LIS

Virginia Law

Administrative Code

Creating a Report: Check the sections you'd like to appear in the report, then use the "Create Report" button at the bottom of the page to generate your report. Once the report is generated you'll then have the option to download it as a pdf, print or email the report.

Virginia Administrative Code
Title 9. Environment
Agency 5. State Air Pollution Control Board
Chapter 91. Regulations for the Control of Motor Vehicle Emissions in the Northern Virginia Area
11/21/2024

9VAC5-91-700. Calibration of exhaust gas analyzers.

The department shall use, and require for use, gases and containers meeting the following parameters, blends, and specifications in the calibration of exhaust gas analyzers:

1. The calibration gases for standardizing instruments shall conform to the provisions outlined in EPA420-B-04-011.

2. Gas analyzers shall pass a two-point gas calibration for HC, CO, CO2 and NO, within 72 hours before each test.

3. Gas analyzers shall pass a five-point gas audit for HC, CO, CO2, and NO at least two times within 12 months, and each time an analyzer system emissions measurement system, sensor, or other electronic components are repaired or replaced in response to an audit failure.

4. The director may reduce the frequency of calibrations in subdivision 2 of this section and audits in subdivision 3 of this section or both if evidence indicates accuracy would not be adversely affected.

Statutory Authority

§ 46.2-1180 of the Code of Virginia; § 182 of the Clean Air Act; 40 CFR Part 51, Subpart S.

Historical Notes

Derived from Virginia Register Volume 13, Issue 5, eff. January 24, 1997; amended, Virginia Register Volume 18, Issue 20, eff. October 1, 2002; Volume 29, Issue 24, eff. August 28, 2013.

Website addresses provided in the Virginia Administrative Code to documents incorporated by reference are for the reader's convenience only, may not necessarily be active or current, and should not be relied upon. To ensure the information incorporated by reference is accurate, the reader is encouraged to use the source document described in the regulation.

As a service to the public, the Virginia Administrative Code is provided online by the Virginia General Assembly. We are unable to answer legal questions or respond to requests for legal advice, including application of law to specific fact. To understand and protect your legal rights, you should consult an attorney.