardiovascular disease and respiratory diseases (asthma, chronic obstructive pulmonary disease and bronchitis).

msshova@gmail.com


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COMPANY YCP HIGH LOW CLOSE %CHG
PARAMOUNT 17.0 18.7 16.7 18.7 10%
GLOBALINS 12.8 14.0 12.7 14.0 9.375%
MEGHNACEM 91.1 99.9 92.1 98.1 7.6839%
PROVATIINS 16.4 17.7 16.5 17.5 6.7073%
PURABIGEN 12.4 13.5 12.5 13.2 6.4516%
ASIAINS 16.7 17.7 17.0 17.6 5.3892%
KARNAPHULI 15.0 15.9 15.0 15.8 5.3333%
REPUBLIC 25.1 27.2 25.3 26.4 5.1793%
MIDASFIN 23.1 24.4 23.3 24.2 4.7619%
PRIMEINSUR 12.7 13.6 12.9 13.3 4.7244%
COMPANY YCP HIGH LOW CLOSE %CHG
GLOBALINS 14.0 14.0 12.7 12.7 10.2362%
PARAMOUNT 18.7 18.7 16.7 17.0 10%
GREENDELT 58.9 59.0 52.5 54.0 9.0741%
PURABIGEN 13.3 13.5 12.5 12.5 6.4%
PROVATIINS 17.4 17.7 16.5 16.5 5.4545%
MEGHNACEM 97.0 99.9 92.1 92.1 5.3203%
IFIC1STMF 4.2 4.2 4.0 4.0 5%
POPULAR1MF 4.2 4.2 4.0 4.0 5%
DAFODILCOM 34.9 35.1 33.3 33.3 4.8048%
FASFIN 13.5 13.6 12.8 12.9 4.6512%
COMPANY YCP HIGH LOW CLOSE %CHG
ALLTEX 14.0 14.4 12.6 12.6 -10%
AL-HAJTEX 98.2 105.3 88.4 88.4 -9.9796%
ISNLTD 31.5 28.4 28.4 28.4 -9.8413%
CAPMIBBLMF 11.5 11.6 10.4 10.4 -9.5652%
JUTESPINN 148.4 152.9 133.6 134.6 -9.2992%
KEYACOSMET 7.6 7.3 6.8 6.9 -9.2105%
KTL 29.7 30.2 26.8 27.0 -9.0909%
MLDYEING 39.6 40.3 35.8 36.2 -8.5859%
IBP 36.9 37.0 33.5 33.8 -8.4011%
GQBALLPEN 82.5 84.5 75.0 76.1 -7.7576%
COMPANY YCP HIGH LOW CLOSE %CHG
AL-HAJTEX 88.4 105.3 88.4 101.3 -12.7345%
ALLTEX 12.6 14.4 12.6 14.4 -12.5%
GQBALLPEN 75.0 84.5 75.0 84.4 -11.1374%
CAPMIBBLMF 10.4 11.6 10.4 11.6 -10.3448%
JUTESPINN 133.6 152.9 133.6 149.0 -10.3356%
KTL 27.0 30.2 26.8 29.9 -9.699%
MLDYEING 36.2 40.3 35.8 39.7 -8.8161%
IBP 33.9 37.0 33.5 37.0 -8.3784%
PRIMELIFE 53.8 59.7 53.8 58.0 -7.2414%
ARAMIT 431.1 463.0 429.0 463.0 -6.8898%