Year	SOx	NOx	NH3	NMVOC	Primary PM2.5	SOx change	NOx change	NH3 change	NMVOC change	PM2.5 change
1990	27643	18521	5887	18695		100	100	100	100	100
1991	25443	17983	5618	17817		92.042	97.096	95.439	95.302	101.124
1992	23563	17543	5367	17105		85.24	94.72	91.175	91.497	98.495
1993	22156	16907	5175	16486		80.151	91.287	87.908	88.184	96.678
1994	20637	16193	5049	15296		74.657	87.433	85.766	81.819	93.673
1995	18727	15917	4902	14886		67.747	85.942	83.275	79.624	91.553
1996	17623	15725	4935	14693		63.754	84.903	83.83	78.594	91.66
1997	16727	15188	4922	14292		60.511	82.007	83.605	76.449	88.984
1998	15168	14774	4931	13791		54.873	79.768	83.764	73.768	86.067
1999	13448	14341	4951	13152		48.649	77.434	84.11	70.351	83.894
2000	12507	14030	4845	12475	1617	45.245	75.753	82.307	66.732	81.394
2001	11824	13713	4773	11894	1617	42.776	74.042	81.08	63.623	81.422
2002	11163	13427	4689	11380	1576	40.384	72.496	79.658	60.874	79.332
2003	10672	13361	4722	11028	1571	38.606	72.138	80.219	58.991	79.073
2004	10124	13207	4682	10736	1548	36.624	71.308	79.538	57.428	77.943
2005	9877	12952	4640	10409	1502	35.733	69.93	78.825	55.68	75.596
2006	9871	12685	4674	10130	1456	35.71	68.493	79.408	54.188	73.288
2007	9906	12399	4651	9748	1420	35.837	66.944	79.011	52.141	71.502
2008	8225	11522	4539	9337	1401	29.754	62.212	77.103	49.943	70.54
2009	7512	10605	4509	8783	1349	27.174	57.26	76.589	46.979	67.932
2010	7151	10468	4466	8863	1385	25.871	56.52	75.862	47.41	69.733
2011	7169	10298	4491	8529	1315	25.935	55.604	76.297	45.623	66.186
2012	6818	9904	4510	8331	1294	24.664	53.474	76.614	44.566	65.126
2013	5469	9472	5032	8097	1319	19.784	51.141	85.483	43.31	66.43