The incoming limit for polyvinyl chloride respirable dust is an 8-hour average of 1 mg/m³. There was no previous exposure standard on this respirable line. Exposure standards remain the compliance reference for the wider list until 30 November 2026. From 1 December 2026 the new limit applies once the WHS regulator gives it effect. The […]
PVC respirable dust WEL 1 mg/m³ — fraction and survey design Read More »
The incoming 8-hour limit for phthalic anhydride is 0.0003 ppm. The exposure standard it replaces is 1 ppm. Exposure standards remain the compliance reference until 30 November 2026. From 1 December 2026 the new limit applies once the WHS regulator gives it effect. The published change has no short-term exposure limit. Do not add one.
Phthalic anhydride 1 ppm to 0.0003 ppm — method and survey design Read More »
Ethylene oxide (oxirane) is classed as a non-threshold genotoxic carcinogen with no Workplace Exposure Limit from 1 December 2026. Until 30 November 2026 the current exposure standard is still the numeric reference. The changes list leaves both the old standard and any new limit blank for this row. Do not invent a December figure, and
Ethylene oxide NTGC — no WEL from 1 Dec; WES until 30 Nov; SFARP evidence Read More »
The incoming comparator for dichloroacetic acid is an 8-hour time-weighted average of 2.5 mg/m³ (0.5 ppm). There was no previous exposure standard on this listing. Exposure standards remain the compliance reference until 30 November 2026. From 1 December 2026 the new limit applies once your WHS regulator gives it effect. The published change does not
Dichloroacetic acid WEL 2.5 mg/m³ (0.5 ppm) — method and open-handling interpretation Read More »
OH method note for manganese’s dual WEL — inhalable 0.1 and respirable 0.02 mg/m³ as Mn: sampler fraction choice, weld/grind/foundry SEGs, TWA interpretation, f
Peracetic acid’s WEL from 1 Dec 2026 is a peak limitation of 0.4 ppm (1.24 mg/m³). How to sample the short peaks and judge the maximum result.
Portland cement appears on the WEL changes list as WES_reduced: previous WES TWA 10 mg/m³ → WEL TWA 1 respirable mg/m³. Until 30 November 2026, WES remains the compliance reference. From 1 December 2026, WEL applies once implemented — verify with the WHS regulator for your jurisdiction. What you are measuring The WEL comparator is
Portland cement WEL 1 mg/m³ respirable — fraction, method and interpretation Read More »
Benzoyl chloride is a new WEL listing with an 8-hour TWA of 2.8 mg/m³ (0.5 ppm). Until 30 November 2026, WES remains the reference; from 1 December WEL applies once implemented. Check the WHS regulator. Measure and define SEGs This reactive acyl chloride is typically vapour, with aerosol possible during spraying, transfer or containment failures.
Benzoyl chloride WEL 2.8 mg/m³ (0.5 ppm) — monitoring strategy and interpretation Read More »
Diacetyl is a new airborne contaminant with an 8-hour TWA of 0.04 mg/m³ (0.01 ppm) and a STEL of 0.07 mg/m³ (0.02 ppm). WES remains the reference until 30 November 2026; from 1 December 2026 WEL applies once implemented—verify with the WHS regulator. What to measure Diacetyl is usually vapour, with aerosol possible during powder
Diacetyl WEL 0.04 mg/m³ TWA / 0.07 mg/m³ STEL — monitoring strategy and interpretation Read More »
But-2-yne-1,4-diol is listed as a new airborne contaminant with an 8-hour WEL of 0.5 mg/m³. WES remains the reference until 30 November 2026; from 1 December 2026 WEL applies once implemented—confirm with the WHS regulator. Do not invent ppm or a STEL. Characterise the aerosol Powder handling (bag tip, weigh, blend and mill) is primarily
But-2-yne-1,4-diol WEL 0.5 mg/m³ — fraction, method cues and result interpretation Read More »