AIR POLLUTION- PM10 & PM2.5 1987 Clean Air Act sets forth National Ambient Air Quality Standard for PM10. November, 1990 San Joaquin Valley classified as "moderate" non-attainment for PM10. November, 1991 SJVUAPCD adopts "moderate" non-attainment plan, which requires all Reasonably Available Control Measures (RACM) to be adopted. This plan sets forth proposed control measures to reduce fugitive dust emissions from activities such as unpaved roads, landfills, storage piles, and parking lots. February, 1993 EPA reclassifies San Joaquin Valley as "serious" non-attainment. October, 1993 San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) adopts Regulation VIII - Control of Fugitive Dust (PM10). November, 1994 SJVUAPCD adopts serious non-attainment plan, which requires all Best Available Control Measures (BACM) to be adopted. This plan requires the District to develop Resource Conservation Plans (RCPs), in consultation with the Soil Conservation Service (SCS) and the agricultural industry, that are intended to reduce emissions from agricultural operations, such as harvesting and tillage. June, 1996 SJVUAPCD, CDFA, and USDA-NRCS sign MOU to address air quality and agriculture in the San Joaquin Valley. May, 1997 SJVUAPCD adopts Attainment Demonstration Plan. Plan indicates that Air Basin will not be in attainment by December 31, 2001. Provides basis for requesting 5 year extension to December 31, 2006. Plan lays out detailed research plan and time line for agricultural operations. June, 1997 EPA promulgates new PM2.5 ambient air quality standard. Feb, 1998 USDA and EPA sign MOU to address air quality and agriculture on a national basis. KEY ISSUES RCPs Industry must play role in development of RCPs to ensure workable and economically feasible rules. NRCS Agricultural Air Quality Task force is working on concept for voluntary compliance. New Ambient Air Quality Standards EPA promulgated new ambient air quality standards for PM2.5. These new standards will address growing concerns of fine particulate matter and its potential for significant health effects. Particulate of PM2.5 size are generally of an organic aerosol nature, such as ammonium nitrate or ammonium sulfate, but may also include soot from combustion sources likes automobiles and fireplaces. California Regional Particulate Matter Air Quality Study (CRPMAQS) Agricultural industry must continue to participate in this study to ensure that actual credible science is developed. This will become paramount in the development of RCPs. Activities include actual measurements of PM10 and PM2.5 emissions from agricultural harvesting and land preparation operations. Also, NOx & NH3 emissions measurements from dairies, feed lots, and soils will be conducted. State Ambient Air Quality Standard Only federal requirements have been addressed so far. California PM10 standards are much more stringent, and requirements to achieve state standards have not yet been promulgated.

AMBIENT AIR QUALITY STANDARDS PM10                    24 HR           ANNUAL FEDERAL    150 µg/m3    50 µg/m3  STATE          50 µg/m3   30 µg PM2.5                     24 HR         ANNUAL FEDERAL     65 µg/m3    15 µg/m3