Breathing Air

Introduction

Composition

Analysis

Medical Gas

Introduction

Analysis

Sulfur Dioxide (SO₂) Contamination:

Sulfur dioxide is a highly irritating, non-flammable, colourless, toxic gas. It is intensely irritating to the eyes, throat and respiratory tract. Inhalation of sulfur dioxide in concentrations of 8-12 ppm in air causes throat irritation, coughing, constriction of the chest and tearing of the eyes. The odour of sulfur dioxide provides good warning. The normal person can detect 3-5 ppm by volume in air. Lower concentration creates a taste sensation, even before the odour becomes detectable.  Detectable SO₂ levels above 1 ppm are "abnormal" & require further investigation.