咁我估計個數字係8.6ppm
如果係根據文中所指過10ppm先超標,係咁應該就無超標嘅。
Occupational HCN exposures at 1–10 ppm were acceptable at the time of these surveys as 10 ppm was the maximum acceptable concentration for workers.
https://www.ncbi.nlm.nih.gov/books/NBK207601/
都係個句,無對照加睇唔清成條片,做唔到結論。
再者,個彈係個碟入面又有好大影響。