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Federal Register / Vol. 86, No. 137 / Wednesday, July 21, 2021 / Proposed Rules TABLE 3VISIBILITY AT BRETON NATIONAL WILDERNESS FOR TWENTY PERCENT WORST DAYS
Five-year avg.
Class I area
Baseline 20002004
dv
Most recent 20142018
dv
Most recent minus baseline dv
Breton National Wilderness Refuge

25.73

20.71

5.02

A negative sign indicates a reduction from the baseline.

When comparing the 2018 RPG of 22.51 dv with the observed five-year visibility trends, Breton is realizing more visibility improvement than needed to meet the 2018 RPG. The average visibility condition at Breton during the 2014 to 2018 period for the twenty percent worst days was 1.8 dv below the 2018 RPG. Therefore, the EPA
proposes to conclude that the State has adequately addressed the applicable provisions under 40 CFR 51.308g with respect to visibility conditions at Louisianas Class I area.
E. Emission Tracking In its progress report, the State presented National Emission Inventory NEI total combined anthropogenic emissions for the criteria pollutants for 2002, 2008, 2011, 2014, and 2017. The baseline 2000 to 2004 period was represented by the 2002 NEI. The most recent NEI inventory available at the time of development of the progress report to represent current emissions was from the draft 2017 NEI. The overall total combined anthropogenic emissions
of CO, SO2, NH3, PM, NOX, and VOC
were depicted in a stacked bar chart 64
in the progress report and showed a total emission decrease from the 2002
base year period to the most recent 2017
inventory year. The State noted, however, that there was a slight increase in emissions in 2008 in the chart that could be attributed to normal growth that preceded the implementation of controls from the 2008 Regional Haze SIP. A more significant increase in combined anthropogenic emissions occurred in 2011. The State attributed that increase to a change in methodology using the EPA Oil and Gas tool for estimating emissions from oil and gas production facilities. That tool was developed for the 2011 NEI and used for all subsequent NEIs. A
downward trend was shown from 2011
to 2017, which the State made as the focus of the progress report. The State noted that despite the significant increase in 2011, the 2014 and 2017 NEI
total combined anthropogenic emissions reduced to lower than the emissions in 2008 when the original SIP was
submitted. That trend reflects the implementation of controls from the Louisiana Regional Haze SIP. Also, the 2017 NEI emissions were well below the 2002 NEI baseline totals.
In order to further evaluate the effectiveness of the 2018 Regional Haze SIP for the most recent five-year period, LDEQ compared categorized anthropogenic emission inventories for 2011 and 2017.65 The pollutants inventoried included SO2, NOX, NH3, VOC, CO, PM2.5, and PM10. The inventories were categorized for all major visibility-impairing pollutants under major anthropogenic source groupings. The anthropogenic source categorization included point and nonpoint sources, on and non-road mobile sources, and area sources. A reduction in the total emissions for each of the criteria pollutants was observed over the six-year period from 2011 to 2017 as seen in Table 4. The pollutants of concern for haze in Louisiana, SO2, NOX, and PM10 were collectively reduced by nearly 505,305 tons.

TABLE 4COMPARISON OF 2011 TO 2017 ANTHROPOGENIC EMISSIONS
tpy
Inventory year 2011
2017
D 20112017

VOC

NOX

PM2.5

PM10

426,115
260,746

558,235
331,115

125,749
78,455

395,370
252,843

I 165,369 I 227,120 I

47,294

NH3
56,742
45,959

I 145,527 I

10,783

SO2
274,588
141,930

CO
1,195,493
788,471

I 132,658 I 407,022

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Table 11 of the progress report SIP submittal showed incorrect emission reduction totals for 2011 and 2017, but the corrected totals calculated from Tables 9 and 10 are shown in this table.

A similar comparison of the 2017 NEI
emissions and the 2018 projected emissions provides a look at the change in actual emissions to what was originally projected for 2018 for the purpose of Regional Haze SIP
development. As shown in Table 5 of this action, the total NEI actual emissions from all criteria pollutants was less. The NEI actual emission
reductions surpassed the projected emissions for VOC, NOX, PM2.5, SO2, and CO significantly. The total PM10
emissions were not reduced as dramatically as projected, but the State noted that was likely impacted by the increase in oil and gas emissions unaccounted for at the time of the 2008
Regional Haze SIP revisions. The actual 2017 NEI emissions for NOX and SO2

totaled 515,805 tons less than what was projected for 2018. That difference far outweighs the higher actual tons of PM10 emissions than projected for PM10
because sulfate and nitrate particulate from SO2 and NOX emissions make up 83% of the composition of the light extinction contributing to haze at Breton.66

64 See Figure 13: NEI Anthropogenic Emissions Totals page 27 of the progress report.

65 See Tables 9 to 11 page 28 of the progress report.

66 See Table 16: Total Light Extinction and Composition at Breton page 33 of the progress report.

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