BLOGS

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...

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...

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...

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...

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....

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...

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...