NEBRASKA ADMINISTRATIVE CODE

Title 129

- Department of Environmental Quality

Chapter 4

- AMBIENT AIR QUALITY STANDARDS

4

- 1 The following ambient air quality standards are applicable in the State of Nebraska:

001 Particulate Matter

001.01 PM 10 – Primary and secondary standards

Level: 150 micrograms per cubic meter

Averaging t ime: 24

- hour s

Form: N ot to be exceeded more than once per year on average over 3

years

(Attainment of these standards is determined in accordance with

Appendix K of 40 CFR Part 50 (version July 1, 201 3 ); which is adopted

and incorporated herein)

001.02 PM 2.5

001.02A Primary s tandard

Level: 12.0 micrograms per cubic meter

Averaging time: Annual

Form: Annual mean averaged over 3 years

001.02B Secondary standard

Level: 1 5 .0 micrograms per cubic meter

Averaging time: Annual

Form: Annual mean averaged over 3 years

001.02C Primary and secondary standard

Level: 35 micrograms per cubic meter

Averaging time: 24

- hour

Form: 98th percentile averaged over 3 yearsTitle 129

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(Attainment of these standards is determined in accordance with

Appendix N of 40 CFR Part 50 (version July 1, 201 3 ); which is adopted

and incorporated herein)

002 Sulfur dioxide

002.01 Primary standard

Level: 75 parts per billion

Averaging time: 1

- hour

Form: 99 th percentile of 1

- hour daily maximum concentrations averaged

over 3 years

002.02 Secondary standard

Level: 0.5 parts per million

Averaging time: 3

- hour s

Form: N ot to be exceeded more than once a year

(Attainment of this standard is determined in accordance with Appendix T

of 40 CFR Part 50 (version July 1, 201 3 ) ; which is adopted and

incorporated herein)

003 Nitrogen dioxide

003.01 Primary standard

Level: 100 parts per billion

Averaging time: 1

- hour

Form: 98 th percentile averaged over 3 years

003.02 Primary and secondary standards

Level: 53 parts per billion

Averaging time: Annual

Form: Annual mean

(Attainment of this standard is determine d in accordance with Appendix S

of 40 CFR Part 50 (version July 1, 201 3 ) ; which is adopted and

incorporated herein)

004 Carbon monoxide

– Primary standards

Level: 9 parts per millionTitle 129

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- 3

Averaging time: 8

- hours

Form: N ot to be exceeded more than once per year

Level: 35 parts per million

Averaging time: 1

- hour

Form: N ot to be exceeded more than once per year

(Attainment of this standard is determine d in accordance with 40 CFR

50.8. (version July 1, 201 3 ) ; which is adopted and incorporated herein)

005 Ozone

– Primary and secondary standards

Level: 0. 075 parts per million (0.0 75 ppm)

Averaging time: 8

- hour

Form: Annual fourth

- highest daily maximum 8

- hour concentration

averaged over 3 years

(Attainment of this standard is determined in accordance with Appendix P

of 40 CFR Part 50 (Version July 1, 201 3 ) ; which is adopted and

incorporated herein)

006 Lead

– Primary and secondary standard

Level: 0.15 micrograms per cubic meter

Averaging time: R olling three

- month average

Form: Not to be exceeded

(Attainment of this standard is determined in accordance with Appendix R

of 40 CFR Part 50 (Version July 1, 201 3 ) ; which is adopted and

incorporated herein)

007 Total reduced sulfur

Level: 10.0 parts per million (10.0 ppm)

Averaging time: 1 minute

Form: M aximum average concentration

Level: 0.10 parts per million (0.10 ppm)

Averaging time: 30

- minutes

Form: M aximum rolling average

007.01 Except as provided in 007.01A and 007.01B these standards apply only

where human exposure occurs.Title 129

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007.01A Ambient concentrations of total reduced sulfur (TRS) emissions

occurring as a result of natural activities that have no associated economic

benefits, such as seasonal stratification or turnover of lakes and lagoons, and

the release of water uncontaminated by process or industrial activity from

lakes, reservoirs, lagoons and water impoundment systems shall not

constitute violation of the standards contained in section 007

.

007.01B The Department shall provid e reasonable opportunity for any

owner or operator of any source causing or contributing to a violation of the

standards in 007 to develop and implement a program to eliminate such

violations prior to taking enforcement action.

007.02 Unless otherwise approved by the Director, the levels of TRS in the

ambient air shall be measured us ing a TRS thermal converter in conjunction with

an SO2 monitor. The SO2 monitor shall be designated as an EPA reference

method or equivalent method in accordance with 40 CFR Part 53. In combination,

the monitor must meet or exceed the following minimum specifications:

007.02A Lower detection limit of 0.4 ppb (parts per billion);

007.02B Zero Drift less than 0.5 ppb in 24 hours and less than 1 ppb in 7

days at constant conditions;

007.02C Span Drift of less t han 0.5 percent of the reading in 24 hours and

less than 1 percen t of the reading in 7 days at constant conditions;

007.02D Precision of 0.5 percent of the reading; and

007.02E Linearity of 1 percent of full scale.

007.03 A rolling average shall be considered valid if there is d ata for at least 75

percent of the period in question. In the event that less than 100 percent of the

data are available, the rolling average shall be computed on the basis of the data

available using the number of data available as the divisor.

007.04 The stand ards are attained when all of the following conditions are met:

007.04A The one

- minute concentration is less than or equal to 10.0 ppm,

rounded to one decimal p lace (fractional parts equal to or greater than 0.05

ppm must be rounded up);

007.04B The 30

- minute rolling arithmetic mean concentration is less than or

equal to 0.10 ppm, rounded to two decimal places (fractional parts equal to

or greater than 0.005 ppm must be rounded up);Title 129

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- 5 Enabling Legislation: Neb. Rev. Stat. §§81

- 1504(1)(2), 81

- 1505(1)(12)

Legal Citation : Title 129, Ch. 4, Nebraska Department of Environmental Quality