California Code of Regulations › Title 17 - Public Health › Division 3 - Air Resources › Chapter 1 - Air Resources Board › Subchapter 1.5 - Air Basins and Air Quality Standards › Article 3 - Criteria for Determining Area Designations › Appendix 3 - Criteria for Determining Data Completeness

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
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.
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.