Table 1.

Air pollutant data at Jefferson Street and Yorkville, 1999–2004.

Pollutant	Jefferson St., Atlanta (urban)		Yorkville, GA (rural)		Pearson R2 (urban-rural)
	median	25–75% quartile range	median	25–75% quartile range
1-hr max NO2 (ppb)	42	31 – 52	8.2	5.0 – 14.3	0.025
1-hr max NOx (ppb)	86	49 – 166	8.9	5.3 – 15.5	0.050
1-hr max CO (ppb)	816	486 – 1,490	233	191 – 295	0.032
8-hr max O3 (ppb)	40	25 – 57	47	35 – 62	0.786
1-hr max SO2 (ppb)	12	6 – 24	6	4 – 11	0.009
avg PM10 (μg/m3)	25	19 – 34	19	13 – 28	0.600
avg PM2.5 (μg/m3)	16	11 – 21	12	8 – 17	0.725
avg PM2.5 ECa (μg/m3)	1.3	0.8 – 1.9	0.6	0.4 – 0.9	0.189
avg PM2.5 OCa (μg/m3)	3.8	2.7 – 5.3	2.7	1.9 – 4.0	0.350
avg PM2.5 NO3− (μg/m3)	0.7	0.4 – 1.3	0.6	0.4 – 1.1	0.634
avg PM2.5 SO42− (μg/m3)	3.9	2.4 – 6.1	3.7	2.2 – 6.4	0.844

^aTOR method