> rn/v	2012 vs 2013 Comparisons, Quarter 1 (January 1 - March 31)
S02 Emission Rate Changes at Facilities (Coal Units Only)
United States
Environmental Protection
Agency	With 2,500 Tons Change in the Quarter Between Years
Source: 2012 data are final, 2013 are
preliminary data submitted to EPA from
sources as of February 24,2014. EPA will
update maps as it corrects data over time.
Note: This map displays changes occurring between the first quarter of 2012 and the first quarter of 2013; many facilities already have advanced
controls and low emission rates and therefore show no change. If a unit has not yet reported first quarter 2013 emissions data to EPA, it is not included
in this map. In areas with a dense concentration of facilities, the facilities on the map may overlap and some may be impossible to see.
S02 Rate Change (%)
•	<25%
•	25% to 50%
•	Over 50%
Decrease
Increase
Not Large Change

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> ppA	2012 vs 2013 Comparisons, Quarter 2 (April 1 - June 30)
S02 Emission Rate Changes at Facilities (Coal Units Only)
United States
Environmental Protection
Agency	With 2,500 Tons Change in the Quarter Between Years
Source: 2012 data are final, 2013 are
preliminary data submitted to EPA from
sources as of February 24,2014. EPA will
update maps as it corrects data over time.
Note: This map displays changes occurring between the second quarter of 2012 and the second quarter of 2013; many facilities already have advanced
controls and low emission rates and therefore show no change. If a unit has not yet reported second quarter 2013 emissions data to EPA, it is not
included in this map. In areas with a dense concentration of facilities, the facilities on the map may overlap and some maybe impossible to see.
Decrease
Increase
Not Large Change
S02 Rate Change (%)
•	<25%
•	25% to 50%
•	Over 50%

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k pp/V	2012 vs 2013 Comparisons, Quarter 3 (July 1 - September 30)
S02 Emission Rate Changes at Facilities (Coal Units Only)
United States
Environmental Protection
Agency	With 2,500 Tons Change in the Quarter Between Years
Source: 2012 data are final, 2013 are
preliminary data submitted to EPA from
sources as of February 24,2014. EPA will
update maps as it corrects data over time.
Note: This map displays changes occurring between the third quarter of 2012 and the third quarter of 2013; many facilities already have advanced
controls and low emission rates and therefore show no change. If a unit has not yet reported third quarter 2013 emissions data to EPA, it is not
included in this map. In areas with a dense concentration of facilities, the facilities on the map may overlap and some maybe impossible to see.
Decrease
Increase
Not Large Change
S02 Rate Change (%)
•	<25%
•	25% to 50%
•	Over 50%

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k rn/v	2012 vs 2013 Comparisons, Quarter 4 (September 1 - December 31)
S02 Emission Rate Changes at Facilities (Coal Units Only)
United States
Environmental Protection
Agency	With 2,500 Tons Change in the Quarter Between Years
Note: This map displays changes occurring between the fourth quarter of 2012 and the third quarter of 2013; many facilities already have advanced
controls and low emission rates and therefore show no change. If a unit has not yet reported fourth quarter 2013 emissions data to EPA, it is not
included in this map. In areas with a dense concentration of facilities, the facilities on the map may overlap and some maybe impossible to see.
S02 Rate Change (%)
•	<25%
•	25% to 50%
•	Over 50%
Decrease
Increase
Not Large Change
Source: 2012 data are final, 2013 are
preliminary data submitted to EPA from
sources as of February 24,2014. EPA will
update maps as it corrects data over time.

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k rnyy	2012 vs 2013 Comparisons, Quarter 1 (January 1 - March 31)
NOx Emission Rate Changes at Facilities (Coal Units Only)
United States
Environmental Protection
Agency	With 1,000 Tons Change in the Quarter Between Years
Source: 2012 data are final, 2013 are
preliminary data submitted to EPA from
sources as of February 24,2014. EPA will
update maps as it corrects data over time.
Note: This map displays changes occurring between the first quarter of 2012 and the first quarter of 2013; many facilities already have advanced
controls and low emission rates and therefore show no change. If a unit has not yet reported first quarter 2013 emissions data to EPA, it is not included
in this map. In areas with a dense concentration of facilities, the facilities on the map may overlap and some may be impossible to see.
Decrease
Increase
Not Large Change
NOx Rate Change (%)
. <25%
•	25% to 50%
•	Over 50%

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> ppA	2012 vs 2013 Comparisons, Quarter 2 (April 1 - June 30)
NOx Emission Rate Changes at Facilities (Coal Units Only)
United States
Environmental Protection
Agency	With 1,000 Tons Change in the Quarter Between Years
Note: This map displays changes occurring between the second quarter of 2012 and the second quarter of 2013; many facilities already have advanced
controls and low emission rates and therefore show no change. If a unit has not yet reported second quarter 2013 emissions data to EPA, it is not
included in this map. In areas with a dense concentration of facilities, the facilities on the map may overlap and some maybe impossible to see.
NOx Rate Change (%)
•	<25%
•	25% to 50%
•	Over 50%
Decrease
Increase
Not Large Change
Source: 2012 data are final, 2013 are
preliminary data submitted to EPA from
sources as of February 24,2014. EPA will
update maps as it corrects data over time.

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k rn/y	2012 vs 2013 Comparisons, Quarter 3 (July 1 - September 30)
NOx Emission Rate Changes at Facilities (Coal Units Only)
United States
Environmental Protection
Agency	With 1,000 Tons Change in the Quarter Between Years
Source: 2012 data are final, 2013 are
preliminary data submitted to EPA from
sources as of February 24,2014. EPA will
update maps as it corrects data over time.
Note: This map displays changes occurring between the third quarter of 2012 and the third quarter of 2013; many facilities already have advanced
controls and low emission rates and therefore show no change. If a unit has not yet reported third quarter 2013 emissions data to EPA, it is not
included in this map. In areas with a dense concentration of facilities, the facilities on the map may overlap and some may be impossible to see.
Decrease
Increase
Not Large Change
NOx Rate Change (%)
. <25%
•	25% to 50%
•	Over 50%

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k rn/v	2012 vs 2013 Comparisons, Quarter 4 (September 1 - December 31)
NOx Emission Rate Changes at Facilities (Coal Units Only)
United States
Environmental Protection
Agency	With 1,000 Tons Change in the Quarter Between Years
Note: This map displays changes occurring between the fourth quarter of 2012 and the third quarter of 2013; many facilities already have advanced
controls and low emission rates and therefore show no change. If a unit has not yet reported fourth quarter 2013 emissions data to EPA, it is not
included in this map. In areas with a dense concentration of facilities, the facilities on the map may overlap and some maybe impossible to see.
NOx Rate Change (%)
•	<25%
•	25% to 50%
•	Over 50%
Decrease
Increase
Not Large Change
Source: 2012 data are final, 2013 are
preliminary data submitted to EPA from
sources as of February 24,2014. EPA will
update maps as it corrects data over time.

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