Which of the following best describes an air sampling strategy for mould?

Continuous sampling over several days is the most effective air sampling strategy for mould because it allows for the capture of fluctuations in mould spore concentrations that may occur due to changes in environmental conditions, occupancy patterns, and other factors over time. Mould growth and spore release can vary significantly depending on humidity, temperature, and activity levels in the area. By sampling continuously, the monitoring can provide a more comprehensive understanding of the mould concentration in the air, helping to identify true exposure levels and trends.

In contrast, random sampling at different times might miss peak spore release events or fluctuations that occur throughout the day. Sampling during peak traffic hours or only on rainy days might not adequately capture the complete picture of mould presence, as mould spores can be influenced by many factors that don't correlate solely with these conditions. Therefore, continuous sampling presents the most rigorous and informative method for assessing air quality concerning mould levels.