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and other information incidental to grant administration.

2. Except as may otherwise be provided in the grant agreement, when publications, films, or similar materials are developed directly or indirectly from a project supported by the Environmental Protection Agency, the author is free to arrange for copyright without approval. However, such materials shall include acknowledgement of EPA grant assistance. The grantee agrees to and does hereby grant to the Government, and to its officers, agents, and employees acting within the scope of their official duties, a royaltyfree, nonexclusive, and irrevocable license throughout the world for Government purposes to publish, translate, reproduce, deliver, perform, dispose of, and to authorize other so to do, all Subject Data, or copyrightable material based on such data, now or hereafter covered by copyright.

3. The grantee shall not include in the Subject Data any copyrighted matter, without the written approval of the Grants Officer, unless he provides the Government with the written permission of the copyright owner for the Government to use such copyrighted matter in the manner provided in article 2 above.

4. The grantee shall report to the Grants Officer, promptly and in reasonable written detail, each notice or claim of copyright infringement received by the grantee with respect to all Subject Data delivered under this grant.

5. Nothing contained in this appendix shall imply a license to the Government under any patent or be construed as affecting the scope of any license or other rights otherwise granted to the Government under any patent.

6. Unless otherwise limited below, the Government may, without additional compensation to the grantee, duplicate, use, and disclose in any manner and for any purpose whatsoever, and have others so do, all Subject Data delivered under this contract.

7. Notwithstanding any provisions of this grant concerning inspection and acceptance, the Government shall have the right at any time to modify, remove, obliterate, or ignore any marking not authorized by the terms of this grant on any piece of Subject Data furnished under this grant.

8. Data need not be furnished for standard commercial items or services which are normally or have been sold or offered to the public commercially by any supplier and which are incorporated as component parts in or to be used with the product or process being developed or investigated, if in lieu thereof identification of source and characteristics (including performance specifications, when necessary) sufficient to enable the Government to procure the part or an adequate substitute, are furnished; and further, proprietary data need not be furnished for other items or processes which were developed at private expense and previously sold or offered for sale or commercially practiced in the case of a process, including minor modifications thereof, which are incorporated as component parts in or to be used with the product or process being developed or investigated, if in lieu thereof the grantee shall identify such other items or processes and that "proprietary data" pertaining thereto which is necessary to enable reproduction or manufacture of the item or performance of the process. For the purpose of this clause, 'proprietary data" means data providing information concerning the details of a grantee's secrets of manufacture, such as may be contained in but not limited to his manufacturing methods or processes, treatment and chemical composition of materials, plant layout and tooling, to the extent that such information is not readily disclosed by inspection or analysis of the product itself and to the extent that the grantee has protected such information from unrestricted use by others.

[36 F.R. 22728, Nov. 27, 1971]

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Appendix A-Reference Method for the Determination of Sulfur Dioxide in the Atmosphere (Pararosaniline Method). Appendix B-Reference Method for the Determination of Suspended Particulates in the Atmosphere (High Volume Method). Appendix C-Reference Method for the Continuous Measurement of Carbon Monoxide in the Atmosphere (Nondispersive Infrared Spectrometry). Appendix D-Reference Method for the Measurement of Photochemical Oxidants Corrected for Interferences Due to Nitrogen Oxide and Sulfur Dioxide. Appendix E-Reference Method for the Determination of Hydrocarbons Corrected for Methane. Appendix F-Reference Method for the Determination of Nitrogen Dioxide (24-Hour Sampling Method).

AUTHORITY: The provisions of this Part 50 issued under sec. 4, Public Law 91-604, 84 Stat. 1679.

SOURCE: The provisions of this Part 50 appear at 36 F.R. 22884, Nov. 25, 1971, unless otherwise noted.

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are necessary, with an adequate margin of safety, to protect the public health. National secondary ambient air quality standards define levels of air quality which the Administrator judges necessary to protect the public welfare from any known or anticipated adverse effects of a pollutant. Such standards are subject to revision, and additional primary and secondary standards may be promulgated as the Administrator deems necessary to protect the public health and welfare.

(c) The promulgation of national primary and secondary ambient air quality standards shall not be considered in any manner to allow significant deterioration of existing air quality in any portion of any State.

(d) The proposal, promulgation, or revision of national primary and secondary ambient air quality standards shall not prohibit any State from establishing ambient air quality standards for that State or any portion thereof which are more stringent than the national standards.

§ 50.3 Reference conditions.

All measurements of air quality are corrected to a reference temperature of 25° C. and to a reference pressure of 760 millimeters of mercury (1,013.2 millibars).

§ 50.4 National primary ambient airquality standards for sulfur oxides (sulfur dioxide).

The national primary ambient air quality standards for sulfur oxides, measured as sulfur dioxide by the reference method described in Appendix A to this part, or by an equivalent method,

are:

(a) 80 micrograms per cubic meter (0.03 p.p.m.)-annual arithmetic mean.

(b) 365 micrograms per cubic meter (0.14 p.p.m.)-Maximum 24-hour concentration not to be exceeded more than once per year.

§ 50.5 National secondary ambient airquality standards for sulfur oxides (sulfur dioxide).

The national secondary ambient air quality standards for sulfur oxides, measured as sulfur dioxide by the reference method described in Appendix A to this part, or by an equivalent method,

are:

(a) 60 micrograms per cubic meter (0.02 p.p.m.)—annual arithmetic mean.

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The national secondary ambient air quality standards for particulate matter, measured by the reference method described in Appendix B to this part, or by an equivalent method, are:

(a) 60 micrograms per cubic meterannual geometric mean, as a guide to be used in assessing implementation plans to achieve the 24-hour standard.

(b) 150 micrograms per cubic metermaximum 24-hour concentration not to be exceeded more than once per year. § 50.8 National primary and secondary ambient air quality standards for carbon monoxide.

The national primary and secondary ambient air quality standards for carbon monoxide, measured by the reference method described in Appendix C to this part, or by an equivalent method, are:

(a) 10 milligrams per cubic meter (9 p.p.m.)-maximum 8-hour concentration not to be exceeded more than once per year.

(b) 40 milligrams per cubic meter (35 p.p.m.)-maximum 1-hour concentration not to be exceeded more than once per year.

§ 50.9 National primary and secondary ambient air quality standards for photochemical oxidants.

The national primary and secondary ambient air quality standard for photo

chemical oxidants, measured and corrected for interferences due to nitrogen oxides and sulfur dioxide by the reference method described in Appendix D to this part, or by an equivalent method, is: 160 micrograms per cubic meter (0.08 p.p.m.)-maximum 1-hour concentration not to be exceeded more than once per year.

§ 50.10 National primary and secondary ambient air quality standard for hydrocarbons.

The hydrocarbons standard is for use as a guide in devising implementation plans to achieve oxidant standards.

The national primary and secondary ambient air quality standard for hydrocarbons, measured and corrected for methane by the reference method described in Appendix E to this part, or by an equivalent method, is: 160 micrograms per cubic meter (0.24 p.p.m.)-maximum 3-hour concentration (6 to 9 a.m.) not to be exceeded more than once per year. § 50.11

National primary and secondary ambient air quality standard for nitrogen dioxide.

The national primary and secondary ambient air quality standard for nitrogen dioxide, measured by the reference method described in Appendix F to this part, or by an equivalent method, is: 100 micrograms per cubic meter (0.05 p.p.m.)-annual arithmetic mean. APPENDIX A-REFERENCE METHOD FOR THE DETERMINATION OF SULFUR DIOXIDE IN THE ATMOSPHERE (PARAROSANILINE METHOD)

1. Principle and Applicability. 1.1 Sulfur dioxide is absorbed from air in a solution of potassium tetrachloromercurate (TCM). A dichlorosulfitomercurate complex, which resists oxidation by the oxygen in the air, is formed (1, 2). Once formed, this complex is stable to strong oxidants (e.g., ozone, oxides of nitrogen). The complex is reacted with pararosaniline and formaldehyde to form intensely colored pararosaniline methyl sulfonic acid (3). The absorbance of the solution is measured spectrophotometrically.

1.2 The method is applicable to the measurement of sulfur dioxide in ambient air using sampling periods up to 24 hours.

2. Range and Sensitivity. 2.1 Concentrations of sulfur dioxide in the range of 25 to 1,050 μg/m.3 (0.01 to 0.40 p.p.m.) can be measured under the conditions given. One can measure concentrations below 25 μg./m.3 by sampling larger volumes of air, but only if the absorption efficiency of the particular system is first determined. Higher concentrations can be analyzed by using smaller gas samples, a larger collection volume, or a suitable aliquot of the collected sample. Beer's

Appendix A-Reference Method for the De

termination of Sulfur Dioxide in the Atmosphere (Pararosaniline Method).

Appendix B-Reference Method for the Determination of Suspended Particulates in the Atmosphere (High Volume Method). Appendix C-Reference Method for the Continuous Measurement of Carbon Monoxide in the Atmosphere (Nondispersive Infrared Spectrometry). Appendix D-Reference Method for the Photochemical Measurement of

Oxidants Corrected for Interferences Due to Nitrogen Oxide and Sulfur Dioxide. Appendix E-Reference Method for the Determination of Hydrocarbons Corrected for Methane. Appendix F-Reference Method for the Determination of Nitrogen Dioxide (24-Hour Sampling Method).

AUTHORITY: The provisions of this Part 50 issued under sec. 4, Public Law 91-604, 84 Stat. 1679.

SOURCE: The provisions of this Part 50 appear at 36 F.R. 22384, Nov. 25, 1971, unless otherwise noted.

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(a) As used in this part, all terms not defined herein shall have the meaning given them by the Act.

(b) "Act" means the Clean Air Act, as amended (42 U.S.C. 1857-18571, as amended by Pub. L. 91–604).

(c) "Agency" means the Environmental Protection Agency.

(d) "Administrator" means the Administrator of the Environmental Protection Agency.

(e) "Ambient air" means that portion of the atmosphere, external to buildings, to which the general public has access. (f) "Reference method" means method of sampling and analyzing for an air pollutant, as described in an appendix to this part.

(g) "Equivalent method" means any method of sampling and analyzing for an air pollutant which can be demonstrated to the Administrator's satisfaction to have a consistent relationship to the reference method.

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are necessary, with an adequate margin of safety, to protect the public health. National secondary ambient air quality standards define levels of air quality which the Administrator judges necessary to protect the public welfare from any known or anticipated adverse effects of a pollutant. Such standards are subject to revision, and additional primary and secondary standards may be promulgated as the Administrator deems necessary to protect the public health and welfare.

(c) The promulgation of national primary and secondary ambient air quality standards shall not be considered in any manner to allow significant deterioration of existing air quality in any portion of any State.

(d) The proposal, promulgation, or revision of national primary and secondary ambient air quality standards shall not prohibit any State from establishing ambient air quality standards for that State or any portion thereof which are more stringent than the national standards.

§ 50.3 Reference conditions.

All measurements of air quality are corrected to a reference temperature of 25° C. and to a reference pressure of 760 millimeters of mercury (1,013.2 millibars).

§ 50.4 National primary ambient airquality standards for sulfur oxides (sulfur dioxide).

The national primary ambient air quality standards for sulfur oxides, measured as sulfur dioxide by the reference method described in Appendix A to this part, or by an equivalent method,

are:

(a) 80 micrograms per cubic meter (0.03 p.p.m.)-annual arithmetic mean.

(b) 365 micrograms per cubic meter (0.14 p.p.m.)-Maximum 24-hour concentration not to be exceeded more than once per year.

§ 50.5 National secondary ambient airquality standards for sulfur oxides (sulfur dioxide).

The national secondary ambient air quality standards for sulfur oxides, measured as sulfur dioxide by the reference method described in Appendix A to this part, or by an equivalent method,

are:

(a) 60 micrograms per cubic meter (0.02 p.p.m.)-annual arithmetic mean.

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The national secondary ambient air quality standards for particulate matter, measured by the reference method described in Appendix B to this part, or by an equivalent method, are:

(a) 60 micrograms per cubic meter— annual geometric mean, as a guide to be used in assessing implementation plans to achieve the 24-hour standard.

(b) 150 micrograms per cubic metermaximum 24-hour concentration not to be exceeded more than once per year. § 50.8 National primary and secondary ambient air quality standards for carbon monoxide.

The national primary and secondary ambient air quality standards for carbon monoxide, measured by the reference method described in Appendix C to this part, or by an equivalent method, are:

(a) 10 milligrams per cubic meter (9 p.p.m.)—maximum 8-hour concentration not to be exceeded more than once per year.

(b) 40 milligrams per cubic meter (35 p.p.m.)-maximum 1-hour concentration not to be exceeded more than once per year.

§ 50.9 National primary and secondary ambient air quality standards for photochemical oxidants.

The national primary and secondary ambient air quality standard for photo

chemical oxidants, measured and corrected for interferences due to nitrogen oxides and sulfur dioxide by the reference method described in Appendix D to this part, or by an equivalent method, is: 160 micrograms per cubic meter (0.08 p.p.m.)-maximum 1-hour concentration not to be exceeded more than once per year.

§ 50.10 National primary and secondary ambient air quality standard for hydrocarbons.

The hydrocarbons standard is for use as a guide in devising implementation plans to achieve oxidant standards.

The national primary and secondary ambient air quality standard for hydrocarbons, measured and corrected for methane by the reference method described in Appendix E to this part, or by an equivalent method, is: 160 micrograms per cubic meter (0.24 p.p.m.)—maximum 3-hour concentration (6 to 9 a.m.) not to be exceeded more than once per year. § 50.11

National primary and secondary ambient air quality standard for nitrogen dioxide.

The national primary and secondary ambient air quality standard for nitrogen dioxide, measured by the reference method described in Appendix F to this part, or by an equivalent method, is: 100 micrograms per cubic meter (0.05 p.p.m.)-annual arithmetic mean. APPENDIX A-REFERENCE METHOD FOR THE DETERMINATION OF SULFUR DIOXIDE IN THE ATMOSPHERE (PARAROSANILINE METHOD)

1. Principle and Applicability. 1.1 Sulfur dioxide is absorbed from air in a solution of potassium tetrachloromercurate (TCM). A dichlorosulfitomercurate complex, which resists oxidation by the oxygen in the air, is formed (1, 2). Once formed, this complex is stable to strong oxidants (e.g., ozone, oxides of nitrogen). The complex is reacted with pararosaniline and formaldehyde to form intensely colored pararosaniline methyl sulfonic acid (3). The absorbance of the solution is measured spectrophotometrically.

1.2 The method is applicable to the measurement of sulfur dioxide in ambient air using sampling periods up to 24 hours.

2. Range and Sensitivity. 2.1 Concentrations of sulfur dioxide in the range of 25 to 1,050 μg/m.3 (0.01 to 0.40 p.p.m.) can be measured under the conditions given. One can measure concentrations below 25 μg./m." by sampling larger volumes of air, but only if the absorption efficiency of the particular system is first determined. Higher concentrations can be analyzed by using smaller gas samples, a larger collection volume, or a suitable aliquot of the collected sample. Beer's

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