Safety when working with a cleaning laser — laser classes, eyewear, the work zone and regulations

RC-Laser Team · 2 November 2026

Laser classes, Directive 2006/25/EC and the Polish 2010 regulation, eyewear chosen by wavelength and OD, ablation fumes and the work zone.

Laser classes: what they mean

Lasers are divided into classes under the standard PN-EN 60825-1: 1, 1M, 1C, 2, 2M, 3R, 3B and 4; they are described, among others, in a publication of the Polish occupational safety institute CIOP-PIB ^[4]. Class 1 is safe under normal conditions, while class 4 is hazardous to the eye and skin, including from diffuse reflections, and is often a fire hazard; for class 3B the direct beam is usually the hazard ^[4]. The Irish safety authority marks class 3B and 4 lasers as potentially hazardous ^[5], and the UK’s UKHSA points out that the higher the class, the greater the potential for harm ^[6]. We do not discuss the content of the standard itself because it is paid; we rely on publications that describe it.

The EU directive and the Polish regulation

Directive 2006/25/EC sets minimum health and safety requirements for workers’ exposure to artificial optical radiation, including laser radiation. It requires the employer to assess exposure and risk (taking into account, among other things, the laser classification and indirect effects such as temporary blinding, fire or explosion), to reduce risk to a minimum, to inform and train workers and to provide health surveillance ^[1]. In Poland this is regulated by the Minister of Labour and Social Policy’s regulation of 27 May 2010 on health and safety at work involving exposure to optical radiation (Dz.U. 2010 No. 100 item 643; consolidated text: Dz.U. 2013 item 1619) ^[2]^[3]. It covers laser and non-laser radiation, requires determining the exposure level and assessing risk taking into account the laser class under PN-EN 60825-1, and, where the permissible exposure may be exceeded, a written programme of organisational and technical measures ^[2]. The permissible exposure values are set by a separate act on harmful agents in the working environment ^[2]; we do not give them.

Risk assessment and the hierarchy of measures

The directive and the regulation put reducing risk at source and technical measures such as enclosures, interlocks and limiting exposure time first, with personal protective equipment meant to supplement them ^[1]^[2]. The CIOP-PIB publication describes the hierarchy similarly: enclosures, interlocks, key switches, emission indicators, beam stops and removal of reflective objects take precedence over personal protection ^[4]. The regulation also provides exemptions from further exposure assessment at low exposure when conditions are met, including for lower-class lasers used according to the manufacturer’s requirements ^[2]. Whether a specific device and workstation meet those conditions has to be assessed, not assumed.

Eye protection: wavelength, operating mode, optical density

The eye is the main target of the hazard, and the effect depends on wavelength and exposure time ^[7]. Protective eyewear is chosen by the laser’s wavelength, operating mode (continuous, pulsed) and power or energy; effectiveness is defined by optical density (OD), where each increase of 1 means ten times lower transmission. The standard for goggles and glasses protecting against laser radiation is PN-EN 207 ^[4]. The eyewear must match the wavelength of the specific laser, and sunglasses are no substitute for laser eyewear ^[4]^[7]. The required OD is calculated from the device’s parameters, so we do not give any value as universal. In a US Air Force study of a laser de-painting system (120 W, class IV), operators wore eyewear of at least OD 7 ^[8]; that describes a single workstation and is not a recommendation.

Work zone, marking and access

Places where the permissible exposure may be exceeded are marked and delimited, with access restricted where technically possible ^[1]^[2]^[4]. For industrial class 3B and 4 lasers the Irish authority recommends a delimited area with restricted access and interlocks ^[5], and the US OSHA manual a controlled area around the hazard zone ^[7]. The extent of the zone and the way it is marked follow from the assessment of the specific device; the sources cited give no universal distances.

Dust, fumes and fire

Laser processing can generate dust, ozone and other harmful substances, which are an additional hazard to the operator ^[4]. Measurement results differ and depend on the coating, the device and the extraction. In a laboratory study of a class IV laser (1064 nm, 120 W) on panels with aviation paints, with HEPA extraction, metals and hexavalent chromium were below occupational exposure limits and formaldehyde, NO, NO₂ and HCN were not detected; a noticeable odour was reported, however, which was not measured ^[8]. In a study of laser paint removal from automotive coatings, concentrations of PM1.0 and PM10 dust were measured that the authors describe as well above WHO guidelines, and they recommend ventilation and masks ^[9]. Neither result may be generalised: the first concerns one machine and one paint, and the second we know only from the abstract. A class 4 laser can also be a fire hazard ^[4]^[5]^[6]^[7].

Training, health surveillance and the limits of this text

The directive and the Polish regulation provide for informing and training workers and for health care ^[1]^[2]; the Irish authority considers training almost always necessary for class 3B and 4 lasers ^[5]. This text is an overview of sources, not legal advice: it does not decide whether a specific device and workstation meet the requirements, what eyewear, zones and ventilation are required, or what measurements must be taken. That calls for a risk assessment for the specific device and, in case of doubt, consulting a person qualified to make it, for example an occupational safety specialist. We describe no specific device or certification here.

This text is for information and is not legal advice. It concerns regulations in force in Poland and the EU; before relying on them, check the current wording in ISAP (isap.sejm.gov.pl) or EUR-Lex.

Sources

Sources as of 2 November 2026.