Tar, pitch and bitumen
Coal tar originates from coal; coal-tar pitch remains after its distillation. Petroleum-derived bitumen is a different material despite possible visual similarity. USGS distinguishes coal-tar-based and asphalt-based coatings. Establish origin and composition through documentation or competent characterisation, especially for older materials. Colour, texture or an informal name alone cannot identify which material is present or justify transferring an assessment from another product.
Where exposure may occur
NCI identifies coke and aluminium production, foundries and manufacture or use of certain coatings and refractory products. This does not mean every current product in those sectors contains coal tar. Review formulations, existing materials and intended tasks. Removal or maintenance of historical material may need a different assessment from application of a modern product whose identity and composition are documented.
Why skin contact matters
These mixtures can contain carcinogenic compounds, including polycyclic aromatic hydrocarbons. NCI links occupational exposure with skin and other cancers; NIOSH also describes dermatitis and respiratory effects. Dermal exposure needs separate attention: contaminated tools, clothing and surfaces may maintain contact after visible emissions diminish. Control focused exclusively on air can leave this route unassessed and allow contamination to continue between tasks.
Measurement and interpretation
The laboratory needs the material identity and assessment purpose. Total dust mass, an extractable fraction and analysis of particular compounds are not interchangeable results. NIOSH distinguishes methods and fractions in its references. Retain method, analytes and conditions with results; do not compare numbers describing different fractions or convert a bulk-material measurement into an assumed concentration inhaled by the worker during a particular activity.
Reduce exposure during the task
Consider alternatives where appropriate and address emission and contact through work design. Depending on the operation, containment, extraction and methods limiting dispersion may be needed, supported by protection selected for the mixture. Include cleaning, clothing removal and waste management. The objective is to prevent task contamination moving into clean areas or remaining on the person after the main operation has ended.
Preserve a usable history
Record the material identified, its location, the people and tasks assessed and the measures verified. Traceability supports later reviews and professional health assessment. It does not automatically establish that an individual cancer arose from a particular exposure. Check applicable legal and surveillance criteria within their jurisdiction, without transferring United States limits or environmental measurements into general rules for the workplace.
