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Federal Register / Vol. 86, No. 137 / Wednesday, July 21, 2021 / Proposed Rules
first implementation period 2015
2019.58 The five-year average emission reductions achieved since the baseline
from the subject-to-BART controls included 13,195 tons NOX, 41,264 tons
SO2, 1,367 tons PM10, and 356 tons PM2.5 see Table 1.

TABLE 1FIVE YEAR AVERAGE EMISSION REDUCTIONS FROM BART SOURCES FOR 20042008 AND 20152019
Year
NOX

PM10

PM2.5

SO2

20042008 Average
20152019 Average

37,532
24,338

3,782
2,415

2,009
1,652

70,902
29,638

Change

13,195

1,367

356

41,264

In addition to the emission reductions from BART controls, the CSAPR update revised the O3 season NOX budget for Louisiana units to 18,639 tons NOX in 2017 and beyond. The 2019 actual O3
season emission for Louisiana totaled 17,751 tons NOX for 88 different sources.59 The State noted that, along with the replacement of CAIR with CSAPR, there have been many ongoing air pollution programs that supplement the regional haze program since submittal of Louisianas Regional Haze SIP in 2008. These programs include adoption of a SMP that was effective July 1, 2012, NSPS and NESHAP
permitting, PSD regulatory requirements, the National Petroleum Refinery Initiative, mobile emissions regulations, and the National Petroleum Refinery Initiative. Louisiana noted that these additional federal air pollution programs are anticipated to result in even greater emission reductions that could result in further visibility improvement than the programs in
place when the 2008 Louisiana Regional Haze SIP revision was submitted to the EPA.
The EPA proposes to conclude that the State has adequately addressed the applicable provisions under 40 CFR
51.308g regarding a summary of emission reductions achieved for visibility impairing pollutants. Overall, the State demonstrated the emission reductions achieved for the major contributing visibility impairing pollutants in the State for the first implementation period. Emissions of SO2, NOX, and PM, the top three main contributors to regional haze in Louisiana, have all decreased from the 2002 baseline levels through 2019.
Overall visibility conditions have improved as a result of these reductions together with decreases from outside of the state.
D. Visibility Conditions and Changes Louisiana included in its progress report the annual average visibility from
2001 to 2018 for the twenty percent best least impaired and twenty percent worst most impaired days at Breton National Wilderness Refuge.60 Although visibility conditions have varied from year-to-year, the progress report showed that Breton has displayed an overall improvement in visibility since 2001.61
LDEQ reported that Breton showed improved visibility from the 2000 to 2004 baseline 62 during the worst days for the most current period 2014 to 2018.63 Breton area also showed improvement from the baseline on the twenty percent best days and satisfied the goal of no visibility degradation for the first implementation period. The progress report showed that the visibility at Breton during the 2014
2018 period was 5.02 dv below the 20002004 baseline for the twenty percent worst days and 1.31 dv below the baseline for the twenty percent best days as reflected in Tables 2 and 3
below.

TABLE 2VISIBILITY AT BRETON NATIONAL WILDERNESS FOR TWENTY PERCENT BEST DAYS
Five-year avg.

Class I area
Baseline 20002004
dv
Most recent 20142018
dv
Most recent minus baseline dv
Breton National Wilderness Refuge

13.12

11.81

1.31

A negative sign indicates a reduction from the baseline.

58 See
Table 8 of the progress report page 26.
U.S. EPA Clean Air Market Division www.epa.gov/airmarkt/.
60 The most and least impaired days in the regional haze rule refers to the average visibility impairment measured in dv for the twenty percent of monitored days in a calendar year with the highest and lowest amount of visibility impairment, respectively, averaged over a five-year period see 40 CFR 51.301. In this report, when we refer to best days we mean least impaired and when we refer to worst days we mean most impaired.

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59 Source:

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16:23 Jul 20, 2021

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61 See Table 15: Visibility Index at Breton of the progress report pages 31.
62 Note that the period for establishing baseline visibility conditions is 20002004. The Breton IMPROVE monitor did not meet the data capture requirements of the Regional Haze Rule for the 20002004 monitoring period; however, data from a nearby monitoring site, the Gulfport SEARCH site, was used to supplement the Breton monitoring data to establish the baseline.
63 Progress reports for the first implementation period used specific terms to describe time-periods.

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Baseline visibility conditions refers to conditions during the 2000 to 2004 time-period. Current visibility conditions refers to the most recent fiveyear average data available at the time the State submitted its progress report for public review.
Past five years refers to the five-year average previous to the five years used for current visibility conditions.

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