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Ajo Area, Pima County
PM10 Nonattainment Area
Emission Sources: dry, unstable conditions of the tailings piles northeast of Ajo, paved and unpaved roads, and cleared areas.
Status: The Ajo PM10 State Implementation Plan (SIP) was submitted to EPA on Nov. 15, 1991. Dust control measures implemented include covering the tailings piles with a combination of vegetation and armoring. PM10 concentrations reported at the Ajo monitoring site between 1998 and 2000, showed no measured exceedance of the 24-hour PM10 NAAQS which indicates the Ajo area attained the 24-hour standard. Review of the annual standard for calendar years 1998, 1999 and 2000 indicates that the 3-year annual average was 21 mg/m3, thus the Ajo area also attained the annual PM10 NAAQS. ADEQ is currently developing a maintenance plan and request for redesignation to attainment for submittal to EPA.
Sulfur Dioxide Attainment Area with Maintenance Plan
Emission Sources: Ajo copper smelter stack and fugitive emissions - the smelter was dismantled in 1995.
Status: Ajo was first designated as a nonattainment area in 1978. The primary source in Ajo was the Phelps Dodge Ajo, Inc. copper smelter, which was dismantled by February 1996. In June 2002, ADEQ submitted to EPA the Ajo Sulfur Dioxide Nonattainment Area State Implementation and Maintenance Plan and request for redesignation to attainment. (Not all portions of the document are available electronically. Please contact ADEQ if you need additional information.) EPA approved the maintenance plan and redesignation in a direct final action (68 FR 62239). Ajo was redesignated to an attainment area with a maintenance plan on January 2, 2004.
Bullhead City Area, Mohave County
PM10 Attainment Area with Maintenance Plan
Emission sources: cleared construction areas, unpaved roads, and parking lots.
Status: In 1993, EPA designated the Bullhead City area a moderate PM10 nonattainment area. In June 1995, ADEQ submitted to EPA the PM10 State Implementation Plan for the Bullhead City Nonattainment Area. On Feb. 15, 2002, EPA determined that the Bullhead City PM10 Nonattainment Area did attain the 24-hour and annual PM10 National Ambient Air Quality Standards (NAAQS) by the Dec. 31, 2000, Clean Air Act deadline (67 FR 7085  ). In February 2002, ADEQ submitted to EPA the Bullhead City Moderate Area PM10 Maintenance Plan and Request for Redesignation to Attainment. (Not all portions of the document are available electronically. Please contact ADEQ if you need additional information.) EPA approved the maintenance plan and redesignation in a direct final action (67 FR 43020 ). Bullhead City was redesignated to an attainment area with a maintenance plan on Aug. 26, 2002.
Douglas Area, Cochise County
PM10 Nonattainment Area
Emission Sources: In addition to emissions originating in Mexico, unpaved road dust and paved roads, agricultural burning, cleared areas, windblown agricultural land, off road vehicles and unpaved parking lots were identified as contributing sources.
Status: The Douglas PM10 SIP was submitted to EPA June 16, 1993. Ambient monitoring data reveal that the Douglas area has met the 24-hour and annual PM10 standards for the last several years. The last 24-hour exceedance occurred in 1991 and the last annual violation occurred in 1989.
Sulfur Dioxide Nonattainment Area
Emission Sources: Douglas copper smelter stack and fugitive emissions -smelter dismantled in early 1987.
Status: Douglas was first designated as a nonattainment area in 1978. The primary source in Douglas was the Phelps
Dodge, Inc. copper smelter, which was dismantled in 1995. In December 2001, ADEQ submitted to EPA the
Douglas Sulfur Dioxide Nonattainment Area State Implementation and Maintenance Plan and Request for Redesignation to Attainment.
Hayden Area, Gila and Pinal County
PM10 Nonattainment Area
Emission Sources: In the late 1980s, contributors to monitored exceedances of PM10 in the Hayden area were the copper ore unloading, crushing and conveying activities at the Ray Unit crushing plant and road dust.
Status: The Hayden PM10 SIP was submitted to EPA Oct. 16, 1989. It has been deemed complete and has been reviewed by the EPA and given limited approval/disapproval in 1994 (59 FR 36116). Ambient monitoring data reveal that the Hayden area has met the 24-hour and annual PM10 standards for the last several years. The last exceedance of the 24-hour standard occurred in 1997, and the last annual standard exceedance occurred in 1988.
Sulfur Dioxide Nonattainment Area
Emission Sources: Copper smelter stack and fugitive emissions. A second smelter in the area was closed in 1987 and is nonoperational.
Status: In June 2002 ADEQ submitted to EPA the Hayden Sulfur Dioxide Nonattainment Area State Implementation and Maintenance Plan showing attainment of the federal standard was reached and requesting redesignation to attainment. (Not all portions of the document are available electronically. Please contact ADEQ if you need additional information.) Included in the plan are emission limits for smelters as codified in Arizona Administrative Code R18-2-715 and 715.01 .
Miami Area, Gila County
Sulfur Dioxide Nonattainment Area
Emission Sources: Copper smelter stack and fugitive dust emissions.
Status: In June 2002 ADEQ submitted to EPA the Miami Sulfur Dioxide Nonattainment Area State Implementation and Maintenance Plan showing attainment of the federal standard was reached and requesting redesignation to attainment. (Not all portions of the document are available electronically. Please contact ADEQ if you need additional information.) Included in the plan are emission limits for smelters as codified in Arizona Administrative Code R18-2-715 and 715.01 .
Morenci Area, Greenlee County
Sulfur Dioxide Attainment Area with Maintenance Plan (effective June 25, 2004)
Emission Sources: Morenci copper smelter stack and fugitive emissions -smelter dismantled in 1995.
Status: Morenci was first designated as a nonattainment area in 1978. The primary source in Morenci was the Phelps Dodge Morenci, Inc. copper smelter, which was dismantled in 1996. In June 2002, ADEQ submitted to EPA the Morenci Sulfur Dioxide Nonattainment Area State Implementation and Maintenance Plan and request for redesignation to attainment. (Not all portions of the document are available electronically. Please contact ADEQ if you need additional information.) EPA approved the maintenance plan and redesignation in a direct final action (69 FR 22447). Morenci was redesignated to an attainment area with a maintenance plan on June 25, 2004.
Nogales Area, Santa Cruz County
PM10 Nonattainment Area
Emission Sources: Unpaved roads, cleared areas, paved roads and emissions generated in Mexico.
Status: The Nogales PM10 nonattainment area SIP was submitted to EPA June 17, 1993 and demonstrates attainment "but for emissions emanating from outside the United States" (see Section 179B of the Clean Air Act). The plan was determined complete by EPA Nov. 30, 1993; however, EPA has taken no further action on the plan.
Paul Spur Area, Cochise County
PM10 Nonattainment Area
Emission Sources: Stack and fugitive emissions from a lime plant, unpaved roads, and border dragging operations.
Status: In July 1990, ADEQ submitted to EPA the SIP for the Paul Spur PM10 Nonattainment Area. The primary control strategy to reduce PM10 emissions in the Paul Spur area was applying controls to the PM10 emitting units and activities in the lime plant. Other than an exceedance of the 24-hour standard on May 20, 2003, the Paul Spur area has consistently measured PM10 concentrations below both the annual and 24-hour National Ambient Air Quality Standards since at least 1996.
The May 20, 2003, exceedance, however, was principally due to high winds. The meteorological conditions on this day were examined to determine whether the date qualified as a "natural event" under ADEQ's exceptional and natural events policy. The data met all the technical criteria to be considered a natural event. Consequently, a Natural Events Action Plan (NEAP) is being considered for inclusion in a maintenance plan and request for redesignation currently under development for the Paul spur area.
Payson Area, Gila County
PM10 Attainment Area with Maintenance Plan
Emission sources: industrial sources (rock crushers, concrete batch plants, and sawmill), wood smoke, and paved and unpaved roads.
Status: In 1993, EPA designated the Payson area a moderate PM10 nonattainment area. In June 1995, ADEQ submitted to EPA the PM10 State Implementation Plan for the Payson Nonattainment Area. On Feb. 15, 2002, EPA determined that the Payson PM10 Nonattainment Area did attain the 24-hour and annual PM10 National Ambient Air Quality Standards (NAAQS) by the Dec. 31, 2000, Clean Air Act deadline (67 FR 7085
). EPA's determination is based on monitored air quality data for PM10 during the years 1998-2000. In April 2002, ADEQ submitted to EPA the Payson Moderate Area PM10 Maintenance Plan and Request for Redesignation to Attainment. (Not all portions of the document are available electronically. Please contact ADEQ if you need additional information.) EPA approved the maintenance plan and redesignation in a direct final action (67 FR 43013 ). Payson was redesignated to an attainment area with a maintenance plan on Aug. 26, 2002.
Phoenix Area, Maricopa County
On Feb. 7, 1978, Governor Wesley Bolin designated the Maricopa Association of Governments (MAG) as the lead air quality planning organization for the Phoenix Metropolitan area. As the air
quality planning agency, MAG, working with its member governments and agencies, is responsible for Arizona SIP
requirements in the Phoenix Nonattainment areas. Plans produced by MAG are implemented and enforced by state
and local governments in Arizona.
Time Line for Maricopa County nonattainment area SIP - CO, PM10 and Ozone.
PM10 Nonattainment Area
Emission Sources: The primary sources of particulate pollution in the Phoenix area are fugitive dust from unpaved roads, vacant lots, trackout onto paved roads, disturbed areas on mining sites, construction sites, and windblown dust from agricultural fields.
Updated Status: Maricopa County was reclassified as a serious PM10 nonattainment area on June 10, 1996. On July 9, 1999,
the Maricopa Association of Governments (MAG) submitted to EPA
the MAG 1999 Serious Area Particulate Plan for PM10 (Executive Summary ), addressing both the 24-hour and annual standards. Commitments for the metropolitan areas within the nonattainment area are listed in the Appendices of the SIP (Volumes I through IV) and are available upon request. Check the Table of Contents for specific listing.
A revised plan was submitted in February 2000. The Plan, based on New Most Stringent Measures, included an extension request for attainment no later than Dec. 31, 2006. On Jan. 10,
2002, EPA announced the approval of Arizona's plan to attain the standards for PM10 in the metropolitan Phoenix area. EPA also granted a 5-year extension of the attainment date for both the 24-hour and annual PM10 standards from Dec. 31, 2001 to Dec. 31, 2006. Both decisions were published in the Federal Register on July 25, 2002 (67 FR 48718 ).
Additionally, on July 2, 2002, EPA found that more work was needed to achieve attainment of the 24-hour standard in the area of the Salt River monitoring site. For more information on the "Salt River Study Area" see Salt River PM10 State Implementation Plan Revision.
| NEW! 5% Annual Reasonable Further Progress PM10 SIP Revision for Maricopa County and Apache Junction Nonattainment Area
Despite the Most Stringent Measures and Best Available Control Measures (BACMs) adopted and implemented earlier, the nonattainment area failed to attain the NAAQS by the extended deadline of Dec. 31, 2006. This failure triggered a special requirement under Section 189(d) of the Clean Air Act that SIP revisions provide for annual reductions of PM10 or PM10 precursors of not less than 5 percent of the most recent emissions inventory, until the NAAQS is attained, be submitted to EPA by Dec. 31, 2007.
This SIP revision was prepared by the Maricopa Association of Governments and submitted by ADEQ to EPA by the deadline. The SIP revision contains rule revisions (Rules 310, 310.01, and 316 ) to further reduce PM10 emissions as well as five additional Agriculture Best Management Practices (AgBMPs) coupled with an increase in the number of BMPs required per category, and an expanded area to which the BMPs apply.
Senate Bill 1552 addresses the authority to revise the rules and BMPs while also adding requirements for both Maricopa County and areas of Pinal County. Cities and towns in the nonattainment area are to develop and enforce local ordinances to address PM10 contributions from vacant lots, unpaved roads and shoulders, off-road vehicles (OHVs), and leaf blowers. Information on current efforts on the implementation of Senate Bill 1552 can be obtained by contacting Diane Arnst at (602) 771-2375. |
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Natural Events Action Plan (NEAP) for Maricopa County/Salt River PM10 Nonattainment Area
In response to 24-hour PM10 National Ambient Air Quality Standards (NAAQS) exceedances during August and September 2005, a letter explaining procedures in place and future actions to be taken to minimize the potential for further exceedances was developed, underwent public comment and has been submitted to the U.S. Environmental Protection Agency.
NEAP Letter Submitted to U.S. EPA
CO Nonattainment Area
Emission Sources: On-road mobile sources, non-road mobile sources, area sources (e.g. fuel combustion, on-site incineration, open burning, fireplaces and woodstoves).
Status: EPA reclassified Maricopa County as a serious CO nonattainment area on June 10, 1996. The Maricopa Association of Governments (MAG) submitted the required SIP to EPA on July 8, 1999. MAG submitted the Revised MAG 1999 Serious Area Carbon Monoxide Plan (Executive Summary) on April 18, 2001. On October 9, 2001, EPA
determined the Plan complete and on Sept. 22, 2003, found that the Phoenix area has attained the carbon monoxide standards. Approval of the plan is pending.
Ozone Nonattainment Area
Emission Sources: VOC and NOx emissions from point, nonroad, area, stationary, motor vehicle, and biogenic sources.
1-Hour Ozone Nonattainment Area
Status: A portion of Maricopa County was classified as a moderate 1-hour ozone nonattainment area in the early 1990s. EPA reclassified the area as a "serious" ozone nonattainment area on Nov. 16, 1997. ADEQ submitted the Maricopa County Serious Area 1-hour Ozone SIP to EPA in December 2000 to fulfill the attainment demonstration requirements. As there had been no violations of the 1-hour ozone standard since 1996, on May 30, 2001, EPA found that Maricopa County had reached attainment for the 1-hour ozone standard. A maintenance plan and redesignation request developed by MAG was submitted to EPA on April 21, 2004. The One-Hour Ozone Redesignation Request And Maintenance Plan For The Maricopa County Nonattainment Area demonstrates how the Phoenix Metropolitan area will maintain compliance with the 1-hour standard. For additional information regarding the Ozone Maintenance Plan, contact MAG .
Effective June 15, 2004 (see April 30, 2004 Federal Register), the Phoenix area was designated nonattainment for the new more stringent 8-hour ozone standard. The 1-hour standard will be revoked one year following this effective date. However, certain of the control measures developed and implemented for the 1-hour standard are required to remain in place to ensure continued progress toward attainment of the new 8-hour standard.
8-Hour Ozone Nonattainment Area
Status: A portion of eastern Maricopa County and Apache Junction in Pinal County were designated nonattainment for the new 8-hour ozone standard on April 15, 2004. The designation is effective on June 15, 2004. EPA's rule for implementing the new standard requires that the Phoenix nonattainment area meet the standard by 2009. As part of the next steps in the implementation process, state and local agencies will work to develop a program to bring the area into attainment. For more information see Air Quality Plans: 8-Hour Ozone.
Rillito Area, Pima County
PM10 Nonattainment Area
Emission Sources: The major stationary source in the area is Arizona Portland Cement Company. Other sources include construction, unstabilized river banks, agriculture, unpaved roads and unstabilized road shoulders.
Status: The Rillito PM10 State Implementation Plan was submitted to EPA on April 22, 1994.
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San Manuel Area, Pinal County
Sulfur Dioxide Nonattainment Area
Emission Sources: Copper smelter stack and fugitive emissions.
Status: In June 2002 ADEQ submitted to EPA the San Manuel Sulfur Dioxide Nonattainment Area State Implementation and Maintenance Plan showing attainment of the federal standard was reached and requesting redesignation to attainment. (Not all portions of the document are available electronically. Please contact ADEQ if you need additional information.) Included in the plan are emission limits for the smelters as codified in Arizona Administrative Code R18-2-715 and 715.01 .
Tucson Area, Pima County
CO Attainment Area with Maintenance Plan
Emission Sources: Vehicular emissions.
Status: The last violation of the CO National Ambient Air Quality Standard (NAAQS) occurred in 1984. ADEQ
submitted the 1996 Carbon Monoxide Limited Maintenance Plan for the Tucson carbon monoxide nonattainment area to EPA April, 1996, with
revisions submitted in 1999. The area was redesignated to attainment July 10, 2000 with the approval of the maintenance plan (65 FR 36353 ). The
Pima Association of Governments (PAG) has prepared Carbon Monoxide Progress Reports for 2004 - 2005 .
Yuma Area, Yuma County
PM10 Nonattainment Area
Emission Sources: Contributing sources in the Yuma area (Yuma, Yuma County, and the City of Somerton) are agricultural activities, paved and unpaved road dust, and disturbed areas.
Status: The Yuma PM10 State Implementation Plan (SIP) that was submitted to the Environmental Protection Agency (EPA) Nov. 15, 1991 is in the process of being withdrawn by ADEQ. A revision to the PM10 SIP was submitted to EPA on July 12, 1994, and was determined by EPA to be complete but was never approved. ADEQ is also withdrawing this plan. ADEQ began working with stakeholders in the Yuma area in July 2001 to develop a maintenance plan based on data that showed no exceedances of the National Ambient Air Quality Standards (NAAQS) for PM10. On Aug. 18, 2002, however, the Yuma area experienced a violation of the 24-hour NAAQS. This Aug. 18, 2002 exceedance was due to high winds associated with a large thunderstorm. The high wind event data met all the technical criteria to be considered a natural event. Consequently, work on the Yuma Maintenance Plan was temporarily suspended because EPA policy required the development of a Natural Events Action Plan (NEAP) to prevent the area from being downgraded to a serious nonattainment area. The NEAP was developed by the Yuma area stakeholders and ADEQ, and submitted to EPA in February 2004. A NEAP Implementation Report was submitted to EPA on Aug. 17, 2005.
The Yuma area did not have any exceedances of the 24-hour PM NAAQS for the 1998-2000 period. Review of the data for calendar years 1998-2000 also reveals that the Yuma area did not have any exceedances of the annual PM NAAQS. As a consequence, EPA has made a clean data finding for the Yuma area for the 1998-2000 timeframe (see March 14, 2006 Federal Register).
ADEQ has developed a Maintenance Plan for the Yuma area and submitted the Plan to EPA on August 14, 2006. Upon EPA's approval of the Maintenance Plan, EPA will redesignate the Yuma area to attainment for PM10.
More information on these areas:
Information on the San Luis Monitoring Site
Yuma PM10 Maintenance Plan and Technical Support Document, August 2006
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