---
title: "Carbon dioxide (124-38-9): exposure limits and sampling"
url: https://analyt-mtc.com/tools/hazard-search/carbon-dioxide-124-38-9/
lang: en
alternates:
  en: https://analyt-mtc.com/tools/hazard-search/carbon-dioxide-124-38-9/
  de: https://analyt-mtc.com/de/tools/gefahrstoffsuche/carbon-dioxide-124-38-9/
---

Hazard search

# Carbon dioxide

CAS number

124-38-9

Also known as

Carbon dioxide (by portable GC) · Carbonic acid gas · CO2 · Dry ice

## UK workplace exposure limits

| Limit | Value | Applies to |
| --- | --- | --- |
| 8-hour TWA | 5000 ppm |  |
| 8-hour TWA | 9150 mg/m³ |  |
| 15-minute STEL | 15000 ppm |  |
| 15-minute STEL | 27400 mg/m³ |  |

## Sampling methods

| Method | Sampling | Medium | Analysis | Part numbers |
| --- | --- | --- | --- | --- |
| **NIOSH 6603** / Carbon dioxide by portable GC / [Method document (opens in a new tab)](https://www.cdc.gov/niosh/docs/2003-154/pdfs/6603.pdf) | Active (pump) | Five-layer Sampling Bags | P GC-TCD | [232-01](https://analyt-mtc.com/catalog/product/skc-tedlar-sample-bags/#part-232-01) |
| **OSHA ID 172** | Active (pump) |  | GC-TCD | [253-01](https://analyt-mtc.com/catalog/product/skc-flexfoil-plus-sample-bags/#part-253-01) / [263-01](https://analyt-mtc.com/catalog/product/standard-flexfoil-sample-bags-2/#part-263-01) |
| **OSHA ID-172** |  |  | GC |  |
| **Non-agency** / Carbon dioxide by Colorimetric analysis | Direct-reading | Gastec Detector tube |  | 810-2 |
| **Non-agency** / Carbon dioxide by Colorimetric analysis | Passive | Gastec Dosi-tube |  | [810-2D](https://analyt-mtc.com/catalog/product/gastec-passive-dosi-tubes/#part-gst-2d) |
| **Other** | Passive |  | DR | [810-2D](https://analyt-mtc.com/catalog/product/gastec-passive-dosi-tubes/#part-gst-2d) |

Methods and limits as published by their agencies and summarised by SKC; check the current method and the limit that applies to you before sampling.

Source: [SKC Ltd (UK), Hazard Search, used with SKC's permission (opens in a new tab)](https://www.skcltd.com/hazard-search.html); [SKC Inc. (USA), Sampling Guides, used with SKC's permission (opens in a new tab)](https://international.skcinc.com/sampling-guides/)