What does the dry air free ratio (or vitiation content) calculate?

The dry air free ratio, often referred to as vitiation content, specifically calculates the amount of atmospheric air present in a sample. This measurement is crucial for making accurate comparisons among different gas samples, especially in various analytical and environmental contexts. By isolating the atmospheric component, it allows for a clearer understanding of the composition of the sample, excluding moisture and any other potentially interfering substances. This is particularly important in studies related to air quality, pollutant monitoring, and atmospheric sciences, where knowing the true concentration of constituents is essential for accurate assessments and evaluations.