year,pm25_ug_m3
1990,51.2032665473841
1991,50.1661937890725
1992,50.1221696951975
1993,50.0781456013225
1994,50.0341215074474
1995,48.0040000846993
1996,49.9460733196973
1997,49.9020492258223
1998,49.8580251319472
1999,49.8140010380722
2000,50.7630256086335
2001,50.4537854823933
2002,51.2544544512511
2003,52.5149836233186
2004,50.8446162251344
2005,51.3369278641143
2006,49.2546056005498
2007,49.4513350486064
2008,51.2664820637014
2009,52.2626731220367
2010,51.7188200456979
2011,55.0258281992835
2012,53.0196291324327
2013,52.2693789873114
2014,51.6872206933655
2015,51.4355933740253
2016,54.4218755239322
2017,55.1724251484484
2018,56.6795240921875
2019,53.5981486621548
2020,52.1933674059995
2021,55.6234726382873
2022,50.6577446303517
2023,54.0522242217331
