5
Operation and settings
6062-en_V2.4_02/21
35
5.2.1.3
Air Quality Index
When the respective package is implemented, the “Air Quality Index” (AQI)
is among the values displayed. The AQI is an air quality parameter.
The displayed AQI is between 0 and 101 and has the following meaning:
Indicated AQI
Index class
Air quality
0 – 25
Very low
Very good
25 – 50
Low
Good
50 – 75
Medium
Medium
50 – 100
High
Poor
101
Very high
Very poor
Calculation of AQI
The measured concentrations of these substances are used for the
calculation:
• PM
2.5
• PM
10
• CO
2
• TVOC
A single AQI is calculated for each of these substances. The basis of the
calculations is the average over the last hour (1 h).
The highest of the four calculated AQI is displayed.
AQI
(calculated)
PM
2.5
(1h)
in µg/m
3
PM
10
(1h)
in µg/m
3
CO
2
(1h)
in ppm
TVOC (1h)
in mg/m
3
0
0
0
450
0
25
15
25
600
0.3
50
30
50
1000
1
75
55
90
1500
3
100
110
180
1800
10
101
> 110
> 180
> 1800
> 10
The calculations and limits follow the recommendations of the CITEAIR
project of the European Union (for PM values) and of the German
Environmental Agency (for CO
2
and VOC).