Diffusion tube

A diffusion tube is a passive sampling device used to measure the concentration of certain gases or pollutants in the atmosphere, particularly in air quality monitoring. These tubes are typically made of a plastic or glass casing filled with a specific absorbent material or chemical that reacts with the target gas. ### Key Features of Diffusion Tubes: 1. **Passive Sampling**: Diffusion tubes work without the need for pumps or electrical components.