Cal/OSHA · dir.ca.gov
Fibrogenic Dusts

Respirable Crystalline Silica Medical Surveillance

Respirable crystalline silica causes silicosis, lung cancer, COPD, and kidney disease; affects workers in construction, foundries, stone/countertop fabrication, sandblasting, and mining.

Action Level25 µg/m³ (8-hr TWA)
PEL50 µg/m³ (8-hr TWA)

General Industry

Who is covered: Exposed at/above the action level for 30+ days/year [5204(j)(2)(B)]. (5204 covers general industry/maritime; construction is excluded and covered under 1532.3.)

Evaluation performed by: PLHCP (physician or other licensed health care professional); specialist (pulmonologist/B-Reader) on referral

🩺 Baseline / Pre-Placement

Within 30 days of initial assignment, unless a qualifying exam was provided within the prior 3 years

  • Medical and work history — current/past silica exposure, respiratory symptoms (shortness of breath, cough, wheezing), history of tuberculosis, and smoking status
  • Physical examination with special emphasis on the respiratory system
  • Chest X-ray (single PA radiograph) classified per the ILO International Classification by a NIOSH-certified B Reader
  • Pulmonary function test — FVC, FEV1, and FEV1/FVC ratio, administered by a technician with a current NIOSH-approved spirometry course certificate
  • Latent tuberculosis infection testing
  • Any other tests deemed appropriate by the PLHCP
🕒 Periodic / Routine

Interval-based while covered — NOT result-triggered

Schedule: At least every 3 years (or more frequently if recommended by the PLHCP).

  • Medical and work history (respiratory symptoms, smoking status)
  • Physical examination with emphasis on the respiratory system
  • Chest X-ray classified per ILO by a NIOSH-certified B Reader
  • Pulmonary function test — FVC, FEV1, FEV1/FVC ratio by a certified spirometry technician
  • Any other tests deemed appropriate by the PLHCP
Abnormal results & exposure-event protocols

Abnormal Results & Exposure-Event Protocols

  • Chest X-ray classified as 1/0 or higher by the B Reader, OR referral otherwise deemed appropriate by the PLHCP 1910.1053(i)(7) (parallel CA provisions): Refer the employee to a specialist (e.g., a pulmonary specialist / B-Reader specialist). The specialist examination must be made available within 30 days after the PLHCP's written opinion. (A low-dose CT is NOT a codified requirement; it may be ordered at the specialist's discretion.) Tests: Specialist examination, Specialist may order additional studies at their discretion

Reporting Requirements

Who performs the evaluationPLHCP (physician or other licensed health care professional); specialist referral on abnormal X-ray
Reported to employerWritten medical opinion within 30 days of the examination, limited to: the date of the exam; a statement that the exam met the requirements of the section; and any recommended respirator-use limitations. Exposure limitations and the specialist-referral statement are included ONLY with the employee's written authorization.
Reported to / for the employeePLHCP's written medical report furnished to the employee within 30 days of each examination, including: exam results and any condition placing the employee at increased risk; recommended respirator-use and exposure limitations; and a statement (if applicable) that the employee should be examined by a specialist because the chest X-ray was classified 1/0 or higher.
Time limitsWritten report to employee within 30 days of each exam [(i)(5)]; written opinion to employer within 30 days of the exam [(i)(6)]; specialist exam available within 30 days after the PLHCP's written opinion [(i)(7)].
Second-opinion / multi-physician reviewNo formal multiple-physician dispute mechanism; abnormal-result specialist referral is the codified escalation.
RecordkeepingMedical surveillance records retained for the duration of employment plus 30 years (8 CCR 3204).

Medical Removal Protection

No medical removal protection scheme. Escalation is a specialist referral when the chest X-ray is classified 1/0 or higher.

Construction

Who is covered: Each employee required to use a respirator for 30+ days/year (respirator-based trigger, same as federal construction) [1532.3(h)(1)(A)]

Evaluation performed by: PLHCP (physician or other licensed health care professional); specialist (pulmonologist/B-Reader) on referral

🩺 Baseline / Pre-Placement

Within 30 days of initial assignment, unless a qualifying exam was provided within the prior 3 years

  • Medical and work history — current/past silica exposure, respiratory symptoms (shortness of breath, cough, wheezing), history of tuberculosis, and smoking status
  • Physical examination with special emphasis on the respiratory system
  • Chest X-ray (single PA radiograph) classified per the ILO International Classification by a NIOSH-certified B Reader
  • Pulmonary function test — FVC, FEV1, and FEV1/FVC ratio, administered by a technician with a current NIOSH-approved spirometry course certificate
  • Latent tuberculosis infection testing
  • Any other tests deemed appropriate by the PLHCP
🕒 Periodic / Routine

Interval-based while covered — NOT result-triggered

Schedule: At least every 3 years (or more frequently if recommended by the PLHCP).

  • Medical and work history (respiratory symptoms, smoking status)
  • Physical examination with emphasis on the respiratory system
  • Chest X-ray classified per ILO by a NIOSH-certified B Reader
  • Pulmonary function test — FVC, FEV1, FEV1/FVC ratio by a certified spirometry technician
  • Any other tests deemed appropriate by the PLHCP
Abnormal results & exposure-event protocols

Abnormal Results & Exposure-Event Protocols

  • Chest X-ray classified as 1/0 or higher by the B Reader, OR referral otherwise deemed appropriate by the PLHCP 1910.1053(i)(7) (parallel CA provisions): Refer the employee to a specialist (e.g., a pulmonary specialist / B-Reader specialist). The specialist examination must be made available within 30 days after the PLHCP's written opinion. (A low-dose CT is NOT a codified requirement; it may be ordered at the specialist's discretion.) Tests: Specialist examination, Specialist may order additional studies at their discretion

Reporting Requirements

Who performs the evaluationPLHCP (physician or other licensed health care professional); specialist referral on abnormal X-ray
Reported to employerWritten medical opinion within 30 days of the examination, limited to: the date of the exam; a statement that the exam met the requirements of the section; and any recommended respirator-use limitations. Exposure limitations and the specialist-referral statement are included ONLY with the employee's written authorization.
Reported to / for the employeePLHCP's written medical report furnished to the employee within 30 days of each examination, including: exam results and any condition placing the employee at increased risk; recommended respirator-use and exposure limitations; and a statement (if applicable) that the employee should be examined by a specialist because the chest X-ray was classified 1/0 or higher.
Time limitsWritten report to employee within 30 days of each exam [(i)(5)]; written opinion to employer within 30 days of the exam [(i)(6)]; specialist exam available within 30 days after the PLHCP's written opinion [(i)(7)].
Second-opinion / multi-physician reviewNo formal multiple-physician dispute mechanism; abnormal-result specialist referral is the codified escalation.
RecordkeepingMedical surveillance records retained for the duration of employment plus 30 years (8 CCR 3204).

Medical Removal Protection

No medical removal protection scheme. Escalation is a specialist referral when the chest X-ray is classified 1/0 or higher.

How this compares to Federal OSHA: Nearly identical — same 50/25 µg/m³ PEL/AL, same every-3-year periodic interval, same B-Reader/ILO chest X-ray plus FVC/FEV1/FEV1·FVC PFT and initial latent-TB battery, and the same 1/0 specialist-referral trigger. The general-industry (action-level trigger) vs construction (respirator trigger) split is identical in both jurisdictions. The only structural difference is that California splits silica into two sections (5204 general industry / 1532.3 construction) whereas federal uses 1910.1053 / 1926.1153. Low-dose CT is NOT a codified requirement in any silica standard.

Occu-Med handles Respirable Crystalline Silica surveillance end-to-end

Scheduling, exams, lab panels, physician review, removal/return determinations, and audit-ready recordkeeping — fully compliant with Cal/OSHA requirements.