Automotive is not one technology
An automotive operation may mean an assembly plant, interior parts production, paint shop, welding shop, press shop, textile bonding, flame lamination, foam parts production, plastic covering, lamination, or final assembly. From an environmental and occupational hygiene perspective, it is therefore not one universal operation type.
In one hall, chemical substances, VOC, dust, welding fumes, noise, heat, odorous substances, and local extraction may coexist. For some operations, workplace air and job categorisation are the main topic. For others, air emissions, operating permit, exhaust measurement, noise study, or operating records are addressed.
For an automotive operation it is not enough to write "production of automotive parts". To design measurement, specific activities must be distinguished: painting, bonding, flame lamination, PUR foams, welding, grinding, drying, ventilation, and handling of chemical preparations.
What is typically measured and assessed
In automotive, several measurement types are most often combined. One measurement usually does not answer all questions. A different approach is needed for employees' workplace air, for emissions at the exhaust, and for noise around the site.
| Area | What is usually assessed | Typical purpose |
|---|---|---|
| workplace air | chemical substances, dust, isocyanates, aldehydes, VOC, metals | regional public health authority, job categorisation, health protection |
| air emissions | TOC, VOC, TSP, NOx, CO, exhausts, filtration | regional authority, CEI, operating permit |
| noise | technology, HVAC, compressors, fans, traffic | noise study, commissioning, complaint |
| operating records | chemical substance consumption, VOC, operating hours, filters | demonstration of compliance |
| documentation | operating rules, expert opinion, dispersion study | operating permit, technology change |
Practically important: measurement in workplace air and emission measurement at the exhaust are two different matters. The first addresses what the employee breathes. The second addresses what the operation releases into outdoor air.
Painting and VOC
Painting is one of the most common automotive activities linked to VOC emissions. Volatile organic substances may be released from coatings, solvents, thinners, cleaning agents, degreasers, and other auxiliary preparations.
For paint shops, total designed consumption of organic solvents, exhausts, overspray filtration, possible VOC abatement equipment, and operating records are mainly assessed. Standard overspray filtration captures mainly solid coating particles but does not automatically mean VOC removal.
| Painting topic | Why it matters |
|---|---|
| organic solvent consumption | determines source classification and obligations |
| TOC / VOC | main indicators of organic emissions |
| overspray filtration | limits solid particles and protects technology |
| exhausts | measurement location and emission discharge point |
| gun cleaning | often a significant solvent source outside painting itself |
| VOC balance | basis for operating records and control |
For the work environment, painting mainly involves employee exposure to solvents, coating aerosols, and possibly isocyanates or other components per safety data sheets. Measurement scope is therefore not designed from the paint name but from its composition, application method, and actual work duration.
Bonding, covering, and flame lamination
Bonding and flame lamination are typical in automotive for interior parts, coverings, panels, headliners, door inserts, or damping elements. For workplace air and emissions it matters whether solvent-based adhesives, water-dilutable adhesives, hot-melt adhesives, reactive systems, or isocyanate-containing adhesives are used.
During bonding, highest exposure often does not occur evenly across the shift. It may arise during application, opening packaging, equipment cleaning, heating, curing, or work in poorly ventilated areas.
Decisive questions for measurement design:
- what adhesive is used,
- whether it contains organic solvents,
- whether it is heated,
- whether it is applied manually, by spraying, roller, or in a line,
- how long the worker is at the exposure source,
- whether the workplace is locally extracted,
- whether vapours are discharged by exhaust into outdoor air.
For flame lamination and covering, adhesive, textile, foam, plastic part, temperature, and pressure are often combined. The combination of materials and temperature may determine whether general VOC, specific organic substances, aldehydes, or other substances per technology will be measured.
PUR foams and thermal processes
PUR foams are used in automotive for seats, interior parts, seals, acoustic parts, or insulation layers. Depending on technology, foam production, cutting, bonding, pressing, flame lamination, thermal forming, or flame lamination may be addressed.
With PUR foams, a cautious approach is needed. Hazardous substances are not estimated from the commercial material name but from process chemistry, safety data sheets, and temperature conditions. In some operations isocyanates, amines, aldehydes, VOC, or thermal decomposition products may be relevant. Elsewhere dust from cutting and grinding foams or odour load may be the main topic.
| PUR foam process | Possible measurement topic |
|---|---|
| cutting and forming | dust, particles, local extraction |
| foam bonding | VOC, adhesive components, workplace air |
| flame lamination | products of thermal action, odour, ventilation |
| pressing and heating | VOC, aldehydes, or other substances depending on material |
| PUR system production | isocyanates, amines, reactive components, ventilation |
In practical terms: for PUR foams it is not enough to say generally "we measure VOC". Sometimes specific substances arising from the process, temperature, safety data sheets, and experience with the technology must be targeted.
Welding, grinding, and metals
Welding is common in automotive especially for metal structural parts, frames, reinforcements, holders, or fixtures. It may be manual welding, robotic welding, spot welding, MIG/MAG, TIG, or other methods. Workplace air mainly assesses welding fumes, fine particles, and metals.
For welding it is essential to distinguish base material, filler material, and surface treatment. Different exposure may arise when welding ordinary steel, stainless steel, aluminium, or galvanised parts. If welding is combined with grinding, grinding dust and metal content in dust may also be significant.
For larger welding shops, air protection regime may also need assessment. If welding is extracted and discharged by exhaust into outdoor air, alongside workplace air, TSP emission measurement, filtration, exhausts, and possibly operating permit may be addressed.
Chemical substances in workplace air
Measurement of chemical substances in workplace air is designed from safety data sheets, work procedure, exposure duration, ventilation, and PEL and NPK-P limit values. One "typical" substance is not enough. For mixtures, several components and their combined effect may need assessment.
| Basis | Why it is needed |
|---|---|
| safety data sheets | identify possible hazardous components |
| work procedure | shows when substance enters the air |
| shift length | determines whole-shift exposure |
| work-time snapshot | enables time-weighted average calculation |
| ventilation and extraction | fundamentally affects concentrations |
| representative shift | determines usability of results |
In automotive operations, different products, materials, and work regimes often alternate. It is therefore important to select a shift that corresponds to real and significant exposure. Measurement on a day when the line runs different material or the risky operation is not performed may be unusable for job categorisation.
Air emissions and exhausts
Air emissions are addressed where pollutants are discharged by exhaust into outdoor air. In automotive this may be paint shops, dryers, degreasing, bonding, flame lamination, welding shops, grinding workplaces, combustion sources, boiler plants, backup sources, or process HVAC.
Most important is correctly assigning the exhaust to the specific technology. In practice the problem is often several HVAC branches in one hall, some exhausts serving only ventilation and some removing process emissions. For operating permit and emission measurement it is necessary to know what each exhaust removes.
For emissions the following are usually addressed:
- source classification under the Air Protection Act,
- measurement location on the exhaust,
- emission limits,
- TOC/VOC for organic solvents,
- TSP for dust, grinding, or welding,
- NOx and CO for combustion sources,
- operating records and input substance consumption.
For paint shops and bonding processes, VOC balance is often important. For welding and grinding, solid particle filtration matters. For combustion sources, rated thermal input, fuel, and operating regime decide.
Noise in automotive operations
Noise in automotive usually does not come from one source. Presses, fans, compressors, extraction, conveyors, robotic cells, welding, grinding, HVAC units, loading, traffic, and material handling all contribute.
For the work environment, employee noise exposure during the shift is measured. For the surroundings, noise penetrating outside the site to protected outdoor spaces of buildings is assessed. The same technology may therefore be addressed in two different ways.
| Noise area | What is assessed |
|---|---|
| occupational noise | employee exposure during the shift |
| outdoor noise | operation impact on surrounding protected spaces |
| technological noise | machines, lines, fans, compressors |
| traffic noise | HGV arrivals, dispatch, handling equipment |
| impulsive or tonal components | possible increase in noise annoyance |
For new lines, production expansion, or operating time changes, noise should be addressed already in the project. Retrofit soundproofing of fans, exhausts, doors, or light envelope cladding is often technically and financially more difficult.
Most common mistakes in automotive operations
The most common mistake is too general measurement brief. The operator requests "chemistry measurement" but without safety data sheets, technology description, and work-time snapshot the correct scope cannot be determined. Similarly "emission measurement" is not enough if it is unclear which exhaust removes which technology.
For painting and bonding, cleaning agent consumption is often underestimated. For flame lamination and PUR foams, temperature effect on released substances is sometimes not addressed. For welding only dust is measured but metals are omitted. For noise, machines inside the hall are assessed but outdoor fans, compressors, exhausts, or operation with open doors are forgotten.
How to prepare documentation for measurement or assessment
Well-prepared documentation significantly speeds up measurement design. Not everything needs to be perfect immediately, but without a basic operation description measurement scope is only an estimate.
For first assessment it is suitable to prepare mainly technology description, list of chemical preparations used, safety data sheets, operating regime, shift length, number of workers, exhaust schematic, extraction data, filtration equipment information, traffic, and any requirement from the regional public health authority, regional authority, or CEI.
Then it can be distinguished whether workplace air measurement, emission measurement, noise study, dispersion study, operating rules, VOC balance, expert opinion, or operating permit change is needed.
Summary
An automotive operation may include painting, bonding, covering, PUR foams, flame lamination, welding, grinding, combustion sources, process exhausts, and noisy production lines. Workplace air, chemical substances, VOC, dust, metals, air emissions, and noise are therefore often addressed simultaneously.
The correct approach begins with distinguishing specific technologies and operating regimes. Employee exposure in the breathing zone is assessed differently from emissions at the exhaust and from noise spreading to the surroundings. Quality measurement and documentation should answer the specific question of the authority or operator, not merely "measure something" formally.
Send us a description of the automotive operation, list of technologies, safety data sheets of preparations used, extraction and exhaust schematic, operating time, information on work activities, and any requirement from the regional public health authority, regional authority, or CEI. We will propose a suitable scope of workplace air measurement, emissions, noise, or follow-on permitting documentation.
Factual basis of the article
The article is based mainly on these regulations:
- Government Regulation No. 361/2007 Coll., setting conditions for health protection at work,
- Decree No. 432/2003 Coll., on job categorisation,
- Act No. 201/2012 Coll., on air protection,
- Decree No. 415/2012 Coll., on permissible pollution levels and their determination,
- Government Regulation No. 272/2011 Coll., on protection of health from adverse effects of noise and vibration.
Government Regulation No. 361/2007 Coll. sets hygienic limits for chemical substances and dust in workplace air, including the PEL and NPK-P principle, and requires effective ventilation and local extraction at the source of chemical substances, mixtures, or dust. Act No. 201/2012 Coll. and Decree No. 415/2012 Coll. are the basis for assessing air emissions, sources using organic solvents, combustion sources, welding, filtration, exhausts, and emission measurement.