Table 3.

Temporal trends in ozone and emissions (1990 – 2010): percent of model grid cells in a given region with trends significant at the 95% level (see Table 1 for definitions of the emission acronyms).

region:	NE		MA		MW		S		W		NW		WC		SW
emission	+	−	+	−	+	−	+	−	+	−	+	−	+	−	+	−
O3	0	56	0	87	0	35	0	35	4	0	11	3	5	0	2	2
VNR	30	3	71	0	29	19	46	3	22	4	40	0	23	2	53	2
VNE	5	83	2	86	6	84	7	79	24	55	19	50	10	73	20	69
VEG	18	40	40	2	26	14	46	9	27	25	67	22	39	7	47	13
VAR	0	97	0	96	3	95	0	83	2	24	0	38	15	27	10	33
VMO	0	100	0	100	0	100	0	100	0	100	0	100	0	100	0	98
VBI	1	0	0	0	17	0	1	0	76	0	0	3	47	0	19	0
NNR	0	84	0	89	1	91	0	91	2	88	0	91	2	86	2	88
NNE	8	67	9	60	13	52	12	65	36	34	15	40	5	53	25	58
NEG	7	73	12	47	14	49	16	40	19	35	25	25	0	67	15	44
NAR	26	50	33	42	48	26	45	24	39	1	20	11	39	15	57	1
NMO	0	100	0	99	0	100		96	0	100	0	100	0	99	3	97
NBI	2	0	0	11	5	2	4	3	45	1	0	3	38	0	19	0

+ uptrend, − downtrend

Blue: downtrends > 24%; red: uptrends > 24%