Air Monitoring for Regulated Metals: Lead, Cadmium & Hexavalent Chromium
Three airborne metals get singled out under California rules: lead, cadmium, and hexavalent chromium.
Three airborne metals get singled out under California rules: lead, cadmium, and hexavalent chromium. Each one has its own standard, its own action level and permissible exposure limit, and its own set of obligations that kick in once monitoring confirms exposure. If your facility welds stainless, grinds painted steel, electroplates, melts or refines, casts, blasts, or works with cadmium-containing alloys or pigments, the question isn’t whether the rules apply. It’s whether your air sampling data is current enough to prove it.
This piece walks through the regulated-metals framework that sits on top of general Cal/OSHA Permissible Exposure Limits, what triggers a workplace dust exposure assessment for each metal, and what the deliverable looks like after the lab results come back. For the broader sampling methodology, see our air monitoring and sampling for Cal/OSHA PEL compliance guide. For the cluster overview, see our industrial hygiene services in California pillar.
Where We See These Exposures in California Facilities
When we walk a facility for an initial scoping visit, a handful of operations consistently surface lead, cadmium, or hex chrome exposure questions:
- Metal finishing and plating shops. Hex chrome from chrome plating tanks. Cadmium from cadmium plating lines that are still grandfathered into older operations.
- Welding, cutting, and grinding on stainless steel or chrome-coated parts. Stainless welding fume contains hex chrome. Grinding painted or coated steel can liberate lead.
- Foundries and secondary metal processing. Lead and cadmium fumes from melts, casting, and battery recycling.
- Demolition, renovation, and abrasive blasting. Lead from pre-1978 paint. Cadmium from older plated hardware.
- Pigment and coating manufacturing or application. Lead chromate, cadmium pigments, and chromate-based primers.
The most common trigger we see for metals sampling is a Cal/OSHA visit at a similar facility or a corporate parent flagging the operation in an internal audit. A new hire noticing the operation isn’t documented under the existing IH program is another common prompt. Once the question gets asked, the answer almost always involves personal breathing-zone sampling for the specific metal, analyzed against the substance-specific standard, not the general §5155 PEL table.
Lead: Cal/OSHA Title 8 §5198 (General Industry Lead Standard)
Lead is regulated separately under Cal/OSHA Title 8 §5198, the General Industry Lead standard (the construction analogue is §1532.1). Cal/OSHA also lists inorganic lead as a regulated carcinogen, and lead and lead compounds appear on the Proposition 65 list. The standard itself drives strict initial determination, periodic monitoring, written compliance program, regulated-area, and medical surveillance obligations once exposures cross the action level.
In practical terms: if an employee is working in an area where lead may be airborne, the standard requires an initial determination based on representative personal sampling. As of January 2025, Cal/OSHA’s revised §5198 sets the action level at 2 µg/m³ and the PEL at 10 µg/m³. If results exceed the action level, periodic monitoring, medical surveillance, biological blood-lead monitoring, training, hygiene facilities, and a written compliance program all attach.
Cadmium: 8 CCR §5207 and the Written Compliance Plan
Cadmium is regulated in California general industry under 8 CCR §5207. The PEL is 5 µg/m³ as an 8-hour TWA, with an action level of 2.5 µg/m³. Once monitoring shows exposures at or above the action level, the cadmium standard triggers a defined cascade:
- A written compliance program describing how the employer will reduce exposures to or below the PEL through engineering and work-practice controls.
- A regulated area with restricted access, posted warnings, and required PPE.
- A medical surveillance program with biological monitoring (blood cadmium, cadmium in urine, beta-2 microglobulin).
- Annual training and recordkeeping for exposed employees.
The Cadmium Plan we deliver after positive sampling follows the structure the standard requires, populated with the client’s actual operations, sampling data, and control plan. The point isn’t to hand over a template. It’s to walk into a Cal/OSHA inspection with a plan an inspector can read against §5207 paragraph by paragraph.
Hexavalent Chromium: PEL Sampling and Title 17 §93102 Reporting
Hex chrome carries a dual compliance load that confuses a lot of facilities. The occupational exposure piece sits under Cal/OSHA’s hexavalent chromium standard and is sampled by OSHA Method ID-215 against the PEL on a TWA basis, with action-level triggers for periodic monitoring, written exposure control, regulated areas, and medical surveillance similar in shape to the cadmium framework.
Separately, Title 17 CCR §93102 (the Hexavalent Chromium Airborne Toxic Control Measure, or ATCM) applies to certain chromium plating and chromic acid anodizing operations. It carries its own emission controls, source-test obligations, and an ongoing compliance status report submitted to the local air district. This is an air-toxics reporting obligation, not the same as the worker-exposure monitoring under Cal/OSHA. Operations subject to both need both deliverables. For the air-emissions side, see our California air quality compliance overview.
Side-by-Side: What Each Metal Triggers
| Metal | Primary standard | Typical sampling method | Key triggers once exposed above AL/PEL |
|---|---|---|---|
| Lead | Cal/OSHA Title 8 §5198 (General Industry; PEL 10 µg/m³ TWA, AL 2 µg/m³ as of Jan 2025) | NIOSH 7300 or 7082 (filter cassette, ICP/AAS) | Initial determination, periodic monitoring, written compliance program, regulated area, medical surveillance + blood-lead monitoring, training. Prop 65 carcinogen listing. |
| Cadmium | 8 CCR §5207 (PEL 5 µg/m³ TWA; AL 2.5 µg/m³) | NIOSH 7300 (filter cassette, ICP) | Written compliance plan, regulated area, medical surveillance with biological monitoring, annual training. |
| Hexavalent chromium | Cal/OSHA hex chrome standard (occupational); Title 17 CCR §93102 ATCM (air-toxics reporting) | OSHA Method ID-215 (filter cassette, IC) | Written exposure control, regulated area, medical surveillance (occupational); source testing and annual compliance status report (ATCM). |
After the Sampling: What Happens Next
The lab data is the easy part. The work that follows is what most facilities underestimate.
- Employee notification. Each substance-specific standard sets its own notification deadline: lead and hexavalent chromium require written notification of monitoring results within five working days; cadmium allows fifteen working days. Our reports include a notification template for each metal.
- Recordkeeping. Cal/OSHA’s general exposure-records rule (8 CCR §3204) requires retention for the duration of employment plus 30 years; medical records follow the same pattern. Lead’s substance-specific standard (§5198) carries its own retention schedule. The practical effect: if you have any documented lead, cadmium, or hex chrome exposure in your facility’s history, those records should stay in your IH file for decades.
- Written plan or program if thresholds are exceeded. For cadmium, that’s the written compliance plan. For lead, it’s the §5198 compliance program. For hex chrome, it’s the written exposure control plan (occupational) and, where the ATCM applies, the source-test schedule and ongoing compliance status report. We draft these alongside the sampling deliverable when the data triggers them, so the facility isn’t left with a positive result and no path forward.
Closing
Need the full picture of Cal/OSHA’s industrial hygiene rules? See the key California regulations for industrial hygiene →
Trusted throughout California
BSY started working with CDMS last year after our in-house EHS person departed the company. CDMS reviewed our existing operational permits as well as any additional Federal, State and Local regulations that could apply and helped us to create a comprehensive compliance calendar to track regulatory deadlines and submittal due dates. The CDMS team does an excellent job of tracking everything and can be relied upon to complete the forms accurately and assist with submittals, allowing me to focus on our business.
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