science

Indicative limit value

Indicative limit value is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Indicative limit value rather than just read about it. In short: In the law of the European Union, indicative limit values, more exactly indicative occupational exposure limit values (IOELVs), are human exposure limits to hazardous substances specified by the Council of the European Union based on expert research and advice. They are not binding on member states but must be taken into consideration in setting national occupational exposure limits.

Key takeaways

Indicative limit value belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Indicative limit value to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Indicative limit value from memory before moving on to harder problems.

Reference excerpt

In the law of the European Union, indicative limit values, more exactly indicative occupational exposure limit values (IOELVs), are human exposure limits to hazardous substances specified by the Council of the European Union based on expert research and advice. They are not binding on member states but must be taken into consideration in setting national occupational exposure limits. Some member states have pre-existing national limits lower than the IOELV and are not required to revise these upwards. In practice, most member states adopt the IOELV but there are some variances upwards and downwards.

Legal basis A system of IOELVs was first introduced in 1980 by directive 80/1107/EEC but the first list of 27 substances was not created until directive 91/322/EC in 1991. Member states had until 31 December 1993 to implement national limits. This first list was amended by directive 2006/15/EC in 2006 which transferred 10 of the 27 to a different regulatory regime. A second list was defined in directive 96/94/EEC but this was repealed by directive 2000/39/EC. In 1998, directive 80/1107/EEC was repealed and replaced by a new regime under the chemical agents directive (directive 98/24/EC). The directive defines occupational exposure limit value as "the limit of the time-weighted average of the concentration of a chemical agent in the air within the breathing zone of a worker over a specified reference period." Article 3 of the directive led to the creation of the Scientific Committee on Occupational Exposure Limit Values to advise the European Commission. There have subsequently been two directives establishing further lists of IOELVs: 2000/39/EC and 2006/15/EC. As of 2008, the IOELVs under directive 91/322/EC remain in force but under review. A third list of IOELVs, now under directive 98/24/EC, is expected in the first half of 2008.

References

Bibliography Dikshith, T. S. S.; Diwan, P. V. (2003). Industrial Guide to Chemical and Drug Safety. Wiley-IEEE. pp. pp189–191. ISBN 0471236985. (Google Books) European Commission. "Occupational Exposure Limits and Biological Limit Values". Health and Safety at Work. Employment and Social Affairs. Archived from the original on 2008-04-16. Retrieved 2008-04-24. European Commission. "Unofficial consolidated list of the IOEVLs". Employment and Social Affairs. Retrieved 2014-11-06. Walters, D.; Grodzki, K. (2006). Beyond Limits? Dealing with Chemical Risks at Work in Europe. Emerald Group Publishing. ISBN 0080448585. (Google Books)

Worked examples

Example 1 — a first encounter with Indicative limit value

Start with the simplest possible case. Write down what Indicative limit value claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Indicative limit value before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Indicative limit value ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Indicative limit value

In research: Indicative limit value appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Indicative limit value in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Indicative limit value is common in secondary-school and first-year university syllabi. It links to neighbouring topics European Union law, Occupational safety and health, Toxicology, so understanding it makes those chapters shorter.
In everyday life: Look for Indicative limit value outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Indicative limit value in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Indicative limit value means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Indicative limit value out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Indicative limit value in simple terms?

Why does Indicative limit value matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Indicative limit value?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Indicative limit value.