Effects of Population Weighting on PM₁₀ Concentration Estimation

Table 5

Exposure levels of the Malaysia population and area distributions in different PWEL of PM₁₀ concentrations according to the WHO guideline and interim targets for annual mean PM₁₀ concentrations.

Exposure level	PM10 ranges (µg/m³)	2000		2008		2013
		Area ratio (%)	Population ratio (%)	Area ratio (%)	Population ratio (%)	Area ratio (%)	Population ratio (%)
1	PWEL ≤20	0.31	5.05	0.00	0.00	0.00	0.00
2	20 <PWEL ≤30	0.24	1.06	71.41	26.30	0.00	0.00
3	30 <PWEL ≤50	96.97	65.40	28.58	73.38	97.27	68.87
4	50 <PWEL ≤70	2.47	28.41	0.01	0.23	2.71	30.88
5	PWEL >70	0.00	0.00	0.00	0.00	0.01	0.25