# Appendix C

Historic Air Quality Data

# Historic Air Quality Data i

The Charlotte-Gastonia-Rock Hill, NC-SC 8-hour ozone Appendix C

North Carolina Attainment Demonstration June 15, 2007

# Historic Air Quality Data ii

The Charlotte-Gastonia-Rock Hill, NC-SC 8-hour ozone Appendix C

North Carolina Attainment Demonstration June 15, 2007 

# Table of Contents

Historic Fourth Highest 8-Hour Ozone Values ( ppm) for the Charlotte-Gastonia-Rock Hill,

NC-SC Nonattainment Area ................................................................................................1

Historic 8-Hour Ozone Design Values (ppm) for the Charlotte-Gastonia-Rock Hill, NC-SC

Nonattainment Area............................................................................................................. 2

# Historic Air Quality Data iii

The Charlotte-Gastonia-Rock Hill, NC-SC 8-hour ozone Appendix C

North Carolina Attainment Demonstration June 15, 2007Table 1: Historic Fourth Highest 8-Hour Ozone Values (ppm) for Charlotte-Gastonia-Rock Hill, NC-SC Nonattainment Area8-hour ozone values are listed in parts per million (ppm)Bolded values represent exceedances of the 8-hour ozone National Ambient Air Quality Standards.Underline values represent 4thhighest values from Plaza monitoring site. The Plaza monitor was moved to the Garinger site locationin 2000.Shaded areas reflect no monitoring data available.Monitoring Sites County1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006Crouse Lincoln0.088 0.0900.0840.085 0.090 0.087 0.094 0.094 0.095 0.0890.074 0.082 0.082Arrowood Mecklenburg0.087 0.096 0.099 0.094 0.104 0.104 0.087 0.086 0.0940.073 0.0770.0850.080County Line Mecklenburg0.091 0.091 0.099 0.101 0.110 0.103 0.101 0.099 0.107 0.0880.0830.090 0.093Garinger (Plaza) Mecklenburg0.0890.0900.0980.1050.1000.0990.096 0.099 0.103 0.086 0.085 0.088 0.091Enochville Rowan0.086 0.088 0.092 0.099 0.102 0.094 0.103 0.108 0.0870.0800.088 0.089Rockwell Rowan0.092 0.092 0.100 0.089 0.101 0.107 0.092 0.097 0.106 0.0980.0800.086 0.085Monroe Union0.096 0.0850.0810.1000.083 0.074 0.082 0.080YorkYork Cty, SC0.085 0.0870.079 0.0800.087 0.0920.076 0.0800.0960.076 0.071 0.079 0.078Table 2: Historic 8-Hour Ozone Design Values (ppm) for Charlotte-Gastonia-Rock Hill, NC-SC Nonattainment Area8-hour design values are listed in parts per million (ppm)Bolded values represent violations of the 8-hour ozone National Ambient Air Quality Standards.Underline values represent design values that use 4thhighest values from Plaza monitoring site.Shaded areas reflect data not available to calculate design value.Monitoring Sites County 1994-1996 1995-1997 1996-1998 1997-1999 1998-2000 1999-2001 2000-2002 2001-2003 2002-2004 2003-2005 2004-2006Crouse Lincoln0.087 0.086 0.086 0.087 0.090 0.091 0.094 0.092 0.0860.081 0.079Arrowood Mecklenburg0.094 0.096 0.099 0.100 0.098 0.092 0.0890.084 0.081 0.078 0.080County Line Mecklenburg0.093 0.097 0.103 0.104 0.104 0.101 0.102 0.098 0.092 0.087 0.088Garinger (Plaza) Mecklenburg0.0920.0970.1010.1010.0980.0980.099 0.096 0.091 0.086 0.088Enochville Rowan0.088 0.093 0.097 0.098 0.099 0.101 0.099 0.091 0.085 0.085Rockwell Rowan0.094 0.093 0.096 0.099 0.100 0.098 0.098 0.100 0.094 0.0880.083Monroe Union0.087 0.088 0.088 0.0850.079 0.078YorkYork Cty, SC0.083 0.082 0.0820.086 0.0850.082 0.084 0.084 0.081 0.075 0.076