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TERI Information Digest on Energy and Environment
Year : 2002, Volume : 1, Issue : 1
First page : ( 110) Last page : ( 111)
Print ISSN : 0972-6721.

Transportation and environment


[140]A reconnaissance of 'traffic noise pollution in the city of Patna'
Singh NM and Rao SN. 2001The noise generated from traffic is a major source of environmental pollution. This is substantiated by the results of continuous monitoring of equivalent noise level (Leq) at a number of sensitive, residential, commercial and industrial areas during day and night in 1999. The measurements have been carried out continuously for a period of 12 to 18 hours a day (covering the entire period over which reasonable traffic actually exists) using an integrating SLM (sound level meter). The existing noise pollution status of Patna urban environment with emphasis on objective measurement is reported. The data were compared with the published data of other towns and cities and the possible factors responsible for change in the noise levels are discussed. The study found that the traffic noise, at the present time, is the predominant source of annoyance, as no other single noise is of comparable importance. Such a finding is not surprising because of the large number of automotive vehicles in comparison with other machines. The authors recommended that noise levels can be reduced by employing various methods, such as, restriction of heavy vehicular traffic during day time in residential as well as residential-cum-commercial zones. The diversion of traffic flow, provision of smooth road surface, control of speed by speed breakers, strict enforcement of traffic rules, installation of traffic signal lights at various junctions in the city are some of the other methods suggested. Banning of air pressure horns and silencerless vehicles, and plantation of trees having dense foliage on the road sides, can also bring down the equivalent levels.
(2 figures, 5 tables, 8 references)
Indian Journal of Environmental Health43(4):138–143
Central Laboratory,
Bihar State Pollution Control Board, Patna, India


[141]The carbon monoxide levels in automobile exhaust: a case study in Chidambaram town
Ramamurthy N and Thirumarran M. 2001The exhaust gases from automobiles constitute about 75% of air pollution. Among the various pollutants emitted from vehicles, CO is the primary pollutant and a very toxic one. The CO monitor method was used to measure the CO level in Chidambaram town. The concentration of CO gas emitted by automobile exhaust present in ambient air at roadside was recorded using Co-84 monitor. The sampling was carried-out for two days, at each location in one hour time intervals. The sampling hours were so chosen that they were peak traffic hours. From the study, it is evident that the CO level is closely related to the density of motor vehicles plying on the roads. With increase in number of motor vehicles CO level also increases, which pollutes the roadside environment severely in future. It is also found that among the automobiles, two-wheelers are the chief sources of roadside pollution and other factors mentioned above also influence the accumulation of CO concentration. It is therefore suggested that (1) enforcement of strict emission norms and standards are necessary; (2) proper planning and maintenance of cities, towns, and roads and also wide spaces to avoid traffic congestion and provision for air dispersal are to be provided; (3) encourage the use of bicycles; and (4) shift from personalised mode to public transport.
(2 figures, 1 table, 9 references)
Indian Journal of Environmental Health43(4):144–147
Department of Physics, Annamalai University, Annamalainagar- 608 002


[142]Traffic noise in South Chennai
Chowdary MJR and Thanasekaran K. 2001Ambient noise levels due to traffic were measured at several locations in South Chennai. The noise levels were found to be objectionably high at all the locations and were in the range of 92-95 dB. The noise levels measured at some of the same locations earlier were in the range of 71-84 dB. This alarming situation requires long-term corrective measures and some immediate measures are also called for. It is, therefore, urgently necessary to devise and implement short- and long-term noise control measures in Chennai. Some important specific recommendations for reducing the traffic noise levels in Chennai are: (1) smooth flow of traffic should be ensured, (2) 'No horn' rule should be enforced near important educational institutions and hospitals, (3) proper maintenance of buses and lorries should be ensured as they constitute the major source of noise on the roads of Chennai, (4) comprehensive noise control legislation should be enacted and implemented, (5) awareness should be created in the minds of the people about the noise pollution and its impacts, and (6) monitoring of noise should be done at important traffic junctions.
(2 figures, 5 tables, 6 references)
Journal of Institute of Engineers (Environmental Engineering Division)82(Sept):22–26
Centre for Environmental Studies,
Anna University, Chennai


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