【How-to】What are plant spores - Howto.org

On average, there are between 1,000 and 10,000 fungal spores in every cubic meter of air. “A person breathes in between 10,000 and 20,000 liters of air every day, and every breath contains between 1 and 10 spores,” commented Viviane Després of Johannes Gutenberg University Mainz.