PLEASE NOTE: The Regional Administrator, Jared Blumenfeld, signed the following proposed rule on September 17, 2014. EPA is 

submitting it for publication in the Federal Register (FR). While we have taken steps to ensure the accuracy of this internet version of the 

rule, it is not the official version of the rule for purposes of compliance. Please refer to the official version in a forthcoming FR 

publication, which will appear on the Government Printing Office's FDsys website (http://fdsys.gpo.gov/fdsys/search/home.action) and 

on Regulations.gov (http://www.regulations.gov) in Docket No. EPA-R09-OAR-2014-0586. 

ENVIRONMENTAL PROTECTION AGENCY 

40 CFR Part 52 

[EPA-R09-OAR-2014-0586; FRL-] 

Approval and Promulgation of State Implementation Plans; California; Regional Haze 

Progress Report

AGENCY: Environmental Protection Agency (EPA). 

ACTION: Proposed rule. 

SUMMARY: The Environmental Protection Agency (EPA) is proposing to approve a revision 

to the California Regional Haze (RH) State Implementation Plan (SIP) submitted by the 

California Air Resources Board (CARB) documenting that the State’s existing plan is making 

adequate progress to achieve visibility goals by 2018. The California RH SIP revision addresses 

the Regional Haze Rule (RHR) requirements under the Clean Air Act (CAA) to submit a report 

describing progress in achieving reasonable progress goals (RPGs) to improve visibility in 

Federally designated Class I areas in California and in nearby states that may be affected by 

emissions from sources in California. EPA is proposing to approve California’s determination 

that the existing RH SIP is adequate to meet the visibility goals, and requires no substantive 

revision at this time. 

DATE: Comments must be received by the designated contact at the address listed below on or 

before [insert date 30 days after date of publication in the Federal Register]. 
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steps to ensure the accuracy of this version, but it is not the official version. 

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ADDRESSES: Submit your comments, identified by Docket ID No. EPA-R09-OAR-2014-

0586, by one of the following methods: 

• Federal Rulemaking portal: http://www.regulations.gov. Follow the on-line instructions 

for submitting comments. 

• E-mail: webb.thomas@epa.gov. 

• Fax: 415-947-3579 (Attention: Thomas Webb). 

• Mail, Hand Delivery, or Courier: Thomas Webb, EPA Region 9, Air Division (AIR-2), 

75 Hawthorne Street, San Francisco, California 94105. Hand and courier deliveries are 

only accepted Monday through Friday, 8:30 a.m. to 4:30 p.m., excluding Federal 

holidays. Special arrangements should be made for deliveries of boxed information. 

Instructions: EPA's policy is to include all comments received in the public docket 

without change. We may make comments available online at http://www.regulations.gov, 

including any personal information provided, unless the comment includes information claimed 

to be confidential business information (CBI) or other information for which disclosure is 

restricted by statute. Do not submit information that you consider to be CBI or that is otherwise 

protected through http://www.regulations.gov or e-mail. The http://www.regulations.gov web 

site is an “anonymous access” system, which means EPA will not know your identity or contact 

information unless you provide it in the body of your comment. If you send an e-mail comment 

directly to EPA, without going through http://www.regulations.gov, we will include your e-mail 

address as part of the comment that is placed in the public docket and made available on the 

Internet. If you submit an electronic comment, EPA recommends that you include your name and 

other contact information in the body of your comment and with any disk or CD-ROM you 

submit. If EPA cannot read your comment due to technical difficulties and cannot contact you 
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for clarification, EPA may not be able to consider your comment. Electronic files should not 

include special characters or any form of encryption, and be free of any defects or viruses. 

Docket: All documents for this proposed action are listed in the index for docket number 

EPA-R09-OAR-2014-0586 on http://www.regulations.gov. Although listed in the index, some 

information is not publicly available, such as CBI or other information that is restricted by 

statute. Certain other material, such as copyrighted material, is publicly available only in hard 

copy form. Publicly available docket materials are available electronically at 

http://www.regulations.gov or in hard copy during normal business hours at the Planning Office 

of the Air Division, AIR-2, EPA Region 9, 75 Hawthorne Street, San Francisco, CA 94105. To 

view hard copies of documents listed in the docket index, EPA requests that you contact the 

individual listed in the FOR FURTHER INFORMATION CONTACT section. 

FOR FURTHER INFORMATION CONTACT: Thomas Webb, U.S. EPA, Region 9, 

Planning Office, Air Division, AIR-2, 75 Hawthorne Street, San Francisco, CA 94105. Thomas 

Webb may be reached at telephone number (415) 947-4139 and via electronic mail at 

webb.thomas@epa.gov. 

SUPPLEMENTARY INFORMATION: 

Table of Contents 

I. Overview of Proposed Action 

II. Background on Regional Haze 

III. Background on Regional Haze Plans 

IV. Requirements for Regional Haze Progress Reports 

V. EPA’s Evaluation of California’s Progress Report 

A. Status of Control Strategies 
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B. Emission Reductions and Progress 

C. Visibility Progress 

D. Assessment of Changes Impeding Visibility Progress 

E. Assessment of Current Strategy 

F. Review of Visibility Monitoring Strategy 

G. Determination of Adequacy 

H. Consultation with Federal Land Managers 

VI. EPA’s Proposed Action 

VII. Statutory and Executive Order Reviews 

I. Overview of Proposed Action 

EPA is proposing to approve CARB’s determination that the existing California RH SIP 

is adequate to achieve the established RPGs for Class I areas by 2018, and therefore requires no 

substantive revision at this time. The State’s determination and EPA’s proposed approval are 

based on the California Regional Haze Plan 2014 Progress Report (“Progress Report” or 

“Report”) submitted by CARB to EPA on June 16, 2014, that addresses 40 CFR 51.308(g) and 

(h) of the RHR. The Progress Report demonstrates that the emission control measures in the 

existing RH SIP are sufficient to enable California, as well as other states with Class I areas 

affected by emissions from sources in California, to meet all established RPGs for 2018. We are 

also proposing to find that CARB fulfilled the requirements in 51.308(i)(2), (3), and (4) to 

provide Federal Land Managers (FLMs) with an opportunity to consult on the RH SIP revision, 

describe how CARB addressed the FLMs’ comments, and provide procedures for continuing the 

consultation. 

II. Background on Regional Haze
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Regional haze is visibility impairment produced by many sources and activities located 

across a broad geographic area that emit fine particles that impair visibility by scattering and 

absorbing light, thereby reducing the clarity, color, and visible distance that one can see. These 

fine particles also can cause serious health effects and mortality in humans and contribute to 

environmental impacts, such as acid deposition and eutrophication of water bodies. 

The RHR uses the deciview as the principle metric for measuring visibility and for the 

RPGs that serve as interim visibility goals toward meeting the national visibility goal of reaching 

natural conditions by 2064. A deciview expresses uniform changes in haziness in terms of 

common increments across the entire range of visibility conditions, from pristine to extremely 

hazy conditions. Deciviews are determined by using air quality measurement to estimate light 

extinction, and then transforming the value of light extinction using a logarithmic function. 

Deciview is a more useful measure for tracking progress in improving visibility than light 

extinction because each deciview change is an equal incremental change in visibility perceived 

by the human eye. Most people can detect a change in visibility at one deciview. 

III. Background on Regional Haze Plans 

In section 169A(a)(1) of the CAA Amendments of 1977, Congress created a program to 

protect visibility in designated national parks and wilderness areas, establishing as a national 

goal the “prevention of any future, and the remedying of any existing, impairment of visibility in 

mandatory Class I Federal areas which impairment results from manmade air pollution.” In 

accordance with section 169A of the CAA and after consulting with the Department of Interior, 

EPA promulgated a list of 156 mandatory Class I Federal areas where visibility is identified as 

an important value (44 FR 69122, November 30, 1979). In this notice, we refer to mandatory 

Class I Federal areas as “Class I areas.” California has 29 Class I areas, the most of any state. 
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With the CAA Amendments of 1990, Congress added section 169B to address regional 

haze issues. EPA promulgated a rule to address regional haze on July 1, 1999, known as the 

Regional Haze Rule (64 FR 35713). The RHR revised the existing visibility regulations in 40 

CFR 51.308 to integrate provisions addressing regional haze impairment and to establish a 

comprehensive visibility protection program for Class I areas. 

CARB submitted its initial RH SIP to EPA on March 17, 2009, in accordance with the 

requirements of 40 CFR 51.308 for the first regional haze planning period ending in 2018. EPA 

approved the California RH SIP for the first planning period on June 14, 2011 (76 FR 34608). 

The Progress Report from CARB is the first evaluation of whether the existing California RH 

SIP is sufficient to enable California, and other states affected by emissions from sources in 

California, to meet the established visibility goals for 2018. 

IV. Requirements for Regional Haze Progress Reports 

The RHR in 40 CFR 51.308(g) requires states to submit a report every five years in the 

form of a SIP revision to evaluate progress toward achieving the RPGs for each Class I area in 

the state and for those areas outside the state that may be affected by emissions from within the 

state. The first progress reports are due five years from the submittal date of each state’s initial 

RH SIP. These reports must contain an evaluation of seven elements, at a minimum, and include 

a determination of the adequacy of the state’s existing RH SIP. In summary,1the seven elements 

are: 1) a description of the status of implementation of all measures included in the current RH 

SIP for achieving the RPGs in Class I areas within and outside the State; 2) a summary of the 

emission reductions achieved in the State through implementation of these measures; 3) an 

assessment of visibility conditions and changes on the most impaired and least impaired days for 

 

1 Please refer to 40 CFR 51.308(g) for the exact Rule requirements.
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steps to ensure the accuracy of this version, but it is not the official version. 

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each Class I area in the State in terms of 5-year averages of the annual values; 4) an analysis of 

changes in emissions over the past 5 years contributing to visibility impairment from all sources 

and activities within the State based on the most recently updated emissions inventory; 5) an 

assessment of any significant changes in anthropogenic emissions within or outside the State 

over the past 5 years that have limited or impeded progress in reducing pollutant emissions and 

improving visibility; 6) an assessment of whether the elements and strategies in the current RH 

SIP are sufficient to enable the State, or other states affected by its emissions, to achieve the 

established RPGs; and 7) a review of the State’s visibility monitoring strategy and any necessary 

modifications. 

Based on an evaluation of the factors listed above as well as any other relevant 

information, a state is required in 40 CFR 51.308(h) to determine the adequacy of its existing RH 

SIP. The state must take one of four possible actions based on the analysis in its progress report. 

In summary,2these actions are to 1) provide a negative declaration to EPA that no further 

substantive revisions to the State’s existing RH SIP is needed to achieve the RPGs; 2) provide 

notification to EPA and to other states in its region that its RH SIP is or may be inadequate to 

ensure reasonable progress due to emissions from sources in other states, and collaborate with 

other states to develop additional strategies to address the deficiencies; 3) provide notification 

and available information to EPA that the State’s RH SIP is or may be inadequate to ensure 

reasonable progress due to emissions from sources in another country; or 4) revise its RH SIP 

within one year to address the deficiencies if the State determines that its existing plan is or may 

be inadequate to ensure reasonable progress in one or more Class I areas due to emissions from 

sources within the State. 

 

2 Please refer to 40 CFR 51.308(h) for the exact Rule requirements. 
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steps to ensure the accuracy of this version, but it is not the official version. 

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A state must document that it provided FLMs with an opportunity for consultation prior 

to holding a public hearing on a RH SIP or plan revision as required in 40 CFR 51.308(i)(2). In 

addition, a state must include a description of how it addressed any comments from the FLMs, 

and provide procedures for continuing consultation with the FLMs as required in 40 CFR 

51.308(i)(3) and (4). 

V. EPA’s Evaluation of California’s Progress Report 

This section describes California’s Progress Report and EPA’s evaluation of the Report 

in relation to the seven elements listed in 40 CFR 51.308(g) and the determination of adequacy 

in 40 CFR 51.308(h). We also review the requirement in 40 CFR 51.308(i)(2) for state and FLM 

coordination on a plan revision. However, to facilitate a better understanding of the Report’s 

contents, we first provide background information on the framework for measuring visibility 

progress, the causes of haze in California, and the sources of data used in the Report. 

Framework for Measuring Progress: Visibility conditions at California’s 29 Class I 

areas are calculated in deciviews using data collected from 17 Interagency Monitoring of 

Protected Visual Environments (IMPROVE) monitors. These deciview values are then compared 

to the State’s RPGs (i.e., visibility goals) for 2018 in each Class I area. The RPGs are based on 

the annual average of the projected deciview level for the 20 percent best days and the 20 percent 

worst days measured at each Class I area. The RPGs in 2018 for the worst days, the key indicator 

of progress, are the result of atmospheric modeling based on projected emission reductions from 

control strategies in the California RH SIP as well as emission reductions expected to result from 

other Federal, state and local air quality programs among other factors. The RPGs must provide 

for an improvement in visibility on the 20 percent worst days and ensure no degradation on the 
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20 percent best days, compared to average visibility conditions during the baseline period from 

2000 to 2004. 

Causes of Haze: The three primary drivers of haze on the worst days in California are 

nitrates mostly from mobile sources, sulfates mostly from offshore and international sources, and 

organic carbon (OC) mostly from natural sources. Accordingly, California’s control strategies 

target reducing the precursors of these pollutants: nitrogen oxide (NOX) for nitrates, sulfur oxide 

(SOX) for sulfates, and reactive organic gases (ROG)3for organic carbon, along with fine 

particulate matter (PM2.5) that is directly emitted. For more information regarding the causes of 

haze in California and other background information, please refer to the California RH SIP and 

EPA’s evaluation of that SIP, both of which are available in the docket for this rulemaking.4

Data Sources for the Progress Report: CARB’s analysis is primarily based on 

IMPROVE monitoring data for the five-year period from 2007 to 2011 (i.e., current conditions) 

compared to monitoring data from 2000 to 2004 (i.e., baseline conditions). For each of these 

time periods, the RHR requires the use of a five-year average of annual average deciview values 

to represent the baseline and current conditions. CARB also relied on the “Western Regional Air 

Partnership (WRAP) Regional Summary Report,” dated June 2013, that focuses on the five years 

(2005 to 2009) following the baseline period. While the most recent IMPROVE data for 2012 

was not available in time for the Progress Report’s analysis, a summary of the 2012 monitoring 

data is appended to the Report, and is referenced to support the analysis of current conditions. 

A. Status of Control Strategies 

 

3 CARB defines ROG emissions as reactive organic gases that are a precursor to organic carbon aerosols. ROG 

means any compound of carbon, which is how EPA defines volatile organic compounds (VOC). However, the lists 

of compounds of carbon that are excluded from the respective lists of ROGs and VOCs differ to some extent. 

4 California RH SIP Section 4.7: Regional Analysis of Source Categories, Proposed rule at 76 FR 13944 (March 15, 

2011), and Final rule at 76 FR 34608 (June 14, 2011). 
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1. CARB’s Analysis 

The California RH SIP relies on the continued implementation of adopted Federal, state 

and local control measures, which were developed primarily to meet the National Ambient Air 

Quality Standards (NAAQS), to address the anthropogenic sources of haze in California. In its 

Progress Report, CARB confirms that mobile sources are the primary contributor of NOX, while 

also contributing SOX, OC, and PM2.5 to haze at Class I areas. Although many aspects of mobile 

sources are regulated by Federal laws, the Progress Report notes that California has some of the 

most aggressive and innovative State and local regulations for mobile sources in the country. The 

Progress Report lists strategies adopted and implemented by the State that target emission 

reductions from light-duty passenger vehicles, heavy-duty diesel trucks, and off-road equipment, 

which are some of the largest sources of NOX emissions. Actual measures include fuel and 

engine standards, pollution control technology, goods movement and transportation rules, and 

consumer product requirements. In addition, local air districts implement stationary source and 

other control programs including New Source Review and Prevention of Significant 

Deterioration permits that also reduce or prevent emissions that might contribute to haze. 

The Progress Report includes a list of two dozen new control strategies that were not in 

the emission inventory used to project the deciview level for the RPGs in 2018. Due to 

nonattainment of NAAQS, CARB and local districts are regularly adopting or revising rules and 

creating new incentives to reduce emissions. These new control measures should further reduce 

emissions beyond those projected from the control strategies in the California RH SIP. 

The Progress Report also includes an update on the State’s single stationary source, the 

Valero Refinery in Benicia, California, that was required to install and operate Best Available 

Retrofit Technology (BART) controls. The new control equipment includes low-NOX burners 

and selective catalytic reduction to reduce NOX, and scrubbers to remove SO2 and PM10 (large 
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steps to ensure the accuracy of this version, but it is not the official version. 

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particulate matter). These controls, installed and in operation at the Valero Refinery since 

February 2011, two years before the deadline for compliance, are already reducing emissions. 

The deciview and light extinction data from 2011 (20.2 dv) and 2012 (20.1) for Point Reyes 

National Seashore, the most affected Class I area by emissions from this source, are already 

showing a reduction in nitrates and sulfates compared to 2010 (22 dv). 

2. EPA’s Evaluation 

EPA proposes to find that CARB adequately addresses the requirement in 40 CFR 

51.308(g)(1) to describe the status of all measures included in the California RH SIP. CARB 

generally describes the types of measures in its RH SIP, and includes new control strategies that 

should contribute to further improvement in visibility. The report identifies NOX emissions from 

mobile sources as the primary source of anthropogenic emissions causing or contributing to haze, 

and focuses on related control measures. The report also includes the status of BART controls at 

the Valero Refinery, the only identified source in California subject to BART. In response to a 

comment from FLMs requesting additional information regarding Federal and state regulations 

that were accounted for in California’s RPGs, CARB noted that its RH SIP submitted in 2009 

included a discussion of the regulations used to establish the RPGs for 2018.5 The RH SIP is 

included in the docket for this action. A listing of state and local California air district rules 

within the federally enforceable SIP, is available at: 

http://www.epa.gov/region9/air/sips/index.html. 

B. Emission Reductions and Progress 

1. CARB’s Analysis 

 

5 Progress Report Appendix E: Comments of Federal Land Management Agencies with CARB Responses. 
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CARB provides a recently updated California Statewide Emission Inventory from 2000 

to 2020 at five-year intervals that demonstrates steadily decreasing emissions of regional haze 

precursors (i.e., NOX, ROG, SOX, and PM2.5) from about 75 categories of sources.6 NOX

emissions are expected to decrease from about 1.4 million tons per year (tpy) in 2000 to 567,000 

tpy in 2020. ROG emissions are expected to decrease from about 1 million tpy in 2000 to 

570,000 tpy in 2020. SOX emissions are expected decrease from about 106,000 tpy in 2000 to 

30,000 tpy in 2020. PM2.5 emissions are expected to decrease from about 241,000 tpy in 2000 to 

151,000 tpy in 2020. 

Statewide emissions also are summarized by pollutant for each of the three major 

categories of sources: stationary, area, and mobile.7 Of particular interest are NOX emissions 

from mobile sources, which are expected to decrease from about 1.1 million tpy in 2000 to 

995,000 tpy in 2005; 706,000 tpy in 2010; 557,000 tpy in 2015; and 434,000 tpy in 2020. The 

statewide emissions inventory and summary are accompanied by a graph of statewide inventory 

trends that shows decreasing emissions for all four visibility-impairing pollutants from 2000 to 

2020. Mobile source emissions of NOX, ROG, SOX, and PM2.5, listed above in tpy, are projected 

to decline by about 60, 65, 85, and 50 percent, respectively, from 2000 to 2020.8 Stationary and 

area sources for these four pollutants are also projected to decline over this 20-year period. 

Overall statewide emissions of NOX, ROG, SOX, and PM2.5 for stationary, area, and mobile 

sources are expected to decline by almost 40 percent from 2000 to 2020. 

2. EPA’s Evaluation 

 

6

Id. Appendix B: Emission Inventory 2013 Almanac. 

7 Id. California Statewide Inventory Summary, Table 2, page 9. 

8

Id. California Statewide Inventory Trends, Figure 3, page 10. 
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EPA proposes to find that CARB adequately addresses the requirements in 40 CFR 

51.308(g)(2) to provide a summary of the emission reductions achieved through implementation 

of the control measures relied upon to achieve the RPGs. The trend analysis for the largest 

category of emissions, NOX from mobile sources, indicates that these emissions are expected to 

decline from 1,131,500 tons per year in 2000 to 433,620 tons per year by 2020, a reduction of 

almost 62 percent. As reported by CARB, statewide emissions of ROG, SOX, and PM2.5 are also 

declining over this 20-year time period. 

We also propose to find that CARB adequately addresses the requirement in 40 CFR 

51.308(g)(4) to analyze the change in emissions over the past five years of pollutants 

contributing to visibility impairment from all sources and activities within the state, using the 

most recently updated emissions inventory. The California Statewide Emission Inventory is 

recently updated and includes inventories for 2005 and 2010 that represent the past five years. 

C. Visibility Progress 

1. CARB’s Analysis 

CARB addresses progress on the 20 percent best days and 20 percent worst days by 

comparing current conditions (five-year average from 2007 to 2011) to baseline conditions (fiveyear average from 2000 to 2004), and current conditions on worst days to the RPGs in 2018. A 

summary of progress on best and worst days is shown in Tables 1 and 2 that are adapted from the 

Progress Report.9 As shown in the tables, CARB divides the 17 monitors and 29 Class I areas 

into four regional zones for its analysis: Northern California, Sierra California, Coastal 

California, and Southern California. 

TABLE 1—SUMMARY OF PROGRESS ON BEST DAYS

(IN DECIVIEWS) 

 

9

Id. Statewide 2018 Reasonable Progress Goal Summary, Table 3, page 12, and Revised Table 3. 
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IMPROVE 

Monitor 

Class I Areas Baseline 

Best Days 

(2000-04) 

Current 

Best Days 

(2007-11) 

Visibility 

Change 

Northern California 

TRIN Marble Mountain WA 3.4 3.0 0.4 Yolla Bolly-Middle Eel WA

LABE Lava Beds NM 3.2 2.9 0.3 South Warner WA 

LAVO 

Lassen Volcanic NP 

Caribou WA 2.7 2.3 0.4

Thousand Lakes WA 

Sierra California 

BLIS Desolation WA 2.5 2.1 0.4 Mokelumne WA 

HOOV Hoover WA 1.4 1.3 0.1

YOSE Yosemite NP 3.4 2.5 0.9 Emigrant WA 

KAIS 

Ansel Adams WA 

Kaiser WA 2.3 1.5 0.8

John Muir WA 

SEQU Sequoia NP 8.8 7.6 1.2 Kings Canyon NP 

DOME Dome Lands WA 5.1 4.9 0.2

Coastal California 

REDW Redwood NP 6.1 5.8 0.3

PORE Point Reyes NS 10.5 8.6 1.9

PINN Pinnacles WA 8.9 7.8 1.1 Ventana WA 

RAFA San Rafael WA 6.4 5.2 1.2

Southern California 

SAGA San Gabriel WA 4.8 4.5 0.3 Cucamonga WA 

SAGO San Gorgonio WA 5.4 4.0 1.4 San Jacinto WA 

AGTI Agua Tibia WA 9.6 7.1 2.5

JOSH Joshua Tree NP 6.1 4.8 1.3

WA = Wilderness Area NM = National Monument NP = National Park NS = National Seashore 

TABLE 2—SUMMARY OF PROGRESS ON WORST DAYS

(IN DECIVIEWS) 

IMPROVE 

Monitor 

Class I Areas Baseline 

Worst 

Days 

(2000-04) 

Current 

Worst 

Days 

(2007-11) 

Visibility 

Change 

RPG 

(2018) 

Current 

Progress 

to RPG 

Northern California 
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TRIN Marble Mountain WA 17.4 15.2 2.1 16.4 210% Y.B.-Middle Eel WA 

LABE Lava Beds NM 15.1 13.0 2.1 14.4 300% South Warner WA 

LAVO 

Lassen Volcanic NP 

Caribou WA 14.1 15.6 -1.5 13.3 -188%

Thousand Lakes WA 

Sierra California 

BLIS Desolation WA 12.6 13.0 -0.4 12.3 -133% Mokelumne WA 

HOOV Hoover WA 12.9 11.5 1.4 12.5 350%

YOSE Yosemite NP 17.6 16.0 1.6 16.7 178% Emigrant WA 

KAIS 

Ansel Adams WA 

Kaiser WA 15.5 14.9 0.6 14.9 100%

John Muir WA 

SEQU Sequoia NP 25.4 22.3 3.1 22.7 115% Kings Canyon NP 

DOME Dome Lands WA 19.4 18.3 1.1 18.1 85%

Coastal California 

REDW Redwood NP 18.5 18.5 0 17.8 0%

PORE Point Reyes NS 22.8 21.6 1.2 21.3 80%

PINN Pinnacles WA 18.5 17.5 1.0 16.7 56% Ventana WA 

RAFA San Rafael WA 18.8 18.0 0.8 17.3 53%

Southern California 

SAGA San Gabriel WA 19.9 18.0* 1.9 17.4 76%* Cucamonga WA 

SAGO San Gorgonio WA 22.2 18.7 3.5 19.9 152% San Jacinto WA 

AGTI Agua Tibia WA 23.5 19.8 3.7 21.6 195%

JOSH Joshua Tree NP 19.6 16.1 3.5 17.9 206%

WA = Wilderness Area NM = National Monument NP = National Park NS = National Seashore 

* This data is from 2005 to 2008 due to fire damage to the monitor in 2009. 

Current visibility conditions have improved on the 20 percent best days at all California’s 

Class I areas as indicated in the last column of Table 1 that shows positive visibility change 

compared to the best days baseline for all 17 monitors.10 On the 20 percent worst days, the 

current conditions already meet the RPGs for 2018 at nine of the 17 monitors as shown in Table 

2. At five monitors, current conditions on worst days range from 53 to 85 percent of the 

 

10 See Revised Table 3, Technical Correction for Current Best Days (2007-2011), August 6, 2014. 
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improvement in visibility needed to meet the respective RPGs. At the remaining three monitors, 

current conditions on worst days indicate that six Class I areas are not making progress in 

achieving the RPGs. 

The Progress Report explains that the limited progress in improving visibility at six Class 

I areas, all located in northern California, is due to smoke from wildfires as documented in 

Appendix D of the Progress Report.11 The six Class I areas and the associated monitors are 

Lassen Volcanic National Park, Caribou Wilderness Area, and Thousand Lakes Wilderness Area 

(LAVO); Desolation Wilderness Area and Mokelumne Wilderness Area (BLIS); and Redwood 

National Park (REDW). CARB explains that wildfire smoke has caused unusually high 

deciviews on the worst days at the LAVO monitor in 2008 and 2009, at the BLIS monitor in 

2007 and 2008, and at the REDW monitor in 2008. CARB provides technical analyses of how 

wildfire smoke can elevate the deciview value on a sufficient number of the 20 percent worst 

days to increase the annual average deciview as well as skew the five-year average deciview at a 

given monitor. CARB also notes that offshore emissions from ocean vessels may contribute to 

sulfate formation that impairs visibility at some remote monitors near the coast where there are 

no other major sources of sulfates.12 This may be the case for Pinnacles Wilderness Area and 

Ventana Wilderness Area (PINN), and Redwood National Park (REDW), where visibility 

improvement during the current five-year period is slower than elsewhere, although these three 

Class I areas are affected by wildfire smoke in some years as well. 

CARB also includes a Statewide 2018 Reasonable Progress Goal Summary using 2012 

Data13 that represents the five-year average for current conditions from 2008 to 2012. This 

updated table shows that on the worst days only three Class I areas represented by one monitor 

 

11 Id. Appendix D: Technical Analyses of Factors Impeding Progress.

12 Id. Page 11.

13 Id, Appendix C: Deciview Record (2000-2012), Table C-3. 
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steps to ensure the accuracy of this version, but it is not the official version. 

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(LAVO) have worse visibility during current conditions (15.6 dv) compared to the baseline (14.1 

dv). Of the remaining 16 monitors, 14 already exceed and two (REDW and PINN) are expected 

to meet the RPGs in 2018 for the worst days based on trends reflected by the updated current 

conditions. On the best days, the average current conditions from 2008 to 2012 meet or exceed 

the RPGs at all 17 monitors. 

2. EPA’s Evaluation 

EPA proposes to find that CARB adequately addresses the requirement in 40 CFR 

51.308(g)(3) to assess the visibility conditions and changes in each of the State’s Class I areas 

for the least and most impaired days in terms of the five-year averages of the annual values. 

CARB describes progress at each of the Class I areas on the best and worst days using data from 

the IMPROVE monitors to analyze changes in visibility conditions for current conditions (2007 

to 2011), current conditions compared to baseline conditions, and over the past five years, which 

is essentially equivalent to the baseline comparison. 

D. Assessment of Changes Impeding Visibility Progress 

1. CARB’s Analysis 

The Progress Report includes an assessment of changes in natural and anthropogenic 

emissions that impede visibility progress based on a review of emission inventories, monitoring 

data, and other sources of information.14 CARB identifies three factors, largely beyond the 

State’s control, that interfere with progress toward improved visibility on worst days at some of 

its Class I areas. These factors are wildfire smoke from natural sources, offshore shipping 

emissions from anthropogenic sources largely outside California’s jurisdiction, and Asian dust 

from natural and anthropogenic sources outside of California’s jurisdiction. Each of these types 

 

14 Id. Section 4, pages 13-17. 
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steps to ensure the accuracy of this version, but it is not the official version. 

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of emissions can cause a spike in pollutants at a sampling monitor that could be included in the 

20 percent worst days. Wildfire smoke results in elevated levels of organic carbon. Offshore 

shipping results in elevated levels of sulfates at monitors near the coast during the summer. 

Asian dust combined with industrial pollution in the form of coarse mass and fine soils are 

transported in the jet stream over the Pacific Ocean, especially during the spring. 

CARB provides documentation and analysis supporting the fact that wildfires are 

occurring more frequently in California over the past decade.15 Wildfire smoke can cause 

increases in organic carbon concentrations at monitors for several consecutive days or weeks. In 

some cases, the effect of wildfires is high enough to increase the deciview value of the annual as 

well as five-year averages on the 20 percent worst days. The Progress Report includes the 

example of a large number of wildfires in northern California known as the “2008 Lightning 

Strike Complex” that occurred in June through August 2008. These fires had an overwhelming 

impact on visibility progress at many monitors throughout California and the West.16 CARB 

includes in the Report a satellite photo of smoke plumes on July 9, 2008, that indicates the 

location of the three monitors (REDW, BLIS, and LAVO) where visibility progress was lagging 

during the current conditions time period (2007 to 2011).17 Moreover, with 80 percent of the 

State considered wildland18 and smoke drifting long distances, all of California’s Class I areas 

are susceptible to wildfires. 

2. EPA’s Evaluation 

EPA proposes to find that CARB adequately addresses the requirement in 40 CFR 

51.308(g)(5) to assess any significant changes in anthropogenic emissions within or outside the 

 

15 Id. Wildfire Acreage Burned in California, 1950-2010, Figure 4, page 14. 

16 Id, The 2008 “Lightning Strike Complex,” Figure 5, page 15. 

17 Id, NASA Satellite Photo: July 9, 2008, Figure 6, page 16.

18 Id, Wildfire Frequency and Intensity, Figure 7, page 17. 
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steps to ensure the accuracy of this version, but it is not the official version. 

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state over the past five years that have limited or impeded progress in reducing emissions and 

improving visibility. While CARB’s analysis primarily focuses on wildfires, it also discusses the 

effects of emissions from offshore shipping and Asian dust. 

E. Assessment of Current Strategy 

1. CARB’s Analysis 

The Progress Report asserts that California’s current control strategy is on track to meet 

the RPGs for 2018 at all 29 Class I areas throughout the State. CARB cites the IMPROVE data 

for 2011 in which each of the Class I areas is already below the 2018 visibility goal. Moreover, 

the State continues to strengthen existing control measures, adopt new control measures, and 

develop plans with even newer measures to meet upcoming NAAQS as well as other new 

Federal and State air quality requirements. 

The Progress Report indicates that the current strategy also is sufficient to lessen the 

impact of California’s emissions on neighboring states. In the California RH SIP, CARB 

determined that the State’s emissions contributed about three percent or less of nitrate on the 

worst days at Jarbidge Wilderness Area in Nevada; Kalmiopsis Wilderness Area and Crater Lake 

National Park in Oregon; and Sycamore Canyon Wilderness Area and Grand Canyon National 

Park in Arizona. With California NOX emissions projected to decrease by about 60 percent from 

2000 to 2020, these small contributions will be further reduced. 

2. EPA’s Evaluation 

EPA proposes to find that CARB adequately addresses the requirement in 40 CFR 

51.308(g)(6) to assess whether the current elements and strategies in the RH SIP are sufficient to 

enable California, or other states affected by California’s emissions, to meet all established 

RPGs. As described above, monitoring data indicates current visibility conditions already meet 
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steps to ensure the accuracy of this version, but it is not the official version. 

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or exceed the RPGs for the 20 percent best days at all of the State’s Class I areas. In addition, 26 

of the State’s 29 Class I areas have already achieved the 2018 RPGs for the worst days or are on 

track to meet those RPGs by 2018. The lack of progress at the three remaining areas on the worst 

20 percent days is largely due to wildfires. Significant emission reductions within California are 

also expected to benefit Class I areas outside the State that are affected by California’s 

emissions. CARB provides sufficient evidence to demonstrate that its current strategy is 

adequate to enable all affected Class I areas to meet the RPGs for 2018. 

F. Review of Visibility Monitoring Strategy 

1. CARB’s Analysis 

California will continue to rely on the IMPROVE network to collect and analyze the 

visibility data, and has no need to make any changes. CARB reports that the Station Fire in 

August 2009 destroyed the SAGA monitor that represents San Gabriel Wilderness Area and 

Cucamonga Wilderness Area. For this reason, the current conditions on the worst days for the 

SAGA monitor are based on 2005 to 2008, instead of 2007 to 2011. However, the monitoring 

site was reestablished in October 2011. 

2. EPA’s Evaluation 

EPA proposes to find that CARB adequately addresses the requirement in 40 CFR 

51.308(g)(7) to review its visibility monitoring strategy and make any modifications as 

necessary. We agree that there is no need to modify California’s monitoring network for 

measuring visibility at this time. 

G. Determination of Adequacy 

1. CARB’s Determination 
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steps to ensure the accuracy of this version, but it is not the official version. 

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CARB has determined that no substantive revision of the RH SIP is warranted at this 

time in order to achieve the RPGs for visibility improvement by 2018. Visibility trends for the 

worst days show improvement at every monitor except for the three monitors (LAVO, BLIS, and 

REDW) influenced by years with wildfires. Further, current visibility conditions on best days 

(2007 to 2011) at all monitors are better than the baseline period. Based on reductions in 

anthropogenic sources of emissions in California and the concurrent improvement in visibility at 

all of California’s Class I area monitors, CARB determines that the current RH SIP strategies are 

sufficient to enable California and its neighboring states to meet their RPGs for 2018. 

2. EPA’s Evaluation 

EPA proposes to find that CARB adequately addresses the requirements in 40 CFR 

51.308(h) by determining that the existing California RH SIP requires no substantive revisions at 

this time to achieve the established RPGs at Class I areas affected by the State’s sources. EPA 

concurs with the State’s determination based on the analysis and documentation presented in the 

Progress Report. The Report provides evidence of declining emissions from anthropogenic 

sources within the State’s control and improving visibility on worst days at all the monitors 

except when influenced by wildfires. Visibility on best days is also improving at all monitors, 

which are already meeting the RPGs for the best days. 

H. Consultation with Federal Land Managers 

1. CARB’s Consultation 

CARB conducted timely outreach in January 2014 to the FLMs including the U.S. 

National Park Service (NPS) and the U.S. Forest Service (USFS), which manage the national 

parks and wildlife areas in California. The NPS responded in a letter dated March 27, 2014, that 

agreed with CARB’s conclusion that emission reductions are sufficient to meet the RPGs for 
This document is a prepublication version, signed by Jared Blumenfeld, Regional Administrator, on September 17, 2014. We have taken 

steps to ensure the accuracy of this version, but it is not the official version. 

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2018, and offered suggestions to strengthen the Report. The USFS responded in a letter dated 

April 8, 2014, that CARB has demonstrated it is on a technically sound path for improving 

visibility in Class I areas. CARB’s responses to the comments from NPS and USFS are included 

in Appendix E of the Report. 

CARB has submitted to EPA a Public Notice and Hearing Transcript along with a 

certified copy of Air Resources Board Resolution 14-15 dated May 22, 2014, the date of the 

public hearing at which the Board approved the Progress Report. Resolution 14-15 certifies that 

CARB provided a copy of the draft Progress Report to the FLMs on January 28, 2014, and on 

March 11, 2014, held a conference call to discuss the draft Report. In the response to comments, 

CARB commits to continuing policy discussions through the regular Air and Land Mangers 

meetings held between the State and FLMs. 

2. EPA’s Evaluation 

EPA proposes to find that CARB has addressed the requirements in 40 CFR 51.308(i)(2), 

(3), and (4) to provide FLMs with an opportunity for consultation in person and at least 60 days 

prior to a public hearing on the SIP revision; include a description in the SIP revision of how it 

addressed any comments from the FLMs; and provide procedures for continuing consultation 

between the State and FLMs. 

VI. EPA’s Proposed Action 

EPA is proposing to approve the California Regional Haze Plan 2014 Progress Report 

submitted to EPA on June 16, 2014, as meeting the applicable RHR requirements as set forth in 

40 CFR 51.308(g), (h), and (i). 

VII. Statutory and Executive Order Reviews 
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steps to ensure the accuracy of this version, but it is not the official version. 

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Under the CAA, the Administrator is required to approve a SIP submission that complies 

with the provisions of the Act and applicable Federal regulations.19 Thus, in reviewing SIP 

submissions, EPA’s role is to approve state decisions, provided that they meet the criteria of the 

CAA. Accordingly, this proposed action is to approve state law as meeting Federal requirements, 

and does not impose additional requirements beyond those imposed by state law. For that reason, 

this proposed action: 

• is not a ‘‘significant regulatory action’’ subject to review by the Office of Management and 

Budget under Executive Order 12866 (58 FR 51735, October 4, 1993); 

• does not impose an information collection burden under the provisions of the Paperwork 

Reduction Act (44 U.S.C. 3501 et seq.); 

• is certified as not having a significant economic impact on a substantial number of small 

entities under the Regulatory Flexibility Act (5 U.S.C. 601 et seq.); 

• does not contain any unfunded mandate or significantly or uniquely affect small governments, 

as described in the Unfunded Mandates Reform Act of 1995 (Pub. L. 104–4); 

• does not have Federalism implications as specified in Executive Order 13132 (64 FR 43255, 

August 10, 1999); 

• is not an economically significant regulatory action based on health or safety risks subject to 

Executive Order 13045 (62 FR 19885, April 23, 1997); 

• is not a significant regulatory action subject to Executive Order 13211 (66 FR 28355, May 22, 

2001); 

• is not subject to requirements of Section 12(d) of the National Technology Transfer and 

Advancement Act of 1995 (15 U.S.C. 272 note) because application of those requirements 

would be inconsistent with the CAA; and 

 

19 42 U.S.C. 7410(k); 40 CFR 52.02(a). 
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steps to ensure the accuracy of this version, but it is not the official version. 

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• does not provide EPA with the discretionary authority to address, as appropriate, 

disproportionate human health or environmental effects, using practicable and legally 

permissible methods, under Executive Order 12898 (59 FR 7629, February 16, 1994). 

In addition, this rule does not have tribal implications as specified by Executive Order 13175 (65 

FR 67249, November 9, 2000), because the SIP is not approved to apply in Indian country 

located in the state. EPA notes that it will not impose substantial direct costs on tribal 

governments or preempt tribal law. 

List of Subjects in 40 CFR Part 52 

Environmental protection, Air pollution control, Intergovernmental relations, Nitrogen oxides, 

Organic carbon, Particulate matter, Reporting and recordkeeping requirements, Sulfur oxides, 

Visibility, Volatile organic compounds. 

AUTHORITY: 42 U.S.C. 7401 et seq.

September 17, 2014 /s/ 

__________________________________ __________________________________ 

Dated: Jared Blumenfeld 

 Regional Administrator 

 Region IX