Year	SOx	NMVOC	NOx	PM2.5	NH3	Primary PM2.5	SOx change	NMVOC change	NOx change	PM2.5 change	NH3 change
1990	26882	18951	18761		5723		100	100	100		100
1991	24724	18290	18321		5499		91.97232349	96.51205741	97.65470924		96.0859689
1992	22759	17681	17962		5271		84.66259951	93.29850668	95.74116518		92.10204438
1993	21522	17095	17151		5165		80.06100737	90.20632157	91.41836789		90.24986895
1994	20095	15861	16615		5037		74.75262257	83.69479183	88.56137733		88.01327975
1995	18512	15359	16204		4959		68.86392382	81.0458551	86.37066254		86.6503582
1996	17337	15203	16019		5014		64.49296927	80.22267954	85.38457438		87.61139263
1997	16111	14744	15394		4995		59.9322967	77.80064377	82.05319546		87.27939892
1998	14930	14229	15080		5055		55.53902239	75.08310907	80.37951069		88.3278001
1999	13173	13554	14590		5057		49.00305037	71.52129175	77.76770961		88.36274681
2000	12355	12861	14130	1915	4949		45.96012201	67.86449264	75.31581472	100	86.47562467
2001	11658	12302	13876	1848	4861		43.36730898	64.91478022	73.96194233	96.50130548	84.9379696
2002	11030	11835	13537	1751	4802		41.03117328	62.45053032	72.1550024	91.43603133	83.90704176
2003	10546	11415	13385	1787	4820		39.230712	60.23428843	71.34481104	93.31592689	84.22156212
2004	9961	11064	13311	1750	4782		37.05453463	58.38214342	70.95037578	91.38381201	83.5575747
2005	9759	10729	13148	1756	4737		36.30310245	56.61442668	70.08155216	91.69712794	82.77127381
2006	9668	10468	12820	1708	4740		35.96458597	55.23719065	68.3332445	89.19060052	82.82369387
2007	9659	10102	12492	1687	4708		35.93110632	53.30589415	66.58493684	88.09399478	82.26454657
2008	8077	9684	11618	1670	4572		30.04612752	51.10020579	61.92633655	87.20626632	79.88817054
2009	7253	9110	10697	1606	4534		26.9808794	48.07134188	57.01721657	83.86422977	79.22418312
2010	6862	9141	10516	1639	4493		25.52637453	48.23492164	56.05244923	85.58746736	78.50777564
2011	6843	8713	10168	1513	4506		25.45569526	45.97646562	54.19753744	79.0078329	78.73492923
2012	6515	8613	9745	1533	4533		24.23554795	45.44878898	51.94286019	80.05221932	79.20670977
2013	5276	8373	9370	1493	4553		19.62651588	44.18236505	49.94403283	77.96344648	79.55617683
2014	5205	8109	9035	1388	4595		19.36239863	42.78929872	48.15841373	72.48041775	80.29005766
2015	4830	8146	8868	1399	4637		17.96741314	42.98453907	47.26826928	73.05483029	81.02393849
2016	4701	8008	8586	1378	4717		17.48753813	42.25634531	45.76515111	71.95822454	82.42180674