California Code of Regulations › Title 8 - Industrial Relations › Division 1 - Department of Industrial Relations › Chapter 4 - Division of Industrial Safety › Subchapter 7 - General Industry Safety Orders › Group 16 - Control of Hazardous Substances › Article 107 - Dusts, Fumes, Mists, Vapors and Gases › Appendix A to Section 5141.1 - Protection from Wildfire Smoke Measuring PM2.5 Levels at the Worksite (Mandatory if an Employer Monitors with a Direct Reading Instrument)

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a) An employer may use a direct-reading particulate
						  monitor to determine PM2.5 levels for section
						  5141.1, if the employer can
						  demonstrate that it has complied with this appendix and selected a monitor
						  that:
(1) Does not underestimate employee exposures to
						  wildfire smoke; or
(2) May underestimate wildfire smoke exposures, but the
						  employer has obtained information on the possible error of the monitor from the
						  manufacturer and has accounted for the error of the monitor when determining
						  exposures to PM2.5 to ensure that employee exposure levels are not
						  underestimated.
(b) The monitor shall be designed and manufactured to
						  measure the concentration of airborne particle sizes ranging from an
						  aerodynamic diameter of 0.3 micrometers or less up to and including 2.5
						  micrometers ([LESS THAN EQUAL TO]0.3[MICRO]m to 2.5[MICRO]m).
(c) The employer shall ensure that the monitor and all
						  necessary monitor accessories are calibrated, maintained, and used, in
						  accordance with the manufacturer's instructions for accurately measuring
						  particles with an aerodynamic diameter of 0.3 micrometers or less up to and
						  including 2.5 micrometers ([LESS THAN EQUAL TO]0.3[MICRO]m to 2.5[MICRO]m). The
						  employer may use an air monitor that measures particles less than 0.3
						  micrometers to greater than 2.5 micrometers ([LESS THAN EQUAL TO]0.3[MICRO]m to
						  >=2.5[MICRO]m) if the employer treats the result as the PM2.5 level.
(d) The employer shall use the following table to
						  convert the PM2.5 concentration to the AQI for PM2.5.
PM2.5 in Micrograms per Cubic Meter
								  ([MICRO]g/m3)
Air
								  Quality Index (AQI) Categories for PM2.5
0 to 12.0
0 to 50
12.1 to 35.4
51 to 100
35.5 to 55.4
101 to 150
55.5 to 150.4
151 to 200
150.5 to 250.4
201 to 300
250.5 to 500.4
301 to 500
(e) The person supervising, directing, or evaluating
						  workplace monitoring for PM2.5 shall have the training or experience necessary
						  to apply this section and to ensure the correct use of the monitor and the
						  interpretation of the results, so that exposures are not
						  underestimated.
1. New
						  Appendix A filed 7-29-2019 as an emergency; operative 7-29-2019 (Register 2019,
						  No. 31). A Certificate of Compliance must be transmitted to OAL by 1-27-2020 or
						  emergency language will be repealed by operation of law on the following
						  day.
2. New Appendix A refiled 1-16-2020 as an emergency; operative
						  1-24-2020 pursuant to Government Code section
						  11346.1(d)
						  (Register 2020, No. 3). A Certificate of Compliance must be transmitted to OAL
						  by 4-23-2020 or emergency language will be repealed by operation of law on the
						  following day.
3. New Appendix A refiled 4-30-2020 as an emergency;
						  operative 6-23-2020 pursuant to Government Code section
						  11346.1(d)
						  (Register 2020, No. 18). A Certificate of Compliance must be transmitted to OAL
						  by 9-21-2020 or emergency language will be repealed by operation of law on the
						  following day.
4. Emergency filed 4-30-2020 and operative 6-23-2020
						  extended 60 days pursuant to Executive Order N-40-20 and an additional 60 days
						  pursuant to Executive Order N-66-20. A Certificate of Compliance must be
						  transmitted to OAL by 1-19-2021 or emergency language will be repealed by
						  operation of law on the following day.
5. Certificate of Compliance
						  as to 4-30-2020 order, including amendment of Appendix A, transmitted to OAL
						  12-17-2020 and filed 2-1-2021; amendments operative 2-1-2021 pursuant to
						  Government Code section
						  11343.4(b)(3)
						  (Register 2021, No. 6).
Note: Authority cited: Section
							 142.3, Labor
							 Code. Reference: Sections
							 142.3 and
							 144.6, Labor
							 Code.