Table 1.

Descriptive statistics of the distribution of the socioeconomic variables and NO₂ concentrations according to periods and MAs, Mean and standard deviation for all MA

	LILLE (504 census blocks)			LYON (511 census blocks)			MARSEILLE (628 census blocks)			PARIS (2749 census blocks)
	2002–2005	2006–2009	p†	2002–2005	2006–2009	p	2002–2005	2006–2009	p	2002–2005	2006–2009	p
NO2 concentrations (µg/m3)	33.7±6.04	30.5±4.6	***	43.6±5.4	38.6±6.3	***	33.0±10.2	31.9±9.8	0.27	47.4±9.3	44.2±9.9	***
% unemployment	16,2±9,6	14,7± 9,1	***	12,7±6,6	11,6±6,4	***	21.6±11.7	16.2±9.8	***	12.7±5.8	11.9±5.5	***
% single parent	15,3± 7.1	10,8± 5,5	***	14,2±6	9,2±4,5	***	18.7±8.4	12.1±5.8	***	16.2±6	9.9±5	***
% insecure job	12.1±4,2	27.2±7,6	***	11,6±3,6	27,4±7,9	***	10.6±3.2	25.2±6.9	***	10.7±3.2	22.7±5.5	***
% white collar	13.2±11.1	11,4± 8,4	**	15.4 ±10.7	14±9	**	12.6±10.6	10.6±7.4	***	22.7±14.8	21.8±13.3	***
% highereducation	8.1±3.5	9.9± 3.7	**	9.3±3.6	11± 3.9	**	7.8± 3.5	9.5±4.3	**	9.4± 2.9	10± 3.4	*
% non-owner	48,7±25,9	47,9±26,4	*	56,4±21,8	53,7±22,8	***	53.3±22.2	52.7±23.8	0.90	64±20.5	61±22	***
% subsidized house	21,5±26,8	23.4±24.5	***	24,4±29,8	21,2± 25	***	19.3±28.1	17.5±25.3	*	29.2±32.5	24.8±28.3	***
% immigrants	4,8±4.5	8.2 ±6,3	***	7,7±6,6	13,3± 8,9	***	5.4±5.7	11.0±8.7	***	12.3±6.8	20.3±9.1	***
Medianincome (euro)	21952±7130	16339±5411	***	23751±6558	18691±5194	***	21534±7383	16302±5672	***	27636±7823	21638±8343	***

^†p values for Student Paired test between periodsfor each MA.

p<0.05,

^**p<0.01,

^***p<0.001