Better air quality means fewer dangerous days
Number of days per year in New York City with air quality advisories
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
For sensitive groups
For the general population
For sensitive groups
For the general population
