AQI is an acronym for Air Quality Index.

Measuring AQI is determined by the EPA. It is used to evaluate the quality of the environment regarding the chemicals in the air. An AQI reading can provide us with a number that represents how polluted the air might be. The HALO Smart Sensor provides an AQI measurement that is a rolling average of the quality of the air you are breathing over the course of a few hours.


The HALO makes long measurement cycles for general air quality for the following contaminants:

Particulate Matter (2.5 μm, 10 μm)

Carbon Monoxide (CO)

Nitrogen Dioxide (NO₂)