Louisiana Administrative Code › Title 33 - ENVIRONMENTAL QUALITY › Part III - Air › Chapter 7 - Ambient Air Quality › Section III-711 - Tables 1, 1a, 2- Air Quality

Current through Register Vol. 50, No. 6, June 20, 2024
A.
				Table 1. Primary Ambient Air Quality Standards
Table 1. Primary Ambient Air Quality
							 Standards
Air Contaminant
Maximum Permissible Concentration
PM10
150 [MICRO]g/m3
(Maximum 24-hour concentration not to be exceeded
							 more than once per year averaged over a three-year period)
PM2.5
12 [MICRO]g/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
							 [MICRO]g/m3.
35 [MICRO]g/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 [MICRO]g/m3
or 9 ppm (Maximum 8-hour concentration not to be
							 exceeded more than once per year)
40,000 [MICRO]g/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.
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 [MICRO]g/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 [MICRO]g/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 A
				dministrator of the Environmental Protection Agency judges to be necessary,
				with an adequate margin of safety, to protect the public health.