| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| HJ/T 398-2007 | English | 449 |
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Days<=3
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Stationary source emission - Determination of blackness of smoke plumes - Ringelmann smoke chart
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HJ/T 398-2007
| Valid |
HJ/T 398-2007
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