Explainer · 5 min read
How Passive Air Sampling Works
Diffusive badges collect airborne chemicals without pumps or power. Here is the science behind the stillness.
Everyone · Sampling methods
Passive samplers rely on diffusion — the natural movement of gas molecules from higher to lower concentration. Inside each badge, a sorbent material captures target chemicals at a predictable rate.
Because the uptake rate is characterized for each chemical, the laboratory can calculate an average airborne concentration from the mass collected and the deployment time you record.
This is why accurate start and end times matter: they are part of the calculation, not just paperwork.
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