Table 4.

Results of airborne measurement of chemicals (2002-2007)

All the chemicals were measured during 8 working hour for a full time shift.

Unit: parts per million (PPM) for gases except AsH₃, alcohols and glycols and hydrofluoric acid, parts per billion (PPB) for AsH₃, mg/m³ for and metals and acid-bases except hydrofluoric acid, OEL: occupational exposure limit of Korea for 8 hour working time.

GM: geometric mean, ND: non-detectable, Cl₂: chloride, O₃: ozone, CO₂: carbon dioxide, NO: nitrogen monoxide, AsH₃: Arsin, PH₃: phosphine, CO: carbon monoxide, NH₃: ammonia, HCL: Hydrochloric acid, H₂O₂: hydrogen peroxide, HF: hydrofluoric acid, HBr: hydrobromic acid, H₂SO₄: sulfuric acid (Group 1 carcinogen in International Agency of Research on Cancer), HNO₃: nitric acid, KOH: Potassium hydroxide, H₃PO₄: phosphoric acid, AA: acetic acid, IPA: isopropyl alcohol, EG: ethylene glycol, Cu: copper, Pb: lead, Sn: Tin.

^*Lower than 10% of OEL.

^†10-50% of OEL.

^‡Ceiling limit.