Design and Development of a Low-Cost, Portable Monitoring Device for Indoor Environment Quality

Table 5

IEQ index scoring system.

IEQ parameter	“Good”	“Average”	“Poor”	“Bad”
Humidity	40–50%	50–60%	60–70%	70 > H > 40%
Temperature	20–24°C	16–20°C	24–26°C	26 > T > 16°C
PM2.5	0–10 μg/m^3	10–15 μg/m^3	15–35 μg/m^3	>35 μg/m^3
PM10	0–50 μg/m^3	50–80 μg/m^3	80–150 μg/m^3	>150 μg/m^3
Total VOC	0–200 ppb	200–350 ppb	350–500 ppb	>500 ppb
CO2	350–500 ppm	500–1000 ppm	1000–5000 ppm	>5000 ppm
CO	0–3 ppm	3–8 ppm	8–10 ppm	>10 ppm
Indoor air quality	0–10 ppm	10–25 ppm	25–50 ppm	>50 ppm
Illuminance	300–500 lux	200–300 lux	100–200 lux	<100 lux
Sound levels	0–40 dB	40–70 dB	70–80 dB	>80 dB
Scoring impact	0	0.2	0.5	1.0