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Table 2 IAQ index evaluation

From: Architecture for determining the cleanliness in shared vehicles using an integrated machine vision and indoor air quality-monitoring system

IAQ index

Air quality evaluation

Actions required

\(\le\) 1.99

No appreciable changes

None

2.0–2.99

Negligible changes

None

3.0–3.99

Noticeable changes

Minor increase in ventilation

4.0–4.99

Slight deterioration in air

Increase in ventilation

5.0–5.99

Significant deterioration in air

Significant increase in ventilation. Search for external sources recommended

\(\ge\) 6.0

Severe deterioration in air

Mandatory refresh of air. Mandatory search for external sources