Table 6 WTP estimates (2008 US dollars) and 90% empirical confidence intervals^a

Neither problem is very important (N)

Air pollution is very important (A)

Poverty/economic development is very important (P)

Both problems are very important (BP)

Family member suffers respiratory illness or allergy (I)

 (I) + (A)

 (I) + (P)

 (I) + (BP)

More adults than sample median (M)

 (M) + (A)

 (M) + (P)

 (M) + (BP)