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Pm2.5 C oncentration
（
ug/m³)
Air Quality Pm1.0 C oncentration
（
ug/m³)
Air Quality
0-35 Excellent 0-50 Excellent
35-75 Good 50-100 Good
75-115 Mild pollution 100-200 Mild pollution
115-150 Moderate
pollution
200-300 Moderate
pollution
150-250 Severe pollution Above 300 Severe pollution
Above 250 Serious pollution
CO2 Concentration Comparison Table TVOC Concentration Comparison Table
CO2 C oncentration
（
ppm
）
Air Quality TVOC C oncentration
（
mg/m³
）
Air Quality
450-700 Fresh 0.0-0.6 Good
700-1000 Better 0.6-1.0 Mild pollution
1000-1500 Little turbid 1.0-1.6 Moderate
pollution
1500-2000 Turbid Above 1.6 Severe pollution
Formaldehyde Concentration Comparison Table
Formaldehyde Concentration
（
mg/m³
）
Air Quality
0.00-0.03 Excellent
0.03-0.1 Good
0.1-0.2 Mild pollution
0.2-0.3 Moderate pollution
0.3-0.8 Serious pollution
Above 0.8 Severe pollution