New car smell

Key takeaways

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

Reference excerpt

The new car smell is a scent that is commonly encountered in the interiors of new automobiles and other vehicles. The smell is caused by gases emitted from various manufactured materials, such as leather, plastics and textiles. Some people find the smell pleasant, which has led some automobile manufacturers to mimic the desired scents and utilize them to attract customers in show rooms. However, concerns have been raised about the potential health risks of the chemicals associated with new car smell. For example, a study in 2023 found that formaldehyde and acetaldehyde gases exceeded Chinese government safety standards in new car interiors, and researchers recommended that new car owners drive with windows open.

Chemical composition Both the scent and its origins vary among different kinds of cars, depending on the materials found in the interior—for example, leather versus cloth seats. Typically, however, most of the interior of an automobile consists of plastic held together with a number of adhesives and sealers, and such materials are known to release volatile organic compounds via off-gassing. These fumes are generally attributed to mixtures of many different gases as well as plasticizers, (although DEHP, widely used in PVC, is not very volatile). Researchers tested more than 200 U.S. vehicles of model years 2011–2012 for chemicals such as organobromine compounds (associated with brominated flame retardants, or BFRs), organochlorine compounds (e.g., polyvinyl chloride, or PVC), and heavy metals that off-gas from various parts such as the steering wheel, dashboard, armrests, and seats. It is recommended to keep new cars well-ventilated while driving, especially during the summer. A 1995 analysis of the air from a new Lincoln Continental found over 50 volatile organic compounds, which were identified as coming from sources such as cleaning and lubricating compounds, paint, carpeting, leather and vinyl treatments, latex glue, and gasoline and exhaust fumes. An analysis two months after the initial one found a significant reduction in the chemicals. The researchers observed that the potential toxicity of many of these compounds could pose a danger to human health. In a 2005 study, over sixty chemical compounds were identified inside the interiors of four tested vehicles, with the total volatile organic compound levels in one vehicle reaching 7,500 micrograms per cubic meter. Concentrations decayed by approximately 90% over a three-week period. In some instances, the odor results from a manufacturing defect. According to official documents of Bentley Motors (BT26), an "obnoxious odor" in Bentley cars for model years 1999–2002 was traced to a rust inhibitor. In some cultures, e.g. the Chinese culture, the new car smell is not considered desirable and manufacturers work to eliminate it.

Health hazards The chemicals responsible for new car smell may pose health risks to the occupants of new vehicles. A two-year study released in 2001 by the CSIRO in Australia found several health problems associated with these chemicals. CSIRO research scientist, Dr. Stephen Brown, reported anecdotal accounts of disorientation, headache, and irritation in some drivers of new cars. He measured pollutant levels in new cars that were sufficient to cause similar effects within minutes in controlled experiments by other researchers. Chemicals found in the cars included the carcinogen benzene, two other possible carcinogens cyclohexanone and styrene, and several other toxic chemicals. A more recent study in Japan found that the volatile organic chemicals in a new minivan were over 35 times the health limit the day after its delivery. After four months, levels had fallen under the limit, but they increased again in the hot summer months, taking three years to permanently remain below the limit. The limits were set by the Japanese health ministry in response to more car owners suffering from sick building syndrome. A Daily Telegraph article on the study described the enjoyment of new car smell as "akin to glue-sniffing". The most common side effects of the new car smell are headaches, sore throats, nausea, and drowsiness.

Other studies However, a study in 2007 showed no toxicity from new car odors in lab grown cells, though odors did trigger an immune system reaction.

See also Indoor air quality Sensory branding

References

Further reading Nick Kurczewski (July 10, 2021). "The Science of the New-Car Smell". Car & Driver.

Worked examples

Example 1 — a first encounter with New car smell

Start with the simplest possible case. Write down what New car smell 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 New car smell 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 New car smell 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 New car smell

In research: New car smell 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 New car smell 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: New car smell is common in secondary-school and first-year university syllabi. It links to neighbouring topics Air pollution, Car culture, Car ownership, so understanding it makes those chapters shorter.
In everyday life: Look for New car smell 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.

How to study New car smell in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what New car smell 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 New car smell out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is New car smell in simple terms?

The new car smell is a scent that is commonly encountered in the interiors of new automobiles and other vehicles. The smell is caused by gases emitted from various manufactured materials, such as leather, plastics and textiles.

Why does New car smell 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 New car smell?

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 New car smell.