Organized by:
Supporting Organizations:

 

Print version










STATUS AND MANAGEMENT OF BENZENE POLLUTION IN URBAN ATMOSPHERE OF DELHI
Sushil Kumar Tyagi; Dentral Pollution Control Board, East Arjun, Nagar, Delhi

ABSTRACT

The benzene and toluene are potentially toxic air pollutants among volatile organic compounds (VOCs). Benzene is present in both exhaust and evaporative emission from vehicles and fuel delivery outlets in urban atmosphere. Benzene content in gasoline has been reduced from 5% to 3% since April 2000 in metropolitan cities and further from 3% to 1% since November 2000 in national capital territory of Delhi. The present paper gives an account of Benzene levels in Delhi’s urban environment measured since phasing out of leaded gasoline in 1998 & after introduction of CNG in commercial vehicles during 2001 in Delhi, till date. Active, passive and on line techniques have been employed for measurement of benzene and toluene. A significant decrease was observed in their levels in the initial stage. The concentrations of benzene at all the sites were found higher than the limit values prescribed in the UK, (16µgm/ m3 - running annual average) and European commission (5µg/ m3 - annual average). However, the present levels (7-16 µg/ m3) have certainly decreased down than past studies (varied between 42 µg/ m3 to 195 µg/ m3) perhaps due to certain control measures being taken and implemented by the government. The seasonal variations have also been elaborated which indicates the higher values during winter season. The diurnal variation shows that concentration of benzene remains dominant from evening till mid-night mainly in the areas prevalent in vehicular pollution. This indicates that it does not dissipate easily in the environment and therefore, needs serious thoughts for reduction of such pollutants in the urban atmosphere. Various steps and actions for managing benzene pollution in urban atmosphere like Delhi and other metropolitan cities have been discussed which includes vehicular pollution control, fuel quality improvement, alternative fuels, Ambient air quality standards in different countries and proposed air pollution standards. A five-year action plan has also been suggested for nationwide inventorization and assessment of VOCs for formulation of strategies for reduction of emissions BTX and other VOCs.


STATUS AND MANAGEMENT OF BENZENE POLLUTION IN URBAN ATMOSPHERE OF DELHISTATUS AND MANAGEMENT OF BENZENE POLLUTION IN URBAN ATMOSPHERE OF DELHI
[.pdf, 488.9Kb]

Full paper


BAQ 2004 Secretariat at [email protected] Fax: 00 632 636 2381