Breathing Problems from Work: Respiratory Claims in California Comp

Occupational asthma, COPD, dust and wildfire-smoke exposure: how California rates breathing impairment on objective pulmonary testing, engine-computed dollars from mild to severe, the smoking apportionment fight, and the safety-member pneumonia presumption.

Checked against primary sources · Oct 19, 2026 · Editorial standards

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Lung claims are comp’s most objective cases: the impairment comes off pulmonary function tests — FEV1, FVC, diffusion — numbers a machine prints and the AMA Guides convert to WPI. That objectivity cuts both ways, and the money runs higher than most people guess. Figures computed by the engine.

How breathing is measured

Occupational asthma rates under 05.01.00.00, scored on post-bronchodilator spirometry, airway reactivity, and the medication it takes to control it; other respiratory disorders rate under 05.02 on pulmonary function and exercise testing — FVC, FEV1, diffusing capacity, or VO2max. Both use the same four classes: class 2 runs 10–25% WPI, class 3 26–50%, and class 4, which the Guides treat as severe impairment, 51% and up. The engine-computed money at the 2026 maximum:

10% WPI · clerical 111E

13% PD · $12,252.50

25% WPI · carpenter 380H

41% PD · $60,320

40% WPI · group 490I

65% PD · $113,462.50

The trades and the heavy-exposure occupations draw the high variants — the same 25% WPI is $42,050 at a desk and $66,410 in group 490, because breathing capacity is physical work capacity.

The exposure cases: dust, fumes, smoke

Silica, isocyanates, cleaning chemicals, diesel exhaust — classic sources, usually pleaded as cumulative trauma with §5412 dates. The emerging file is wildfire smoke: California’s outdoor workforce breathes it for weeks at a time, and exposure-driven asthma and COPD claims follow the same path — document the exposure, get the PFTs, connect them medically. Baseline testing before the next smoke season is the cheapest evidence an outdoor worker will ever buy.

The two standard fights

Smoking apportionment (§4663): the defense theme in every lung case; it is the defense’s burden, met only by a medical opinion that explains its reasoning, not a reflex discount — how apportionment works. And causation in mixed-exposure histories, which the med-legal record wins or loses. Safety members short-circuit both, but only for pneumonia: firefighters and peace officers carry the pneumonia presumption (§3212; §3212.5 for police, sheriffs, and CHP) with anti-attribution protection, and it does not reach asthma or COPD. Severe cases add lifetime medical that often outweighs the PD itself. Companion pages: back · knee · shoulder · neck · hip · wrist · ankle · elbow · foot · hand · carpal tunnel · hearing · eye · amputation · fusion · knee replacement · rotator cuff · hip replacement · hernia · head injury · herniated disc · meniscus · ulnar nerve · heart. Estimates for informational use; not legal or medical advice.

Rate your lungs right here

Same engine as the tables above — pick your occupation and age, slide the WPI from the report, and carry it into the full calculator when you’re ready.

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FAQ

How much is a respiratory workers’ comp claim worth in California?

Engine-computed at the 2026 maximum, age 37–41, for occupational asthma: 10% WPI rates 13% PD ($12,252.50) at a desk, 18% ($18,995) for a carpenter, and 20% ($21,895) in group 490; 25% WPI, the top of class 2, runs $42,050–$66,410; 40% WPI, mid–class 3, reaches $85,622.50–$113,462.50 — plus the medical award, which in chronic lung cases often outweighs the indemnity.

Is wildfire smoke exposure a workers’ comp claim?

For workers required to work outdoors through smoke events — agriculture, construction, delivery, landscaping — respiratory injury from exposure is a compensable claim like any other inhalation injury, usually pleaded as cumulative trauma with the §5412 date rules. The medicine is documented by pulmonary function testing before and after; the earlier a baseline exists, the stronger the claim.

Can the insurance company blame my smoking?

Expect it — §4663 apportionment to smoking history is the standard defense in every lung case. It is a medical opinion, not an automatic discount: the QME must explain what share of the impairment each cause contributes. For qualifying firefighters and peace officers, pneumonia carries a §3212 presumption (§3212.5 for police, sheriffs, and CHP) and the anti-attribution rules blunt this fight entirely.

About this guide. Rating and dollar figures here are computed with — or checked against — RateString’s rating engine, which reproduces the State’s own published worked examples (see the proof). Where the guide relies on a statute or regulation, it cites it in the text. Descriptive information, not legal advice. See something wrong? Report an error.