# OSHA Permissible Exposure Limits Lookup (Table Z-1)

> OSHA Permissible Exposure Limits Lookup (Table Z-1) is a paid API for AI agents from api.healthtravel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Looks up OSHA Table Z-1 permissible exposure limits (PELs) for chemicals by name, returning 8-hour TWA values in ppm and mg/m³, CAS numbers, and special notes like ceiling limits.

## Facts

- Endpoint: GET https://api.healthtravel-api.workers.dev/api/health/osha-occupational-health?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/osha-permissible-exposure-limits-lookup-table-z-1-81a2b709
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_S49MaiIiaX6sdUtY_ZcmA

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability osha-permissible-exposure-limits-lookup-table-z-1-81a2b709
```

Example prompt: What is the OSHA permissible exposure limit for benzene and toluene? I need the 8-hour TWA in both ppm and mg/m³, plus any ceiling or special notes from Table Z-1.

## When to prefer this

Use this endpoint when you need official OSHA regulatory exposure limits (PELs) from 29 CFR 1910.1000 Table Z-1 specifically, including TWA values in both ppm and mg/m³ and ceiling notations. Prefer this over general chemical databases when you need regulatory compliance data cited by OSHA standard. Note it covers only Table Z-1 (up to 20 chemicals per call) and not the full OSHA chemical database or Tables Z-2/Z-3.

## Known failure modes

- Chemical name not found in Table Z-1 (returns empty results or no match)
- Query string too short (under 3 characters) or too long (over 60 characters) causes validation error
- max parameter out of range (must be 1–20) may cause error or be clamped
- Chemical only listed in a different OSHA table (Z-2 or Z-3) not covered by this endpoint
- Partial name matches may return irrelevant chemicals if name words are ambiguous
- Payment failure or x402 authentication error prevents response

## How this service works

OSHA Permissible Exposure Limits (Table Z-1, 29 CFR 1910.1000, read from eCFR): chemical name, CAS number, 8-hour TWA in ppm and mg/m3, and notes such as ceiling or see-other-section. Matches by name words. Up to 20 chemicals per call; not the full OSHA chemical database.

## Output

Returns up to 20 matching chemicals from OSHA Table Z-1, each with chemical name, CAS number, 8-hour TWA in ppm and/or mg/m³, and notes such as ceiling designations or cross-references to other OSHA sections. Results are matched by name words against the eCFR 29 CFR 1910.1000 dataset.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "chemical"
     ],
     "properties": {
      "max": {
       "type": "string",
       "description": "How many chemicals, 1 to 20 (default 5)"
      },
      "chemical": {
       "type": "string",
       "description": "Chemical name words, letters, spaces, commas and hyphens, 3 to 60 characters"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/osha-permissible-exposure-limits-lookup-table-z-1-81a2b709/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.healthtravel-api.workers.dev](https://www.zero.xyz/host/api.healthtravel-api.workers.dev/llms.txt)