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Table 4 Monthly household income by range and respondent’s contribution (n = 1541)

From: Impact of environmental and social attitudes, and family concerns on willingness to pay for improved air quality: a contingent valuation application in Mexico City

Monthly household Respondent’s contribution to household income
income Less than 50% 50% to 75% more than 75%
Less than US $567 18.36 11.10 12.07
Between US $567 and US $ 967 16.22 5.71 11.49
Between US $967 and US $2167 7.14 6.75 7.85
Between US $2167 and US $5000 0.00 3.31 0.00