Air Quality Index

Air Quality Index provides a rolling average of the
quality of the air you are breathing over the course
of a few hours.

The standard for EPA to Measure Air Quality.
Long Measurement Cycles for General Air Quality.
Number of Contaminants Sampled in HALO: 4-5.

Air Quality Index Factors:
Particulate Matter (2.5 μm, 10 μm)

Carbon Monoxide (CO)

Nitrogen Dioxide (NO₂)