AIR QUALITY INDICATOR

摘要

An air quality indicator for indicating high fine particle levels in an environment of interest. The indicator includes a frame maintaining first and second air filter media. The first air filter medium differs from the second air filter medium at least in terms of a change in visual appearance (e.g., color) when subjected to air flow containing fine particles.

主权项

1. An air quality indicator for providing an indication of high fine particle levels in air, the indicator comprising:
a frame defining first and second windows; a first air filter medium assembled within the first window; a second air filter medium assembled within the second window; wherein the first air filter medium is configured to have a rate of change in visual appearance in the presence of high fine particle level air flow that is greater than a rate of change in visual appearance in the presence of high fine particle level air flow of the second air filter medium.