Benzene’s workplace limit will drop five-fold, to 0.2 ppm, from 1 June 2027. The other eight deadlocked chemicals still wait on an expert panel

The short answer

• The new number: 0.2 ppm (0.7 mg/m³) as an eight-hour time-weighted average, down from 1 ppm (3.2 mg/m³). That is a five-fold cut.
• When: 1 June 2027. Safe Work Australia says the current standard will continue to apply until then.
• Why the gap: the date, in Safe Work Australia’s words, gives industry and employers time to review monitoring and compliance arrangements, and implement any necessary control measures.
• Everything else: the rest of the new workplace exposure limits list still starts on 1 December 2026. The other eight deadlocked chemicals are unchanged for now.

Exhibit A · from the source

From 1 June 2027, the WEL for benzene will be reduced to 0.2 ppm (0.7 mg/m³) as an 8-hour time-weighted average (TWA).

Until 1 June 2027, the current workplace exposure standard for benzene of 1 ppm (3.2 mg/m³) as an 8-hour TWA will continue to apply.

What changed since June

In June, Safe Work Australia published its Decision Regulation Impact Statement on nine chemicals carved out of the move to health-based limits: benzene, chlorine, copper, formaldehyde, hydrogen cyanide, hydrogen sulphide, nitrogen dioxide, respirable crystalline silica and titanium dioxide. It recommended the tighter limits for all nine. Ministers did not agree: Safe Work Australia recorded that a majority had not been reached and that there would be no changes for the nine from 1 December 2026. We reported that in July.

The 29 October notice says ministers have now reconsidered the reduced WEL for benzene following further work and a recommendation by Safe Work Australia Members, and agreed to adopt it. Safe Work Australia Members is the agency’s governing body. On the remaining chemicals the notice says only that The other 8 chemicals in the DRIS are currently the subject of further work by an independent expert panel. It gives no date for that work.

Current numbers from Table 3 of the Decision Regulation Impact Statement; benzene’s new limit and date from the 29 October notice. TWA is the eight-hour time-weighted average, STEL the 15-minute short-term limit, peak the maximum at any time. The notice gives no date for the expert panel’s work.

Why benzene

The notice gives the health case directly: benzene is a known human carcinogen, and workplace exposure is associated with serious long-term health effects, including blood cancers such as acute myeloid leukaemia. It calls the new limit a health-based measure that aligns with international standards. In June the Decision Regulation Impact Statement had said the current limits for all nine chemicals are not health-based, a point we set out in our July story.

Who it reaches

Benzene is the most widespread chemical exposure in Safe Work Australia’s own count. Its 2026 Australian Worker Exposure Survey estimates that 31.0 per cent of all workers are probably exposed to benzene, and assesses most of that, 25.4 per cent of all workers, as low level. Our survey story sets out how the survey defines those levels. A five-fold lower limit moves the line that “low” and “high” are measured against, so some exposures assessed against 1 ppm will look different against 0.2 ppm.

Will every state start on 1 June 2027?

The notice does not say. Exposure limits take legal effect as each jurisdiction writes them into its own WHS laws, and the notice tells readers to Check with your WHS regulator about the implementation of the WEL in your state or territory. States have diverged before: in a separate 22 October notice on phosphine, Safe Work Australia said Some states have advised that they will delay implementation of the WEL for phosphine beyond December 2026. So treat 1 June 2027 as the agreed national date, and confirm it with your own regulator before you plan against it.

What to do with the seven months

If you store, handle or work near fuels, solvents or petrochemicals: find out whether your existing air monitoring results sit below 0.2 ppm, not just below 1 ppm. A result that passed comfortably against the old number may not pass against the new one. The duty to minimise exposure so far as reasonably practicable already applies below any limit, as our July story explains, and our story on the national monitoring review covers what the current rules require and where they are unclear.

If you hold a chemical register or safety data sheets: benzene now needs a dated note. From 1 December the new list carries benzene at 1 ppm; from 1 June 2027 it changes again.

Our read

This section is opinion, built on the documents cited above.

This is the right call, and the date is defensible. Benzene is the clearest case of the nine: a known carcinogen, the single most common chemical exposure in the regulator’s own survey, and a limit Safe Work Australia’s analysis already said was not health-based. A seven-month runway to retest and adjust controls is a reasonable price for getting the number right.

It also shows the June deadlock was not final, which matters most for silica. The other eight now sit with an expert panel and no published timetable. A duty holder with silica, formaldehyde or hydrogen sulphide exposure should not read that silence as a settled number: benzene has just shown that a carried-over limit can change with seven months’ notice. We will report the panel’s outcome for the other eight when Safe Work Australia publishes it.