National Trends in PM10 Concentrations in 1990 - 2018

Year	Mean	Number of Trend Sites	10th Percentile	90th Percentile
1990	85.9504132231405	121	45	144
1991	87.099173553719	121	45	134
1992	74.5867768595041	121	41	113
1993	74.1570247933884	121	41	113
1994	71.8774104683195	121	39	120
1995	73.1143250688705	121	38	126
1996	64.900826446281	121	35	105
1997	65.6198347107438	121	38	111
1998	61.8457300275482	121	38	100
1999	68.6749311294766	121	37	113
2000	65.5123966942148	121	36	102
2001	63.7520661157024	121	38	97
2002	63.2520661157024	121	37	95
2003	64.6446280991735	121	31	116
2004	56.5206611570248	121	30	86
2005	58.595041322314	121	33	92
2006	59.0743801652892	121	34	93
2007	63.0055096418732	121	35	94
2008	57.060606060606	121	32	90
2009	51.6528925619834	121	28	82
2010	51.495867768595	121	29	77
2011	56.2231404958677	121	28	87
2012	55.3057851239669	121	28	91
2013	59.8760330578512	121	25	111
2014	57.5867768595041	121	27	102
2015	53.6611570247934	121	29	78
2016	52.0495867768595	121	25	88
2017	57.3884297520661	121	25	95
2018	63.99173553719	121	27	119