SBCT Final EIS - Govsupport.us

Chapter 3 ⎯ Affected EnvironmentFederal air quality management programs for hazardous air pollutants focus on setting emission limitsfor particular industrial processes rather than setting ambient exposure standards. Some states haveestablished ambient exposure guidelines for various hazardous air pollutants and use those guidelinesas part of the permit review process for industrial emission sources.Hawaii has established significant ambient air concentration thresholds and criteria for hazardous airpollutants (Hawaii Administrative Rules Title 11 Chapter 60.1, Section 179). These are applied underthe permit review process for emission sources that require state or federal air quality permits. Thesethresholds and criteria include the following:Table 3-1 State and National Ambient Air Quality Standards Applicable in HawaiiPollutant Averaging Times State StandardsFederalStandards UnitsCO1-hour9 35 ppm10,000 40,000 µg/m³8-hour4.4 9 ppm5,000 10,000 µg/m³NO 2Annual (Arith. Mean)0.04 0.053 ppm70 100 µg/m³SO 23-hour0.5 0.5 ppm1,300 1,300 µg/m³24-hour0.14 0.14 ppm365 365 µg/m³Annual (Arith. Mean)0.03 0.03 ppm80 80 µg/m³Ozone 1-hour - 0.12 ppm8-hour0.08 0.08 ppm157 157 µg/m³PM 1024-hour 150 150 µg/m³Annual (Arith. Mean) 50 Revoked µg/m³Lead Quarterly Average 1.5 1.5 µg/m³Hydrogen 1-hour0.025 - ppmSulfide35 - µg/m³PM 2.5 24-hour - 35 µg/m³Annual (Arith. Mean) - 15 µg/m³Source: Hawaii Department of Health (HDOH) 2007Notes:All standards except the national PM 10 and PM 2.5 standards are based on measurements corrected to 25 degrees Celsius ©and 1 atmosphere pressure.The national PM 10 and PM 2.5 standards are based on direct flow volume data without correction to standard temperatureand pressure.The “10” in PM 10 and the “2.5” in PM 2.5 are not particle size limits; these numbers identify the particle size class (aerodynamicdiameter in microns) collected with 50% mass efficiency by certified sampling equipment. The maximum particlesize collected by PM 10 samplers is about 50 microns. The maximum particle size collected by PM 2.5 samplers is about6 microns.ppm = parts per millionμg/m 3 = micrograms per cubic meterFebruary 2008 3–78 2/25th SBCT Final EIS