Title: Benefits of air quality improvement in Klang Valley Malaysia

Authors: Rafia Afroz, Mohd Nasir Hassan, Muhamad Awang, Noor Akma Ibrahim

Addresses: Faculty of Science and Environmental Studies, Department of Environmental Sciences, University Putra Malaysia, 43400 UPM, Serdang Selangor Darul Ehsan, Malaysia. ' Faculty of Science and Environmental Studies, Department of Environmental Sciences, University Putra Malaysia, 43400 UPM, Serdang Selangor Darul Ehsan, Malaysia. ' Faculty of Science and Environmental Studies, Department of Environmental Sciences, University Putra Malaysia, 43400 UPM, Serdang Selangor Darul Ehsan, Malaysia. ' Institute for Mathematical Research, University Putra Malaysia, 43400 UPM, Serdang Selangor Darul Ehsan, Malaysia

Abstract: The study evaluated the comparative reliability of different question formats of contingent valuation method by resurvey of the same households nine months after their original survey. The test-retest correlations are statistically significant at 1% level. Comparative reliability of different question formats has been tested comparing the test-retest correlations of these methods. This test has revealed that there is no significant difference in the test-retest correlations between the different question formats for either level A (reduction of the concentration of PM₁₀ by 10%) or level B (reduction of the concentration of PM₁₀ by 20%) air quality improvement.

Keywords: willingness to pay; air quality; dichotomous choice; open ended; payment cards; comparative reliability; air pollution; Malaysia.

DOI: 10.1504/IJEP.2007.014507

International Journal of Environment and Pollution, 2007 Vol.30 No.1, pp.119 - 136

Published online: 12 Jul 2007 *

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