| Table 2: Mean (SD) concentration (ppm) of gases produced during various types of welding | |||||||
| Gases | SMAW* | GMAW† | FCAW‡ | TLV-TWA§ | p value | ||
| CO | 48.50 (9.19) | 55.13 (12.21) | 24.10 (8.16) | 25 | 0.03 | ||
| NO | 7.50 (2.17) | 13.32 (3.76) | 3.85 (1.02) | 50 | 0.01 | ||
| NO2 | 2.85 (1.14) | 3.32 (0.73) | 1.02 (0.23) | 0.2 | 0.12 | ||
| O3 | 0.22 (0.06) | 0.31 (0.10) | 0.15 (0.04) | 0.05 | 0.35 | ||
| CO2 | 4300.34 (1032.10) | 5086.03 (1535.47) | 2502.90 (751.44) | 5000 | 0.04 | ||
| *Shielded metal arc welding; †Gas metal arc welding; ‡Flux cored arc welding; §Threshold limit value-time weighted average | |||||||
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