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Pio Pico Energy Center (SD 11-01) 

Proposed PSD Permit

June 2012

PIO PICO ENERGY CENTER (SD 11-01)

PREVENTION OF SIGNIFICANT DETERIORATION PERMIT

PROPOSED PERMIT CONDITIONS

PROJECT DESCRIPTION

The proposed Pio Pico Energy Center (Project) consists of three General Electric (GE) LMS100 

natural gas-fired combustion turbine-generators (CTGs) rated at 100 megawatt each. The Project 

will have an electrical output of 300 MW. The Project will be located in an unincorporated area 

of San Diego County known as Otay Mesa. The Project’s footprint is a 9.99 acre parcel located

at 7363 Calzada de la Fuente in the Otay Mesa Business Park. The site is located within the San 

Diego County Air Pollution Control District (SDAPCD, or District). 

This proposed Prevention of Significant Deterioration (PSD) permit for the Project requires the 

use of Best Available Control Technology (BACT) to limit emissions of nitrogen oxides (NOX), 

total particulate matter (PM), particulate matter 10 micrometers (μm) in diameter and smaller 

(PM10), particulate matter 2.5 μm in diameter and smaller (PM2.5), and greenhouse gases (GHG), 

to the greatest extent feasible. Air pollution emissions from the Project will not cause or 

contribute to violations of any National Ambient Air Quality Standards (NAAQS) or any 

applicable PSD increments for the pollutants regulated under the PSD permit. 
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Pio Pico Energy Center (SD 11-01) 

Proposed PSD Permit

June 2012

EQUIPMENT LIST

The following devices and activities are subject to this PSD permit:

Unit ID Description

Turbine 1  100 MW (gross) combustion turbine generator (CTG), with a maximum heat 

input rate of 903 MMBtu/hr (HHV)

 Natural gas-fired GE Model LMS100 CTG

 Emissions of NOX controlled by water injection, Selective Catalytic Reduction 

(SCR)

Turbine 2  100 MW (gross) combustion turbine generator (CTG), with a maximum heat 

input rate of 903 MMBtu/hr (HHV)

 Natural gas-fired GE Model LMS100 CTG

 Emissions of NOX controlled by water injection, Selective Catalytic Reduction 

(SCR)

Turbine 3  100 MW (gross) combustion turbine generator (CTG), with a maximum heat 

input rate of 903 MMBtu/hr (HHV)

 Natural gas-fired GE Model LMS100 CTG

 Emissions of NOX controlled by water injection, Selective Catalytic Reduction 

(SCR)

Partial Dry 

Cooling 

System

 Dry cooling tower with a 16,520 gallons per minute (GPM) maximum 

circulation rate, supplemented by 7,000 GPM wet cooling tower. 

 Total dissolved solids (TDS) concentration in makeup water of 5,600 ppm (560

mg/L) 

 Drift eliminator with drift losses less than or equal to 0.001 percent based on 

circulation rate

Circuit 

Breakers

 3 switchyard and 2 generator breakers containing SF6

PERMIT CONDITIONS

I. PERMIT EXPIRATION

As provided in 40 CFR § 52.21(r), this PSD Permit shall become invalid if construction:

A. is not commenced (as defined in 40 CFR § 52.21(b)(9)) within 18 months after 

the approval takes effect; or

B. is discontinued for a period of 18 months or more; or 
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Pio Pico Energy Center (SD 11-01) 

Proposed PSD Permit

June 2012

C. is not completed within a reasonable time. 

II. PERMIT NOTIFICATION REQUIREMENTS

The Permittee shall notify EPA Region IX by letter or by electronic mail of the:

A. date construction is commenced, postmarked within 30 days of such date; 

B. actual date of initial startup, as defined in 40 CFR § 60.2, postmarked within 15 

days of such date; 

C. date upon which initial performance tests will commence, in accordance with the 

provisions of Condition IX.G, postmarked not less than 30 days prior to such date. 

Notification may be provided with the submittal of the performance test protocol 

required pursuant to Condition IX.G; and 

D. date upon which initial performance evaluation of the continuous emissions 

monitoring system (CEMS) will commence in accordance with 40 CFR § 

60.13(c), postmarked not less than 30 days prior to such date. Notification may 

be provided with the submittal of the CEMS performance test protocol required 

pursuant to Condition IX.G. 

III. FACILITY OPERATION

At all times, including periods of startup, shutdown, shakedown, and malfunction, the 

Permittee shall, to the extent practicable, maintain and operate the facility that is subject 

to this PSD permit (Facility), including associated air pollution control equipment, in a 

manner consistent with good air pollution control practice for minimizing emissions. 

Determination of whether acceptable operating and maintenance procedures are being 

used will be based on information available to EPA, which may include, but is not 

limited to, monitoring results, opacity observations, review of operating maintenance 

procedures and inspection of the Facility. 

IV. MALFUNCTION REPORTING

A. The Permittee shall notify EPA at R9.AEO@epa.gov within two (2) working days 

following the discovery of any failure of air pollution control equipment or
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Pio Pico Energy Center (SD 11-01) 

Proposed PSD Permit

June 2012

process equipment, or failure of a process to operate in a normal manner, which 

results in an increase in emissions above any allowable emission limit stated in 

Section IX of this permit.

B. In addition, the Permittee shall provide an additional notification to EPA in 

writing or electronic mail within fifteen (15) days of any such failure described 

under Condition IV.A. This notification shall include a description of the 

malfunctioning equipment or abnormal operation, the date of the initial 

malfunction, the period of time over which emissions were increased due to the 

failure, the cause of the failure, the estimated resultant emissions in excess of 

those allowed in Section IX, and the methods utilized to mitigate emissions and 

restore normal operations. 

C. Compliance with this malfunction notification provision shall not excuse or 

otherwise constitute a defense to any violation of this permit or any law or 

regulation such malfunction may cause. 

V. RIGHT OF ENTRY

The EPA Regional Administrator, and/or an authorized representative, upon the 

presentation of credentials, shall be permitted:

A. to enter the premises where the Facility is located or where any records are 

required to be kept under the terms and conditions of this PSD Permit; 

B. during normal business hours, to have access to and to copy any records required 

to be kept under the terms and conditions of this PSD Permit; 

C. to inspect any equipment, operation, or method subject to requirements in this

PSD Permit; and

D. to sample materials and emissions from the source(s).

VI. TRANSFER OF OWNERSHIP

In the event of any changes in control or ownership of the Facility, this PSD Permit shall 

be binding on all subsequent owners and operators. Within 14 days of any such change 

in control or ownership, the Permittee shall notify the succeeding owner and operator of 

the existence of this PSD Permit and its conditions by letter. The Permittee shall send a 
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Pio Pico Energy Center (SD 11-01) 

Proposed PSD Permit

June 2012

copy of this letter to EPA Region IX within thirty (30) days of its issuance.

VII. SEVERABILITY

The provisions of this PSD Permit are severable, and, if any provision of the PSD Permit 

is held invalid, the remainder of this PSD Permit shall not be affected.

VIII. ADHERENCE TO APPLICATION AND COMPLIANCE WITH OTHER 

ENVIRONMENTAL LAWS

The Permittee shall construct the Project in compliance with this PSD permit, the 

application on which this permit is based, and all other applicable federal, state, and local 

air quality regulations. This PSD permit does not release the Permittee from any liability 

for compliance with other applicable federal, state and local environmental laws and 

regulations, including the Clean Air Act.

IX. SPECIAL CONDITIONS

A. Air Pollution Control Equipment and Operation

As soon as practicable following initial startup of the power plant (startup as 

defined in 40 CFR § 60.2) but prior to commencement of commercial operation 

(as defined in 40 CFR § 72.2), and thereafter, except as noted below in Condition 

IX.C, the Permittee shall install, continuously operate, and maintain the SCR 

system for control of NOX on Turbine 1, Turbine 2, and Turbine 3. The Permittee

shall also perform any necessary operations to minimize emissions so that 

emissions are at or below the emission limits specified in this permit. 
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Pio Pico Energy Center (SD 11-01) 

Proposed PSD Permit

June 2012

B. Emission Limits

1. On and after the date of initial startup, the Permittee shall not discharge or 

cause the discharge of emissions from each CTG (Turbine 1, Turbine 2, and 

Turbine 3) into the atmosphere in excess of the following limits. The 

emission limits in this condition shall apply at all times, except that for NOx 

only, the alternate emission limits in Condition IX.C shall apply during startup 

and shutdown, after which the limits in this condition shall apply: 

Pollutant Emission Limit (per CTG) 

NOX

 2.5 ppmvd @ 15% O2

 1-hr average

 8.18 lb/hr

PM, PM10, and 

PM2.5

 0.0065 lb/MMBtu (HHV)

 9-hr average

 PUC-quality natural gas 

(sulfur content of no 

greater than 0.25 grains per 

100 dscf on a 12-month

rolling average and not 

greater than 1.0 gr per 100 

dscf at any time)

CO2

 1,181 lb/MWh net output

 8,760 rolling operatinghour average

2. CO2e emissions from the circuit breakers shall not exceed 40.2 tons per 

calendar year. 

3. The Permittee shall install, operate, and maintain enclosed-pressure SF6 

circuit breakers with a maximum annual leakage rate of 0.5% by weight. 

C. Requirements during Gas Turbine (Turbine 1, Turbine 2, and Turbine 3)

Startup and Shutdown Periods

The CTG NOX emission limits in Condition IX.B.1 shall not apply during CTG

startup and shutdown periods. During these periods, the following requirements 

shall apply: 

1. The CEMS shall be in operation during each startup and shutdown period. 
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Pio Pico Energy Center (SD 11-01) 

Proposed PSD Permit

June 2012

2. Duration of startups and shutdowns of each CTG (Turbine 1, Turbine 2, 

and Turbine 3) shall not exceed 30 and 10.5 minutes, respectively, per 

occurrence.

3. Total number of startups shall not exceed 500 per turbine, per calendar 

year.

4. For CTGs, “initial startup” is defined as the first fire of each unit.

5. Startup is defined as the period beginning with combustion turbine 

ignition and lasting until the equipment has reached a continuous 

operating level and the emissions from the turbines are at or below the 

emission limits specified in Condition IX.B.1.

6. Shutdown is defined as the period beginning with the initiation of 

combustion turbine shutdown sequence and lasting until fuel flow is 

completely off and combustion has ceased.

7. NOX emissions during startup or shutdown from each CTG shall not 

exceed 26.6 lb/hr based on a 1-hr average.

8. NOx emissions from each CTG shall not exceed 22.5 pounds per startup 

event, or 6.0 pounds per shutdown event.

D. Operational Limits

1. The hours of operation for each turbine (Turbine 1, Turbine 2, and Turbine 3) 

shall not exceed 4,000 hours in any calendar year.

2. During any turbine startup, ammonia injection shall be initiated as soon as the 

SCR catalyst temperature exceeds 575 degrees F. 

3. The cooling tower drift rate shall not exceed 0.001%; and the maximum total 

dissolved solids (TDS) shall not exceed 5,600 ppm.

4. Within 60 days after achieving normal operation, but not later than 180 days 

after the initial startup of equipment, each CTG (Turbine 1, Turbine 2, and 

Turbine 3) shall achieve an initial heat rate at full load that does not exceed 

9,196 Btuhhv/kWhgross. 

5. The circuit breakers shall be equipped with a 10% by weight leak detection 

system. The leak detection system shall be calibrated in accordance with 

manufacturer’s specifications. The manufacturer’s specifications and records 

of all calibrations shall be maintained on site. 
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Pio Pico Energy Center (SD 11-01) 

Proposed PSD Permit

June 2012

E. Fuel Use

1. To fire Turbines 1, 2 and 3, the Permittee shall use only Public Utilities 

Commission (PUC)-pipeline quality natural gas with a sulfur content that (1) 

is less than or equal to 0.25 grains per 100 dscf on a 12-month rolling average, 

and (2) shall not at any time exceed 1.0 grains per 100 dscf.

2. The Permittee shall keep a monthly record of the quantity of natural gas used 

in Turbine 1, Turbine 2, and Turbine 3. 

3. The Permittee shall sample and record the sulfur content of the natural gas 

fuel on a monthly basis. 

4. The fuel sulfur content of the natural gas shall be determined using any of the 

following test methods: ASTM D1072, D3246, D4468, D5504 or D6667. 

F. Continuous Emissions Monitoring System (CEMS) for Turbines

1. Before Turbines 1, 2, and 3 commence commercial operation (as defined in 

40 CFR § 72.2), the Permittee shall install and calibrate CEMS to measure 

stack gas NOX, CO2, and O2 concentrations and a continuous monitoring 

system (CMS) to measure exhaust gas flow and moisture content to 

demonstrate compliance with the emission limits in Conditions IX.B.1, 

IX.C.7, and IX.C.8. 

2. The CEMS and CMS required by this permit shall be installed, calibrated, 

operated, audited, tested, and maintained in accordance with the 

manufacturers’ recommendations and the appropriate performance standards 

and quality assurance requirements in the appendices of either 40 CFR part 

60 or 40 CFR part 75.

3. The Permittee shall reduce CEMS and CMS data to one-hour averages in a 

manner meeting the specifications in 40 CFR § 60.13(h) for all operating 

hours, including startup and shutdown. 

4. No later than 90 days after commencement of commercial operation, the 

Permittee shall submit to EPA a CEMS and CMS quality assurance plan. 

The plan shall specify how the Permittee will demonstrate compliance with 

emission limits in Conditions IX.B.1, IX.C.7, and IX.C.8, including 

emission limits that apply during startup and shutdown.

5. The Permittee shall perform for each CEMS:
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Pio Pico Energy Center (SD 11-01) 

Proposed PSD Permit

June 2012

a. Daily calibration checks,

b. Quarterly linearity checks, and

c. Annual relative accuracy test audits (RATA).

6. The Permittee shall perform initial RATAs no later than the initial 

performance test for the associated emission unit.

7. The Permittee shall submit RATA test plans and reports of RATA test 

results to EPA as described in Condition IX.G.1.h.

8. The Permittee shall maintain the following records for at least five years 

from the date of origin:

a. One-hour averages calculated pursuant to Condition IX.G.3,

b. The results of all calibration and linearity checks, and

c. RATA test plans and reports of test results.

G. Performance Tests

1. Stack Tests

a. Within 60 days after achieving normal operation, but not later than 180 

days after the initial startup of equipment, and, unless otherwise specified, 

annually thereafter (within 30 days of the initial performance test 

anniversary), the Permittee shall conduct performance tests (as described 

in 40 CFR § 60.8) as follows:

i. NOX, CO2, PM, PM10, and PM2.5 emissions from each gas turbine 

(Turbine 1, Turbine 2, and Turbine 3);

ii. PM, PM10, and PM2.5 emissions from the cooling tower (annual testing 

not required).

iii. Heat rate performance according to the requirements of the American 

Society of Mechanical Engineers Performance Test Code on Overall

Plant Performance (ASME PTC 22).

b. The Permittee shall submit a performance test protocol to EPA no later 

than 30 days prior to the test to allow review of the test plan and to arrange 

for an observer to be present at the test. The performance test shall be 
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Pio Pico Energy Center (SD 11-01) 

Proposed PSD Permit

June 2012

conducted in accordance with the submitted protocol, and any changes 

required by EPA. 

c. Performance tests shall be conducted in accordance with the test methods 

set forth in 40 CFR § 60.8 and 40 CFR Part 60 Appendix A, as modified 

below. In lieu of the specified test methods, equivalent methods may be 

used with prior written approval from EPA:

i. EPA Methods 1-4 and 7E for NOX emissions measured in ppmvd

ii. EPA Methods 1-4, 7E, and 19 for NOX emissions measured on a heat 

input basis

iii. EPA Methods 1-4 and 3B for CO2 emissions

iv. EPA Method 5 for PM, Method 201A for filterable PM10 and PM2.5, 

and Method 202 for PM10 and PM2.5. In lieu of Method 202, the 

Permittee may use EPA Conditional Test Method CTM-039.

v. Modified Method 306 for PM emissions from the wet cooling tower, 

and

vi. the provisions of 40 CFR § 60.8 (f). 

d. The initial performance test conducted after initial startup shall use the test 

procedures for a “high NO2 emission site,” as specified in San Diego Test 

Method 100, to measure NOX emissions. The source shall be classified as 

either a “low” or “high” NO2 emission site based on these test results. If 

the emission source is classified as a:

i. “high NO2 emission site,” then each subsequent performance test shall 

use the test procedures for a “high NO2 emission site,” as specified in 

San Diego Test Method 100.

ii. “low NO2 emission site,” then the test procedures for a “high NO2

emission site,” as specified in San Diego Test Method 100, shall be 

performed once every five years to verify the source's classification as 

a “low NO2 emission site.”

e. The performance test methods for NOX emissions specified in Condition 

IX.G.1.c.i and ii., may be modified as follows: 

i. Perform a minimum of 9 reference method runs, with a minimum time 

per run of 21 minutes, at a single load level, between 90 and 100 

percent of peak (or the highest physically achievable) load, and

ii. Use the test data both to demonstrate compliance with the applicable 

NOX emission limit and to provide the required reference method data 

for the RATA of the CEMS. 
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Pio Pico Energy Center (SD 11-01) 

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June 2012

f. Upon written request and adequate justification from the Permittee, EPA 

may waive a specific annual test and/or allow for testing to be done at less 

than maximum operating capacity.

g. For performance test purposes, sampling ports, platforms, and access shall 

be provided on the emission unit exhaust system in accordance with the 

requirements of 40 CFR § 60.8(e).

h. The Permittee shall furnish EPA with a written report of the results of 

performance tests within 60 days of completion.

2. Cooling Tower Total Dissolved Solids Testing

a. The Permittee shall perform weekly tests of the blow-down water quality 

using an EPA-approved method. This weekly test shall not be required for 

any 7-day period in which the wet cooling tower is not in operation, 

provided that the Permittee maintains a log of wet cooling tower 

operation. 

b. The Permittee shall maintain a log that contains the date and result of each 

blow-down water quality test, and the resulting mass emission rate. This 

log shall be maintained onsite for a minimum of five years and shall be 

provided to EPA and District personnel upon request.

c. The Permittee shall calculate the PM, PM10, and PM2.5 emission rates

using an EPA-approved calculation based on the TDS and water 

circulation rate.

d. The Permittee shall conduct all required cooling tower water quality tests 

in accordance with an EPA-approved test and emissions calculation 

protocol. Thirty (30) days prior to the first such test, the Permittee shall 

provide a written test and emissions calculation protocol for EPA review 

and approval, and send a copy to the District.

e. A maintenance procedure shall be established that states how often and 

what procedures will be used to ensure the integrity of the drift 

eliminators, to ensure that the TDS limits are not exceeded, and to ensure 

compliance with recirculation rates. This procedure is to be kept onsite 

and made available to EPA and District personnel upon request. The 

Permittee shall promptly report any deviations from this procedure.

H. Recordkeeping and Reporting 

1. The Permittee shall maintain a file of all records, data, measurements, reports, 

and documents related to operation of the Facility. All records shall be in a 

permanent form suitable for inspection. 
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Pio Pico Energy Center (SD 11-01) 

Proposed PSD Permit

June 2012

2. The Permittee shall maintain CEMS records that include the following: the 

occurrence and duration of any startup, shutdown, or malfunction, 

performance testing, evaluations, calibrations, checks, adjustments, 

maintenance, duration of any periods during which a CEMS is inoperative, 

and corresponding emission measurements.

3. The Permittee shall maintain records of the hours of operation for each turbine 

(Turbine 1, Turbine 2, and Turbine 3), on a monthly basis.

4. The Permittee shall maintain records and submit a written report of all excess 

emissions and any other noncompliance with permit conditions to EPA for 

each six-month reporting period from January 1 to June 30 and from July 1 to 

December 31, except when more frequent reporting is specifically required by 

an applicable subpart, or EPA, on a case-by-case basis, determines that more 

frequent reporting is necessary to accurately assess the compliance status of 

the source. The report shall be postmarked by the 30th day following the end 

of each semi-annual period and shall include the following:

a. Time intervals, data and magnitude of the excess emissions, the nature 

and cause (if known), corrective actions taken and preventive 

measures adopted; 

b. Applicable time and date of each period during which the CEMS was 

inoperative (monitor down-time), except for zero and span checks, and 

the nature of CEMS repairs or adjustments; 

c. A statement in the report of a negative declaration; that is, a statement 

when no excess emissions occurred or when the CEMS has not been 

inoperative, repaired, or adjusted; 

d. Any failure to conduct any required source testing, monitoring, or 

other compliance activities; and

e. Any violation of limitations on operation, including but not limited to 

restrictions on hours of operation.

5. Excess emissions shall be defined as any period in which any turbine exceeds

any emission limits set forth in this permit.

6. A period of monitor down-time shall be defined as any unit operating clock 

hour in which sufficient data are not obtained by the CEMS to validate the 

hour for NOX, CO2, or O2, while the CEMS is also meeting the requirements 

of Condition IX.F.3.

7. Excess emissions indicated by the CEM system, source testing, or compliance 

monitoring shall be considered violations of the applicable emission limit for 

the purpose of this permit.
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Pio Pico Energy Center (SD 11-01) 

Proposed PSD Permit

June 2012

8. All records required by this PSD Permit shall be retained for not less than five 

years following the date of such measurements, maintenance, reports, and/or 

records.

9. The Permittee shall measure and record the following for each CTG (Turbine 

1, Turbine 2, and Turbine 3) on an hourly basis:

a. Net energy output (MWhnet);

b. Pounds of CO2 per net energy output (lb CO2/MWhnet);

c. The 8,760-operating hour rolling average emission rate of lb 

CO2/MWhnet based on the average hourly recordings.

10. The Permittee shall maintain a log describing maintenance and repair 

activities, including the following information:

a. Date of activity

b. Description of activity

c. For scheduled maintenance, the elapsed time, hours of

turbine operation, or other applicable measure since the

activity was last performed.

d. For scheduled maintenance, the elapsed time, hours of

turbine operation, or other applicable measure until the

activity should next be performed.

11. The Permittee shall calculate the SF6 emissions due to leakage from the 

circuit breakers by using the mass balance in equation DD-1 at 40 CFR Part 

98, Subpart DD on an annual basis. Records of such calculations shall be 

maintained on site.

I. Shakedown Periods

The combustion turbine emission limits and requirements in Conditions IX.B, 

IX.C and IX.D shall not apply during combustion shakedown periods. Shakedown 

is defined as the period beginning with initial startup as defined in Condition 

IX.C.4 and ending no later than initial performance testing, during which the 

Permittee conducts operational and contractual testing and tuning to ensure the 

safe, efficient and reliable operation of the plant. The shakedown period shall not 

exceed 90 days. The requirements of Section III of this permit shall apply at all 

times.

X. AGENCY NOTIFICATIONS
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Pio Pico Energy Center (SD 11-01) 

Proposed PSD Permit

June 2012

All correspondence as required by this Approval to Construct must be sent to:

A. Director, Air Division (Attn: AIR-5)

EPA Region IX

75 Hawthorne Street

San Francisco, CA 94105-3901

Email: R9.AEO@epa.gov

Fax: (415) 947-3579

With a copy to:

B. Air Pollution Control Officer

San Diego County Air Pollution Control District

10124 Old Grove Road

San Diego, CA 92131-1649

Fax: (858) 586-2701

XI. ACROYNMS AND ABBREVIATIONS

Act Clean Air Act [42 U.S.C. Section 7401 et seq.]

Agency U.S. Environmental Protection Agency

BACT Best Available Control Technology

BTU British thermal units

CAA Clean Air Act [42 U.S.C. Section 7401 et seq.]

CEMS Continuous Emissions Monitoring System

CMS Continuous Monitoring System

CFR Code of Federal Regulations

CO Carbon Monoxide

CO2e Carbon Dioxide Equivalent

CTG Combustion Turbine Generator

GE General Electric

GHG Greenhouse Gas (Greenhouse Gases)

g/hp-hr grams per horsepower-hour

gr/scf Grains per Standard Cubic Feet

EAB Environmental Appeals Board

EPA U.S. Environmental Protection Agency

GHG Greenhouse Gases

HHV Higher Heating Value

HP Horsepower

kW Kilowatts of electrical power
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Pio Pico Energy Center (SD 11-01) 

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kWhr Kilowatt-hour

mg/L Milligrams per liter

μg/m3 Microgram per Cubic Meter

MMBTU Million British thermal units

MW Megawatts of electrical power

NAAQS National Ambient Air Quality Standards

NESHAPS National Emission Standards for Hazardous Air Pollutants

NMHC Non-methane Hydrocarbons

NO Nitrogen oxide or nitric oxide

NO2 Nitrogen dioxide

NOx Oxides of Nitrogen (NO + NO2)

NP National Park

NSPS New Source Performance Standards, 40 CFR Part 60

NSR New Source Review

O2 Oxygen

PM Total Particulate Matter

PM2.5 Particulate Matter less than 2.5 micrometers (μm) in diameter

PM10 Particulate Matter less than 10 micrometers (μm) in diameter

PPEC Pio Pico Energy Center

PPM Parts per Million

PPMVD Parts per Million by Volume, on a Dry basis

PSD Prevention of Significant Deterioration