Table 2 Distribution of daily levels (24 h average) of PM pollution indicators (μg/m³), percentage of missing data and correlation between PM_2.5 and PM_2.5−10 indicators in 6 French cities, 2000–2003

	% Of missing data over the study period (%)	Distribution of the PM_2.5indicator			Distribution of the PM_2.5−10indicator			Correlation between PM_2.5and PM_2.5−10 indicators
	% Of missing data over the study period (%)	P5*	P95*	Mean	P5*	P95*	Mean	Correlation between PM_2.5and PM_2.5−10 indicators
Le Havre	3.7	6.0	30.5	13.8	2.5	14.0	7.3	0.59
Lille	2.5	6.9	26.3	15.9	2.2	13.7	7.9	0.73
Marseille	1.1	8.0	33.0	18.8	4.5	21.0	11.0	0.28
Paris	5.9	6.5	28.8	14.7	3.2	15.9	8.3	0.48
Rouen	7.6	7.5	28.0	14.4	3.0	12.5	7.0	0.69
Toulouse	3.7	6.0	25.0	13.8	3.0	15.0	7.7	0.46

*P5 and P95: 5th and 95th percentiles.
In most cities, two measurements were used. However, in Toulouse only one measurement was available; in Paris, four stations were used and the coefficient presented is that between the two most distant stations.