Low NOx Burners(LNB)

and

Separated Overfire

Air(SOFA)

Old Dirty Plants(uncontrolled)

Cleaner Retrofitted

Plants

New Power Plants

Emissions

Age of Plant

2008 NOx Rates With NGS LNB Performance

Rank PlantStat

eNOx

(lb/MMBtu)Ran

kPlant State

NOx (lb/MMBtu)

1 Riverside MN 0.99 1 Riverside MN 0.992 Bay Front WI 0.94 2 Bay Front WI 0.943 Lakeside IL 0.91 3 Lakeside IL 0.914 Sheldon NE 0.90 4 Sheldon NE 0.905 Chamois MO 0.87 5 Chamois MO 0.876 Niles OH 0.83 6 Niles OH 0.837 Coyote ND 0.77 7 Coyote ND 0.778 Alma WI 0.76 8 Alma WI 0.769 Streeter IA 0.74 9 Streeter IA 0.74

10 Dubuque IA 0.73 10 Dubuque IA 0.73... ... ... ... ... ... ... ...

156 Navajo AZ 0.35 ... ... ... ...... ... ... ...... ... ... ...

321 Navajo AZ 0.20

EPA Health Standard

In 2010 – EPA introduced a new short term, hourly NO2 standard of 100 ppb (3 year average of 98% percentile).

In 2010 - Page measured 28 ppb in regard to the new hourly standard

24 hour PM 2.5 Concentration Air Quality Index

0.0 ug/m3 to 15.4 ug/m3 Good (Green)

15.4 ug/m3 to 35.0 ug/m3 Moderate (Yellow)

35.1 ug/m3 to 65.4 ug/m3 Unhealthy for Sensitive Groups (Orange)

65.5 ug/m3 to 150.4 ug/m3 Unhealthy (Red)

150.5 ug/m3 to 250.4 ug/m3 Very Unhealthy (Purple)

Greater than or equal to 250.5 ug/m3

Hazardous (Maroon)

EPA Air Quality Index, adjusted by the American Lung Association

Page - 2.6 ug/m3 annual average

Fourth Highest Daily Maximum 8-Hour Average Ozone Concentrations (ppb)in various National Parks for 2006–2008