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Material Volume Concentration (ppm) and Mass Concentration (mg/m3) Conversion Table

Jun 16, 2025
NO.   Gas Molecular
Formula		 Molecular
Weight		   ppm mg/m3
1  Formaldehyde HCHO 30  0～10 0～13
2  Toluene C7H8 92  0～20 0～80
3  Ammonia NH3 17  0～50 0～38
Ammonia NH3 17  0～100 0～75
4  Carbon Monoxide CO 28  0～2000 0～2500
0～20000 0～25000
5  Ozone O3 48  0～5 0～10
0～100 0～214
0～1000 0～2140
6  Hydrogen Sulfide H2S 34  0～50 0～75
0～1000 0～1517
7  Chlorine Cl2 71  0～20 0～63
8  Hydrogen H2 2  0～1000 0～89
0～10000 0～890
9  Hydrogen Cyanide HCN 27  0～100 0～120
10  Hydrogen Chloride HCl 36.5  0～50 0～81
11  Ethylene C2H4 28  0～20 0～25
12  Sulfur Dioxide SO2 64  0～20 0～57
0～100 0～285
0～500 0～1428
0～5000 0～14285
13  Nitric Oxide NO 30  0～300 0～401
0～1000 0～1339
14  Nitrogen Dioxide NO2 46  0～100 0～205
0～1000 0～2053
15  Hydrogen Fluoride HF 20  0～10 0～8.9
16  Fluorine F2 38  0～10 0～16.96
17  Bromine Br2 160  0～30 0～214
18  Phosphine PH3 34  0～20 0～30
0～1000 0～1517
19  Phosphine C2H5OH 46  0～100 0～205
20  Acrylonitrile C3H3N 53  0～100 0～250
21  Ethyl Acetate 0～100
22  Acetylene C2H2 26  0～100 0～120
23  Chlorine Dioxide ClO2 67．5 0～10 0～30
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