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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: A Clean Data Finding was issued by EPA for 2002-2004 on Feb. 8, 2006 (71 FR 6352), effective April 10, 2006. ADEQ is currently developing an attainment demonstration, 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: 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 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. Annual reports are submitted to EPA by June 30th of each year and are available upon request.
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: In a 1990 clarification, the Douglas-Paul Spur Group I Area was specified to include all or part of eight contiguous townships in and around the City of Douglas and the Paul Spur unincorporated area. Consistent with EPA's PM10 grouping scheme, the Douglas-Paul Spur Group I Area was designated and classified as a moderate PM10 nonattainment area upon enactment of the 1990 Clean Air Act (CAA) amendments. ADEQ is currently developing a maintenance plan and request for redesignation for the Douglas-Paul Spur PM10 Nonattainment Area.
Sulfur Dioxide Attainment Area with Maintenance Plan
Emission Sources: Douglas copper smelter stack and fugitive emissions -smelter dismantled in early 1987.
Status: ADEQ submitted the Douglas Sulfur Dioxide Nonattainment Area State Implementation and Maintenance Plan and Request for Redesignation to Attainment to EPA on Dec. 18, 2001. EPA approved the SIP on Feb. 28, 2006 (71 FR 9941), effective May 1, 2006.
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 . EPA action is pending.
Miami Area, Gila County
PM10 Nonattainment Area
Status: On March 28, 2007, EPA concurred with ADEQ's request to split the Hayden/Miami Nonattainment Area into two separate nonattainment areas. In the same rule, EPA determined that the Miami Nonattainment Area met the PM10 standards and qualified for redesignation to attainment. On July 25, 2008 ADEQ submitted to EPA the Miami Moderate Area PM10 Limited Maintenance Plan and Request for Redesignation to Attainment. EPA action is pending.
Sulfur Dioxide Attainment Area with Maintenance Plan
Emission Sources: Copper smelter stack and fugitive dust emissions.
Status: On June 27, 2002, ADEQ submitted to EPA the Miami Sulfur Dioxide Nonattainment Area State Implementation and Maintenance Plan. EPA approved the plan on Jan. 24, 2007 (72 FR 3061), effective March 26, 2007.
Morenci Area, Greenlee County
Sulfur Dioxide Attainment Area with Maintenance Plan
Emission Sources: Morenci copper smelter stack and fugitive emissions -smelter dismantled in 1995.
Status: on June 21, 2002, ADEQ submitted to EPA the Morenci Sulfur Dioxide Nonattainment Area State Implementation and Maintenance Plan and request for redesignation to attainment. EPA approved the plan in a direct final action (69 FR 22447 ), effective 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 (see Douglas)
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: On March 29, 2002, ADEQ submitted to EPA the Payson Moderate Area PM10 Maintenance Plan and Request for Redesignation to Attainment. 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. Annual reports are submitted to EPA by June 30th of each year and are available upon request.
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 Attainment Area with Maintenance Plan
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.
In May 2003, MAG submitted to ADEQ the Carbon Monoxide Redesignation Request and Maintenance Plan for the Maricopa County Nonattainment Area . This plan was approved by EPA in March 2005 (70 FR 11553; March 9, 2005 ). A correction to the redesignation was published in the Federal Register in September 2005 (70 FR 52926; September 6, 2005 ).
Ozone Nonattainment Area
Emission Sources: VOC and NOx emissions from point, nonroad, area, stationary, motor vehicle, and biogenic sources.
1-Hour Ozone Attainment Area with Maintenance Plan
Status: A portion of eastern Maricopa County was designated and classified as a "moderate" 1-hour ozone nonattainment area in the early 1990s (56 FR 56694; Nov. 6, 1991). EPA reclassified the area as a "serious" ozone nonattainment area effective Dec. 8, 1997 (62 FR 60001; Nov. 6, 1997). EPA approved the MAG One-Hour Ozone Redesignation Request and Maintenance Plan for the Maricopa County Nonattainment Area, March 2004 , and redesignated the area to attainment effective June 14, 2005 (70 FR 34362 ; June 14, 2005).
8-Hour Ozone Nonattainment Area (1997 standard)
Status: A portion of eastern Maricopa County and Apache Junction in Pinal County were designated nonattainment for the 1997 8-hour ozone standard effective June 15, 2004 (69 FR 23858 ; April 30, 2004). The MAG Eight-Hour Ozone Plan for the Maricopa County Area, June 2007 , which demonstrates how the area will attain the standard, was submitted to EPA on June 13, 2007. EPA action is pending.
MAG developed and submitted to ADEQ the MAG Eight-Hour Ozone Redesignation Request and Maintenance Plan for the Maricopa Nonattainment Area in February 2009. For additional information regarding the 8-hour ozone maintenance plan for the 1997 standard, contact MAG . EPA action is pending.
8-Hour Ozone (2008 standard)
On May 27, 2008, EPA strengthened the air quality standards for ground-level ozone to improve public health protection (73 FR 16436 ; March 27, 2008). Recommendations from States regarding which areas do or do not meet the new standards were due to EPA March 12, 2009. See the 8-Hour Ozone page for details regarding ADEQ's boundary recommendations.
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: On Oct. 10, 2006, EPA determined the Rillito Nonattainment Area had met the PM10 standard and qualified for redesignation to attainment. On July 10, 2008, ADEQ submitted the Rillito Moderate Area PM10 Limited Maintenance Plan and Request for Resignation to Attainment.
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San Manuel Area, Pinal County
Sulfur Dioxide Attainment Area with Maintenance Plan
Emission Sources: Copper smelter stack and fugitive emissions.
Status: The San Manuel smelter permits were cancelled in March 2005. On June 7, 2007, ADEQ submitted an update to the San Manuel Sulfur Dioxide Nonattainment Area State Implementation and Maintenance Plan. The resignation and maintenance plan was approved by EPA on Jan. 18, 2008 (73 FR 3396 ), effective March 18, 2008.
Tucson Area, Pima County
CO Attainment Area with Maintenance Plan
Emission Sources: Vehicular emissions.
Status: The Carbon Monoxide (CO) Limited Maintenance Plan (LMP) developed by the Pima Association of Governments (PAG) for the Tucson Air Planning Area (TAPA) was submitted by ADEQ to EPA in 1996 and updated in 1997. The TAPA was designated to CO attainment status by EPA, effective July 10, 2000. EPA's LMP option required a revision for the remaining ten-year period of the LMP, 2010-2020. The 2008 Revision to the Carbon Monoxide Limited Maintenance Plan For the Tucson Air Planning Area, developed by PAG, was submitted by ADEQ to EPA by July 10, 2008.
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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