OSHA Heat Compliance App
Know exactly what Cal/OSHA requires the moment the heat crosses a line.
Mercury turns live worksite conditions into a deterministic §3395 / §3396 compliance decision, the required supervisor actions, and a timestamped record you can hand to an inspector.
No card required for the trial
California only for now
Mercury currently covers California worksites (8 CCR §3395 / §3396). Support for the six other states with their own OSHA-approved heat-illness standards — Oregon and Washington next — is on the roadmap.
This is not “AI tells you if it’s hot.” A written rules engine is the only thing that reads a temperature and produces a compliance status. AI is used once, at the end, to phrase that decision as one clear sentence — and the app works fully without it.
Everything a supervisor needs, nothing they don’t
Live worksite conditions
Street-level air temperature, humidity, heat index and wet-bulb for every pin — pulled from FortyGuard, refreshed automatically while a monitor is open.
Deterministic Cal/OSHA rules
A written rules engine encodes 8 CCR §3395 and §3396. It — not an AI — decides whether a legal threshold has been crossed, every time, the same way.
Timestamped evidence
Every reading, alert, acknowledgement and completed action is recorded with a time and the regulation it maps to. Export to CSV or print for an inspector.
Outdoor & indoor
Shade at 80°F, high-heat procedures at 95°F, the agriculture-only cool-down schedule, and the indoor §3396 82°F / 87°F tiers — including the ambiguous band.
Alerts that reach you
Critical status flashes the browser tab and fires a notification the moment a threshold is crossed — not just a number that quietly changes.
Multiple worksites
One dashboard across every site your crews are on today, each with its own live status, industry and indoor configuration.
How it works
Drop a pin
Place each worksite on the map and set outdoor/indoor and construction/agriculture.
Mercury watches conditions
Conditions refresh automatically. The rules engine re-evaluates on every reading.
Act on the checklist
When a threshold is crossed you get the exact required actions, cited to the regulation.
Keep the record
Every step is timestamped. Export or print the log whenever you need to show it.
Grounded in the actual regulation
8 CCR §3395 — Outdoor
- Shade required above 80°F; available on request below.
- High-heat procedures at 95°F.
- Agriculture-only 10-minute cool-down rest every 2 hours at 95°F.
- Acclimatization observation for new and returning employees.
8 CCR §3396 — Indoor
- Water, cool-down area and monitoring at 82°F.
- Engineering and administrative controls at 87°F.
- 82°F tier for heat-restrictive clothing or high radiant heat.
- States plainly when an input is missing rather than guessing.