Table 2.
Carbon and nitrogen oxide concentrations after combustion of six brands of indirect moxa
| CO2 (ppm) | CO (ppb) | NO (ppb) | NO2 (ppb) | NOx (ppb) | |
|---|---|---|---|---|---|
| Blank | 748 | 0.002 | 0.009 | 0.008 | 0.012 |
| A | 688 | 0.007 | 0.051 | 0.026 | 0.077 |
| B | 600 | 0.006 | 0.025 | 0.025 | 0.058 |
| C | 647 | 0.005 | 0.015 | 0.021 | 0.036 |
| D | 636 | 0.006 | 0.050 | 0.031 | 0.081 |
| E | 671 | 0.005 | 0.019 | 0.025 | 0041 |
| F | 653 | 0.006 | 0.020 | 0.031 | 0.051 |
| Limit | 1000 | 0.05 | 0.05 |
Blank refers to indoor air condition before combustion. Limit refers to upper safety threshold according to Korean environmental law. A to F represent six different brands of indirect moxa.
CO2, carbon dioxide; CO, carbon monoxide; NO, nitric oxide; NO2, nitrogen dioxide; NOx, nitrogen oxide; ppb, parts per billion; ppm, parts per million.