To answer the question of how fast SafeAir badges will react, we will need to know the concentration of the chemical present in the environment as well as the overall time of the exposure. For example, the SafeAir TDI/MDI badge has an initial indication dose sensitivity of 5 ppb●hr, meaning at a concentration of 5 ppb of TDI, this badge will indicate exposure after being in the environment for one hour.

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