Cal. Code Regs. Tit. 17, div. 3, ch. 1, subch. 1.5, art. 3, app 3

Current through Register 2024 Notice Reg. No. 44, November 1, 2024

Appendix 3 - Criteria for Determining Data Completeness

This Appendix describes the criteria to be used in determining data completeness for the purpose of designating areas as described in this article. These Criteria for Determining Data Completeness (Completeness Criteria) apply only to air quality data used in designating an area as attainment or nonattainment-transitional. Air quality data used in designating an area as nonattainment do not need to be complete. The purpose of these Completeness Criteria is to specify the minimum amount of data deemed necessary to ensure that sampling occurred at times when a violation is most likely to occur.

After a set or group of air quality measurements or statistics are deemed representative under the Criteria for Determining Data Representativeness set forth in Appendix 1 to this article, they are then evaluated under these Completeness Criteria to ensure that the group of representative measurements or statistics reflect the time of day and the season of the year during which high concentrations are likely to occur.

Complete Data

Data for a site will be complete if there are representative data (as determined in accordance with the Representativeness Criteria in Appendix 1 to this article) during the required hours (see below) of the day during the required months (see below) for the required years (see below).

Required Hours

The hours of potentially high concentration must be included. Unless a detailed evaluation determines different hours to be appropriate for a specific site, these hours are:

Pollutant	Hours (PST)
Ozone	9 am-5 pm
Carbon Monoxide	3 pm-9 am (next day)
Nitrogen Dioxide	8 am-8 pm
Visibility Reducing Particles	10 am-6 pm
Other Pollutants	Throughout day

Required Months

The months of potentially high concentrations must be included. Unless a detailed evaluation determines different months to be appropriate for a specific site, these months are:

Pollutant	Months
Ozone	July-September
Carbon Monoxide	January, November-December
Sulfur Dioxide	September-December
Sulfates	January, June-December
Lead (Particulate)	January, November-December
Other Pollutants	January-December

Required Years for an Attainment Designation

The number of years to be included for an attainment designation is:

(a) Three; or

(b) Two, if during these years the maximum pollutant concentration (not including data found to be affected by a highly irregular or infrequent event under the procedure set forth in Appendix 2 to this article) is less then three-fourths the applicable state ambient air quality standard; or

(c) One, if during this year the maximum pollutant concentration (not including data found to be affected by a highly irregular or infrequent event under the procedure set forth in Appendix 2 to this article) is less than one-half the applicable state ambient air quality standard.

Cal. Code Regs. Tit. 17, div. 3, ch. 1, subch. 1.5, art. 3, app 3

1. Amendment of Appendix 3 to sections 70300-70306 filed 4-16-93; operative 5-17-93 (Register 93, No. 16).
2. Amendment filed 11-10-94; operative 12-12-94 (Register 94, No. 45).
3. Amendment of first and second paragraphs filed 8-26-99; operative 9-25-99 (Register 99, No. 35).
4. Amendment filed 6-7-2004; operative 7-7-2004 (Register 2004, No. 24).
5. Amendment of paragraph "Required Months" and new NOTE filed 8-26-2010; operative 9-25-2010 (Register 2010, No. 35).

Note: Authority cited: Sections 39600, 39601, 39607 and 39608, Health and Safety Code. Reference: Sections 39607 and 39608, Health and Safety Code.