# Calcium arsenate (as As) — workplace exposure limit

For Calcium arsenate (as As), niosh rel (mg/m³) is C 0.002; cas no. is 7778-44-1, verified against its source on 2026-09-08.

- **Substance:** Calcium arsenate (as As) _(verified: appears in its own passage below)_
- **CAS No.:** 7778-44-1 _(verified: appears in its own passage below)_
- **NIOSH REL (mg/m³):** C 0.002 _(verified: appears in the quote below)_

## What the source says

> NIOSH REL Ca C 0.002 mg/m3 [15-minute]

## Where each value comes from

This source states these in separate places, so each value is shown with the passage that states it.

### Substance

> CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium arsenate (as As)

### CAS No.

> CAS No. 7778-44-1

## What dir.ca.gov says

> 7778441 | | Calcium arsenate; see Arsenic, inorganic (see also Section 5214)

Source: https://www.dir.ca.gov/title8/5155.html

## Source

- https://www.cdc.gov/niosh/npg/npgd0089.html
- https://www.dir.ca.gov/title8/5155.html

Last verified: 2026-09-08. Review by: 2027-08-05.
Part of [US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side](https://referencesource.org/workplace-exposure-limits/).