Year	PM2.5	PM10	O3	NO2
2000		51.1	19.3	27.1
2001		35.7	34.2	20.4
2002		40.4	23.2	22.1
2003		48.3	63.8	31.6
2004		32.5	23.1	19
2005		39.7	25.4	20.2
2006	20.9	44.5	53.9	15.6
2007	11.9	34.7	23.5	19.1
2008	10.4	27.9	18.4	11.3
2009	9.3	26.2	17.4	12.6
2010	11	27.1	19.2	10.5
2011	15	32.9	18.4	10.6
2012	12.5	23.8	17.6	7.4
2013	9.3	22.9	18	8.1
2014	8.6	18.7	8.7	5.5
2015	7.1	22.6	36	8.4
2016	5.2	13.4	13.6	6.3
2017	8.1	18.8	18.8	6.7
2018	3	15.7	41.7	3.1
2019	0.5	11.2	24.6	3
2020	0.2	10.8	12.3	0.8