Households for questionnaire survey

(n = 413)

Households for IAP monitoring

(n = 8)

House area (m2)a

<60

14.6

12.5

60 - 79

33.0

25.0

80 - 99

22.3

25.0

100~

30.1

37.5

Biomass use

100.0

100.0

Stoves without smoke door b

88.1

75.0

Chimney lower than eave c

77.9

87.5