WEL Substance Profile

Formaldehyde — Workplace Exposure Limit Change

CAS: 50-00-0 | Notation: Carcinogen (IARC Group 1), skin sensitiser

Current WES

ppm

New WEL (Dec 2026)

0.3

ppm

Change

-70%

reduction

Health Effects

Formaldehyde is classified as a Group 1 carcinogen by IARC, with sufficient evidence of causing nasopharyngeal cancer and leukaemia in humans. It is also a strong respiratory and skin sensitiser that can cause occupational asthma and allergic contact dermatitis. At concentrations above 0.1 ppm, formaldehyde causes irritation of the eyes, nose, and throat — symptoms that serve as a warning of exposure but do not protect against carcinogenic effects at lower concentrations. Chronic exposure at levels below the current WES has been associated with chronic rhinitis, decreased lung function, and increased susceptibility to respiratory infections. Formaldehyde is highly water-soluble, which means it is rapidly absorbed in the upper respiratory tract where it exerts its primary carcinogenic effects on nasal and nasopharyngeal tissues.

Where Exposure Occurs

Manufacture of formaldehyde-based resins (urea, melamine, phenol)Pathology and anatomy laboratories using formalin fixativeTimber product manufacturing (plywood, MDF, particleboard)Textile finishing and wrinkle-resistant treatment processesEmbalming operations in funeral homesHealthcare settings using formaldehyde-based disinfectants

What to Do Now

01Conduct formaldehyde air monitoring at all workstations where formaldehyde-containing products are used, manufactured, or processed. Monitoring should include both time-weighted average measurements for comparison against the WEL and short-term exposure measurements to assess peak concentrations during specific tasks such as opening formalin containers or pressing resin-bonded boards.

02Upgrade ventilation systems in laboratories, manufacturing areas, and timber processing facilities. Fume cupboards in laboratories must achieve a minimum face velocity of 0.5 m/s with the sash at working height. Manufacturing facilities should install local exhaust ventilation at emission points such as press lines, resin mixing stations, and board cutting operations.

03Evaluate product substitution opportunities. Formalin-free tissue fixatives are available for many pathology applications. Low-emission adhesive systems for timber products reduce off-gassing during and after pressing. Water-based and formaldehyde-free textile finishing agents can replace traditional formaldehyde-based treatments for many fabric types.

04Implement health surveillance for formaldehyde-exposed workers including baseline and periodic lung function testing, nasal examination, and symptom questionnaires. Workers in resin manufacturing and pathology laboratories with regular exposure above the action level should receive annual health monitoring as a minimum.

05Review storage and handling procedures. Formaldehyde solutions should be stored in ventilated cabinets or dedicated storage areas with local exhaust. Containers must be kept sealed when not in use. Dispensing operations should use closed transfer systems where practicable. Spill response procedures must account for the vapour hazard from spilled formalin solutions.

Monitoring Method

Personal air sampling using DNPH-coated silica gel sorbent tubes with a calibrated pump at 0.1 to 1.5 L/min. Analysis by HPLC with UV detection following NIOSH Method 2016 or AS 2365.5. Direct-reading photoionisation detectors can supplement tube sampling for real-time exposure assessment but are not specific to formaldehyde and may overestimate in mixed vapour environments.

Affected Industries

Construction →Printing →

Manage Formaldehyde Below the New 0.3 ppm Limit

EHS Atlas tracks formaldehyde monitoring data, manages health surveillance for exposed workers, and documents ventilation system maintenance and testing records.