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ASSESSMENT OF NOISE POLLUTION IN
GOPALGANJ CITY
1. Introduction:
Noise pollution consistently ranks high on the list of citizens concerns [1]. The sources
responsible for noise pollution are traffic noise, industrial noise, construction activities, and
community noise. Traffic noise is one of the significant sources of the noise compared to the
other sources. Traffic noise, itself, is categorised into four major groups: road traffic noise,
airport noise, railway noise, and seaport noise [2]. The several adverse effects of noise pollution
are due to road traffic operation on individuals which include annoyance, loss of concentration,
and reduction of work efficiency, apart from other physiological and psychological damages
and also road traffic noise intensity undergoes geometric progression in pace with economic,
and technological growth [3, 4]..
Gopalganj is a rapidly growing city in Bangladesh. In last 10 years a public university, hospital,
medical college and industries were constructed in this city and many people are coming here
for job and education. As a result, vehicles and noise pollution are increasing day by day.
This paper shows the level of noise pollution in Gopalganj city. For this purpose noise
levels have been measured at Launchghat of the city from 9 AM to 10 AM during the working
days. This data have been analyzed to calculate various noise parameters (Chowdhury et al.,
2010).
Keywords: Noise pollution, Launchghat, Gopalganj, traffic jams noise, alarming, 2.
Methodology:
2.1. Study area:
The study area was Launchghat, Gopalganj Sadar.Gopalganjj is a city on the banks of the
Madhumati . It is one of the oldest cities in continuous habitation in the world, with a history
dating back to more than 3000 years.
Table 1 shows the geographical and meteorological aspects of the area on that day (16
March 2020).
Figure 1 show the map of Gopalganj Sadar where the red circle shows the study area.

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Table 1. Geographical and meteorological aspects of Launchghat on March 16, 2020
2.2. Data collection:
The survey was an instrumental survey and the source of the noise was traffic jams
noise. The type of noise was continues. Most of the vehicles were autos and mahendras, some
were rickshaws, buses and motorbikes. Noise levels were measured by using ‘A’ weighting
network type Sound Level Meter (CEM Model DT-8850). The meter was held 1.3 to 1.5 m
above the ground surface and its sound level was in low (35-100 dB) mode. Time weighting
for the meter was fast. The survey was conducted in the middle of March dated on March 16,
2020 and we select day time for it. The time was from 9 AM to 10 AM and we took 31 data in
2 minutes interval.
2.3. Noise pollution indices:
Different types of noise pollution indices were calculated to obtain the noise pollution levels.
Different values like L10, L50 and L90 were calculated from the SPL. These parameters are used
to measure Noise Climate (NC), The equivalent continuous equal energy level (Leq), Noise
Pollution Level (Lnp), Mean sound level ( ), Sound power level (LP) (Cornwell and Davis,
2008). Following equations were used to calculate the noise pollution indices:
(1)
(2)
(3)
Serial No Parameter Values
1 Latitude 23°00'29.3" N
2 Longitude 89°49'41.6" E
3 Maximum temperature 33 C
4 Minimum temperature 22 C

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(4)
(5)
Where, NC is Noise Climate; L10 is the level of sound exceeding for 10% of total time of
measurement or Peak Noise Level; L50 is the level of sound exceeding for 50% of total time of
measurement or Mean Sound Level; L90 is the level of sound exceeding for 90% of total time
of measurement or Background or Residual Noise Level; Leq is the equivalent continuous equal
energy level and; Lnp is the Noise Pollution Level; N is the total number of sample taken; Li is
the noise level in dBA of the ith sample; ti is the fraction of total sample time (Hunashal and
Patil, 2012).
3. Results and Discussion:
Figure 2 show the sound pollution level between 2.45 AM to 3.42 PM where the time interval
is 2 minutes. Lauchghat is a mixed area and the standard level of noise is 50 dBA at day time
but the graph shows a different and devastating result where all the sound levels are over 65
dBA and maximum is 90.739 dBA while minimum is 68.50 dBA. The Npl was calculated
90.739 dBA.
4. Recommendation:
Noise pollution is increasing day by day so there are some ways to decrease it. They are: (a)
strongly prohibit hydraulic horns; (b) new rules and regulations should be imposed; (c) creating
awareness among people by mass media; (d) restrict heavy vehicle at working time; (e) strict
monitoring should be involved; (f) improvement of traffic condition.
5. Conclusion:
Noise pollution is now a global issue and in the developing countries like Bangladesh it can be
major issue if we can not
6. References:
[1] M. J. Crocker, Handbook of Acoustics, John Wiley, New York, 1998.
[2] K.D. Kryter, Handbook of Hearing and the Effects of Noise, New York Academic Press,
1996.

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[3] K. Ahmed, “A Study on Noise Pollution in Dhaka City”, Department of Environment,
Bangladesh, 1998.
[4] W. Passchier-Vermeer, “Noise and Health”, The Hague: Health Council of the
Netherlands,
Publication No A93/02E, 1993.
Alberola, J., Flindell, H. & Bullmore, J. (2005). Variability in road traffic noise levels.
European Commission, Environmental Noise
Directive 2002/49/EC; Off J European Communities; L189, 12-25.
Bhosale, B.J., Late. A., Nalawade, P.M., Chavan, S.P. & Mule, M.B. (2010). Studies on
assessment of traffic noise level in
Aurangabad city. Noise Health, 12, 195-198.
Evans, G.W. & Hygge. S. (2000). Noise and performance in children and adults. In Prasher
D, (Eds.), Handbook of Noise and
Health.
Hunashal, Rajiv B. & Patil, Yogesh B. (2011). Environmental noise pollution in Kolhapur
city, Maharashtra, India. Nature
Environment & Pollution Technology, 10(1), 39-44.