Table 4. Coefficients of linear regression of the biological markers for 10 µg/m³ units of increase of PM10, PM2.5 and NO₂ concentration.

	Same day			Weeks preceding biological sampling
				1 week			2 weeks			3 weeks
	PM 10	PM 2.5	NO2	PM 10	PM 2.5	NO2	PM 10	PM 2.5	NO2	PM 10	PM 2.5	NO2
MN	−0.01	−0.00	0.00	0.01*	0.01	0.03**	0.00	0.00	0.02	−0.01	−0.03**	−0.01
Nuclear buds	−0.00	0.00	0.08*	0.01***	0.01**	0.01***	0.00	0.00	0.01**	−0.00	−0.00	0.00
Binucleated cells	−0.00	−0.00	0.01	0.01**	0.01*	0.02**	0.01**	0.02**	0.03***	0.00	0.00	0.03**
Basal cells	0.02	0.00	0.10	0.20***	0.15**	0.40***	0.15**	0.26**	0.42***	0.06	0.03	0.40**
Condensed chromatin cells	0.20	0.06	1.07***	1.13***	1.06***	2.93***	1.26***	1.94***	3.61***	0.74*	0.71	3.79***
Karyorrhetic cells	0.04	−0.36**	−0.26	1.73	−0.29	0.20	0.66***	0.60	1.22**	1.05***	1.32**	2.22***
Pyknotic cells	0.01	0.04**	0.02	0.02	0.03	0.03	−0.03	−0.01	−0.05	−0.07**	−0.11**	−0.12*
Karyolytic cells	−0.04	0.02	−0.25	−0.48***	−0.36**	−0.93***	−0.61***	−0.93***	−1.40***	−0.61**	−0.71*	−2.05***
Without nucleus cells	0.09*	0.07	0.12	−0.01	−0.08	0.05	−0.01	−0.04	0.03	−0.01	−0.12	−0.04

statistically significant: *p<0.05;

**p<0.01;

***p<0.001.