National Trends in Nitrogen_Dioxide Concentrations in 2000 - 2010
Year Mean Number of Trend Sites 10th Percentile 90th Percentile
2000 15.5868182219515 283 5.39492753623188 26.2260631979092
2001 15.3977085672385 283 5.13951059385258 25.6422535211268
2002 14.9198780013627 283 4.98488803407061 24.7255285347672
2003 14.4816474624531 283 4.88644948064212 24.9566812640549
2004 13.5293893806845 283 4.65006026516673 22.7297778833591
2005 13.404004216051 283 4.60507652108996 22.2511610853092
2006 12.7097875645268 283 4.34262101534829 20.8114783872139
2007 12.3010811155452 283 4.04166179052077 20.4246643460965
2008 11.4208870400528 283 3.77512301804265 19.2835422469824
2009 10.5451483352903 283 3.41414674819344 18.2522440805749
2010 10.237567711412 283 3.41078090827222 17.5493135435993