NYC-WTC_000208775

NYC 9/11 Public Portal Document

WTC Occupational Exposure LimIt List

Adjustment Adjustment Shirt Adj. Agent Category Factor TLV PEL OEL OEL Comment Metals Welding Furne 11 0.67 S 5 5 3,35 (mg/m3) PEL is for respirable dust Aluminum l-C 1 5 5 5 5 (mg/m3) TLVfor metal fume PEL for respirable fraction Antimony Hi 0.48 0.5 0.5 0.5 0,24 (mg/m3) Arsenic III 0.48 0.01 0.01 0.01 0.0048 (mg/m3) PEL STEL =1.0 Beryillum III 0.48 0.002 0.002 0.002 0.0010 (mg/rnS) PEL C= 0.005; TLV STEL = 0.01; NIC = 0.0002 Inhalable Gadmiurn III 0.48 0.0G2 0.005 0.002 0.0010 (mg/m3) TLV for respirable; Sea Table Z-2 for exclusions in 29 CFR 1910.1027 Ceidum 1-B 1 2 5 2 2 (mg/m3) Chromium III 0.48 • 0.5 1 0.5 0.24 (mg/m3) VI TLV = 0.05; VI PEL = G 0.1 Cobalt Hi 0.48 0,02 0.1 0.02 0.010 (mg/m3) Goppar it 0.67 0.2 0.1 0.2 0.134 (mg/m3) Iron III 0.48 5 10 5 2.4 (mg/m3) Iron Oxide; PEL as fume Lead III 0.43 0.05 0.05 0.05 0.024 (mg/m3) Magnesium H 0.67 10 15 10 6.7 (mg/m3) As fume Manganese IV 0.37 0.2 5 0.2 0.134 (mg/m3) PEL is Ceiling Nickel ill 0.43 1,5 1 1.5 072 (mg/m3) TLV asjnhalable Selanium IV 0.67 0.2 0,2 0,2 0.134 (mg/m3) Thallium ill 0.43 0.1 0.1 0.1 0.048 (mg/m3) Skin (both) III 0.43 2 2 2 0.96 (mg/m3) Titanium 1-C 1-C 10 15 10 10 (mg/m3) vanadium 1-B 1-B 0.05 0.1 0.05 0.05 (mg/m3) TLV for fume; PEL is C for fume Zinc 11 0.67 5 5 5 3,4 (mg/m3) Both as fume

Aldehydes Acetaldehyde 1-B 1 25 200 25 25 (ppm) TLV Is C Acrolein ■t-B 1 0.1 0.1 0.1 0.1 (ppm) TLV Is C Benzaldehyde 2 2 2 (ppm) TLV = WEEL: WEEL STEL = 4 I Formaldehyde 1-A 1 0.3 0.75 0,3 0.3 (ppm) TLV = C: PEL STEL = 2 n-Butyraldehyde 25 25 25 (ppm) TLV = WEEL I Propionaldehyde 20 20 20 (ppm) TLV = NIC for 2001 valeraldehyde 50 50 50 (ppm)

p Ardmatics

I I g Key: t 1 . OEL = the lower of the TLV and PEL 2 . NIG = Notice of Intended TLV Change value 3. WEEL " jkplace Environmental Exposure Limit (AIHA) Page/ / ()

NYC-WTC_000208775