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EURASIP Journal on Wireless Communications and Networking

Table 10 Comparison of pollutant concentrations and sub-indices

From: Building an indoor air quality monitoring system based on the architecture of the Internet of Things

AQI index

NO2 (ppb)

SO2 (ppb)

O3 (ppm)

O3 (ppm)[1]

PM10 (µg/m3)

PM2.5 (µg/m3)

CO (PPM)

Air Quality Index (AQI)

Good (0–50)

0–53

0–35

0–0.054

–

0–54

0.0–15.4

0–4.4

Normal (51–100)

54–100

36–75

0.055–0.07

–

55–125

15.6–35.4

4.5–9.4

Unhealthy for sensitive groups (101–150)

101–360

76–185

0.071–0.085

0.125–0.164

126–254

35.5–54.4

9.5–12.4

Unhealthy for all groups (151–200)

361–649

186–304

0.086–0.105

0.165–0.204

255–354

54.5–15.4

12.5–15.4

Very unhealthy (201–300)

650–1249

305–604

0.106–0.2

0.205–0.404

355–424

150.5–250.4

15.5–30.4

Harmful (301–400)

1250–1649

605–804

[2]

0.405–0.504

425–504

250.5–350.4

30.5–40.4

Harmful (401–500)

1650–2049

805–1004

[2]

0.505–0.604

505–604

350.5–500.4

40.5–50.4

  1. [1] is the mean of O3 for 8 h
  2. [2] When the AQI is greater than 301, the calculation is based on the hourly values of O3, but not the 8-h value of O3
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