Status of Indiana Air Quality Lower Northwest Indiana

Status of Indiana Air Quality Lower Northwest Indiana Region 1

Ozone Concentration (ppm) 1 -Hour Ozone 4 th High Values Lower Northwest Indiana 0. 130 0. 120 0. 110 0. 100 0. 090 0. 080 0. 070 1 -Hour Ozone 4 th High Values * 1 -Hour Ozone Standard Revoked in 2005. 1 -Hour Ozone Standard (0. 12 ppm) 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 0. 060 Trendline 2

Ozone * 8 -Hour Ozone Standard Established in 1997. 3

Changing Particulate Standards Name Total Suspended Particle (TSP) Dates 1970 -1987 1983 -Present 1999 -Present 30 µm 10 µm 2. 5 µm 24 -Hour Standard 260 150 65 (1999 -2005) 35 (2006 -Present) Annual Standard 75 50 15 Regulated Size *µm = micrograms PM 10 PM 2. 5 4

Particulate Matter *Annual TSP Standard Revoked in 1987. 5

Particulate Matter 24 -Hour TSP 2 nd High Values Lower Northwest Indiana 250 200 150 100 50 24 -Hour 2 nd High Values *24 -Hour TSP Standard Revoked in 1987. 24 -Hour TSP Standard (260 µg/m³) 1988 1987 1986 1985 1984 1983 1982 1981 0 1980 Concentration (µg/m³) 300 Trendline 6

Particulate Matter Annual Arithmetic Mean PM 2. 5 Values Lower Northwest Indiana 15 10 5 Annual Arithmetic Means Annual PM₂. ₅ Standard (15 µg/m³) 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 0 2000 Concentration (µg/m 3) 20 Trendline 7

Particulate Matter 24 -Hour PM 2. 5 98 th Percentile Values Lower Northwest Indiana 60 50 40 30 20 10 24 -Hour 98 th Percentile Values 2006 24 -Hour PM₂. ₅ Standard (35 µg/m³) 1997 24 -Hour PM₂. ₅ Standard (65 µg/m³) Trendline 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 0 2000 Concentration (µg/m³) 70 8

Sulfur Dioxide 0. 035 Annual Arithmetic Mean SO 2 Values Lower Northwest Indiana Concentration (ppm) 0. 030 0. 025 0. 020 0. 015 0. 010 0. 005 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 0. 000 Annual Arithmetic Means *Annual SO 2 Standard Revoked in 2010. Annual SO₂ Standard (0. 03 ppm) Trendline 9

Sulfur Dioxide *24 -Hour SO 2 Standard Revoked in 2010. 10

Sulfur Dioxide Highest 1 -Hour SO 2 99 th Percentile Values Lower Northwest Indiana Concentration (ppb) 350 300 250 200 150 100 50 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 0 1 -Hour 99 th Percentil Values *1 -Hour SO 2 Standard Established in 2010. 1 -Hour SO₂ Standard (75 ppb) Trendline 11

Air Quality and You • To learn more about your air quality and what you can do to help, visit: Smogwatch. IN. gov • To acquire additional information about air quality in Indiana and IDEM’s role, visit: www. idem. IN. gov 12

Contact Information for IDEM’s Office of Air Quality • To call please dial: (317) 233 -0178 • To write, please use this mailing address: IDEM, Office of Air Quality 100 North Senate Avenue Indianapolis, IN 46204 13