Year,PM2.5 air pollution mean annual exposure (micrograms per cubic meter)
1990,64.65
1991,63.87
1992,63.87
1993,63.86
1994,63.86
1995,62.31
1996,63.85
1997,63.84
1998,63.84
1999,63.83
2000,64.6
2001,64.16
2002,65.24
2003,64.44
2004,63.99
2005,65.5
2006,63.13
2007,62.68
2008,65.2
2009,70.65
2010,67.49
2011,69.2
2012,73.03
2013,65.48
2014,68.74
2015,65.52
2016,64.24
2017,63.83
2018,79.3
2019,66.79
2020,72.11
2021,73.11
2022,63.22
2023,69.25