Table 2.

Spatial and temporal variability of annual ${\mathrm{NO}}_2$ levels (in ppb) in years 2000–2016.

Categories	Min	Percentile					Max	Mean
		5th	25th	50th	75th	95th
Overall	0.58	5.25	8.36	12.09	17.68	27.10	56.95	13.65
By year
2000	3.32	8.26	14.11	20.17	25.62	34.34	52.47	20.30
2001	4.06	7.51	11.65	17.39	23.74	33.56	49.62	18.45
2002	2.82	6.19	9.91	15.45	21.60	30.69	42.82	16.37
2003	2.71	5.28	8.97	14.06	20.60	29.67	52.11	15.32
2004	2.07	7.19	10.23	14.45	19.49	27.79	46.07	15.48
2005	3.33	6.07	9.04	13.49	19.50	27.43	44.91	14.72
2006	2.11	5.44	7.90	12.13	19.28	26.50	41.54	13.97
2007	1.93	4.70	6.57	9.97	17.11	27.09	42.75	12.41
2008	2.42	6.12	8.00	11.18	16.63	25.13	35.97	12.87
2009	0.93	4.74	6.33	9.30	14.56	21.00	30.62	10.78
2010	0.58	5.23	8.03	10.92	15.18	23.52	36.62	12.14
2011	3.98	7.37	10.25	12.58	15.64	22.95	41.41	13.49
2012	2.94	7.77	10.00	11.85	14.59	21.15	49.47	12.86
2013	2.37	4.67	7.01	9.51	12.82	19.18	56.95	10.44
2014	2.39	4.51	6.62	9.54	14.34	21.12	39.01	10.99
2015	0.97	4.78	7.78	10.48	13.83	20.05	32.08	11.16
2016	1.09	3.84	6.31	9.36	14.03	20.84	31.44	10.59
By state
Alabama	2.21	4.71	6.96	9.77	14.45	21.50	37.55	11.17
Florida	1.98	7.28	11.35	14.87	19.32	25.50	45.19	15.54
Georgia	2.58	5.64	8.56	11.90	19.24	32.37	52.47	14.86
Mississippi	2.24	4.63	6.78	9.52	13.87	20.19	29.85	10.70
North Carolina	0.58	5.58	8.87	12.70	19.01	29.06	46.07	14.54
South Carolina	2.97	5.55	8.23	11.17	16.00	25.38	37.71	12.78
Tennessee	0.94	4.55	6.87	10.08	16.90	27.71	56.95	12.58

Note: ${\mathrm{NO}}_2$, nitrogen dioxide.