LAC 33:III.711. Tables 1, 1a, 2―Air Quality

A. Table 1. Primary Ambient Air Quality Standards Table 1. Primary Ambient Air Quality Standards Air Contaminant | Maximum Permissible Concentration PM10 | 150 μg/m3 | (Maximum 24-hour concentration not to be exceeded more than once per year averaged over a three-year period) PM2.5 | 12 μg/m3 | (Annual arithmetic mean, averaged over 3 years) The standard is met when the annual arithmetic mean concentration, as determined in accordance with appendix N of 40 CFR Part 50 is less than or equal to 12 μg/m3. PM2.5 | 35 μg/m3 | (24-hour, averaged over 3 years) The standard is met when the 98th percentile 24-hour concentration, as determined in accordance with Appendix N of 40 CFR Part 50 is less than or equal to 35 ug/m3. Sulfur Dioxide (SO2) | 75 ppb daily maximum 1-hour concentration | The standard is met at an ambient air monitoring site when the 3-year average of the annual 99th percentile of the daily maximum 1-hour average concentration is less than or equal to 75 ppb, as determined in accordance with 40 CFR Part 50 appendix T. Carbon Monoxide (CO) | 10,000 μg/m3 | or 9 ppm (Maximum 8-hour concentration not to be exceeded more than once per year) Carbon Monoxide (CO) | 40,000 μg/m3 | or 35 ppm (Maximum 1-hour concentration not to be exceeded more than once per year) Ozone | 0.075 ppm daily maximum 8-hour average | The standard is met at an ambient air monitoring site when the 3-year average of the annual fourth highest daily maximum 8-hour average ozone concentrations is less than or equal to 0.075 ppm, as determined in accordance with 40 CFR Part 50, appendix P. Nitrogen Dioxide (NO2) | 53 ppb | (Annual arithmetic mean) The Standard is met when the annual arithmetic mean is less than or equal to 53 ppb, as determined in accordance with 40 CFR Part 50, appendix S. Nitrogen Dioxide (NO2) | 100 ppb | (1-hour average concentration) The standard is met when the 3-year average of the annual 98th percentile of the daily maximum 1-hour average concentration is less than or equal to 100 ppb, as determined in accordance with 40 CFR Part 50, appendix S. Lead | 0.15 μg/m3 | (3-month rolling average) (The standard is met when the maximum arithmetic 3-month mean concentration for a 3-year period, as determined in accordance with appendix R of 40 CFR Part 50 is less than or equal to 0.15 μg/m3. 1. The contribution of any contaminant by a single source property shall be measured as the difference between the upwind level and the downwind level for the property, using methods approved by the administrative authority, or by the use of suitable engineering techniques such as source dispersion calculations. 2. National primary ambient air quality standards define levels of air quality that the Administrator of the Environmental Protection Agency judges to be necessary, with an adequate margin of safety, to protect the public health. B. Table 1a. Secondary Ambient Air Quality Standards Table 1a. Secondary Ambient Air Quality Standards Air Contaminant | Maximum Permissible Concentration PM10 | 150 μg/m3 | (Maximum 24-hour concentration not to be exceeded more than once per year averaged over a three-year period) Sulfur Dioxide (SO2) | 0.5 ppm | (3-hour average concentration not to be exceeded more than once per year) PM2.5 | 15.0 μg/m3 | (Annual arithmetic mean, averaged over 3 years) The standard is met when the annual arithmetic mean concentration, as determined in accordance with appendix N of 40 CFR Part 50 is less than or equal to 15 μg/m3. PM2.5 | 35 μg/m3 | (24-hour, averaged over 3 years) The standard is met when the 98th percentile 24-hour concentration, as determined in accordance with appendix N of 40 CFR Part 50 is less than or equal to 35 μg/m3. Carbon Monoxide (CO) | 10,000 μg/m3 | or 9 ppm (Maximum 8-hour concentration not to be exceeded more than once per year) Carbon Monoxide (CO) | 40,000 μg/m3 | or 35 ppm (Maximum 1-hour concentration not to be exceeded more than once per year) Ozone | 0.075 ppm daily maximum 8-hour average | The standard is met at an ambient air monitoring site when the 3-year average of the annual fourth highest daily maximum 8-hour average ozone concentrations is less than or equal to 0.075 ppm, as determined in accordance with 40 CFR Part 50, appendix P. Nitrogen Dioxide (NO2) | 100 μg/m3 | (0.053 ppm) (Annual arithmetic mean ) The Standard is met when the annual arithmetic mean concentration in a calendar year is less than or equal to 0.053 ppm. Lead | 0.15 μg/m3 | (3-month rolling average) (The standard is met when the maximum arithmetic 3-month mean concentration for a 3-year period, as determined in accordance with appendix R of 40 CFR Part 50 is less than 0.15 μg/m3. 1. The contribution of any contaminant by a single source property shall be measured as the difference between the upwind level and the downwind level for the property, using methods approved by the administrative authority, or by the use of suitable engineering techniques such as source-dispersion calculations. 2. National secondary ambient air quality standards define levels of air quality that the Administrator of the Environmental Protection Agency judges to be necessary to protect the public welfare from any known or anticipated adverse effects of a pollutant. C. Table 2. Ambient AirMethods of Contaminant Measurement Table 2. Ambient Air—Methods of Contaminant Measurement Air Contaminant | Sampling Interval | Analytical Method PM10 | 24 hours | Reference method based on appendix J to 40 CFR 50 and designated in accordance with 40 CFR 53, or an equivalent method designated in accordance with 40 CFR 53. PM2.5 | 24 hours | Reference method based on appendix L to 40 CFR Part 50 and designated in accordance with 40 CFR Part 53 or an equivalent method designated in accordance with 40 CFR Part 53. Sulfur Dioxide | 24 hours | Reference method based on appendix A-1 or A-2 to 40 CFR Part 50 or an equivalent method designated in accordance with 40 CFR Part 53. Sulfur Dioxide | Continuous | Reference method based on appendix A-1 or A-2 to 40 CFR Part 50 or an equivalent method designated in accordance with 40 CFR Part 53. Total Oxidants | Continuous | Reference method based on appendix D to 40 CFR Part 50 and designated in accordance with 40 CFR Part 53 or an equivalent method designated in accordance with 40 CFR Part 53. Carbon Monoxide | Continuous | Any method complying with reference or equivalent methods in Title 40, Code of Federal Regulations, Part 50, appendix C, and Part 53, Subpart B. Nitrogen Dioxide | 24 hours | Reference method based on appendix F to 40 CFR Part 50 or an equivalent method designated in accordance with 40 CFR Part 53. Lead | 24 hours | Reference method based on appendix G to 40 CFR Part 50 or an equivalent method designated in accordance with 40 CFR Part 53.