Skip to main content

By Beijing Institute of Technology

A new study, published in PNAS Nexus, of volatile organic compounds (VOCs) emitted by new cars on hot summer days finds concerning levels of formaldehyde and other aldehydes.

Consumers are familiar with—and even drawn to—the “new car smell” produced as VOCs from carpets, upholstery, and other interior materials in newly manufactured passenger vehicles. These VOCs can cause a range of health effects, including headaches, inflammation of the eyes, nose and throat, fatigue, irritability, dry cough, lung disease, and disorientation.

Jianyin Xiong, Shaodan Huang, and their colleagues sought to capture the levels of VOCs in the passenger cabins of new cars on hot summer days given that climate change is increasing summer temperatures globally.

Data from several hot summer days, with outside air temperatures of 25.3 °C– 46.1 °C (77.5 °F–115 °F), showed high levels of formaldehyde, acetaldehyde, and hexaldehyde. The Chinese national concentration limit for formaldehyde in passenger vehicle cabins is 100 μg/m3. The authors found levels in the experimental car sometimes exceeding 200 μg/m3. The national limit for acetaldehyde is 50 μg/m3. Levels in the experimental car could reach 140 μg/m3.

A machine learning model of the data identified material surface temperature as the most important influence on in-cabin VOC concentrations. The authors produced a deep learning model to predict the concentrations of 12 typical VOCs in passenger vehicle cabins. According to the authors, the model could be used for in-cabin concentration prediction and exposure assessment, which could be integrated with the control system of intelligent cars.

More information: Rui Zhang, Minglu Zhao, Hengwei Wang, Haimei Wang, Hui Kong, Keliang Wang, Petros Koutrakis, Shaodan Huang, Jianyin Xiong, ‘Cabin air dynamics: Unraveling the patterns and drivers of volatile organic compound distribution in vehicles’, PNAS Nexus (vol. 3, Iss. 7; 2024); DOI: 10.1093/pnasnexus/pgae243 | Press Release/Material. Featured image credit: wirestock | Freepik

In South Africa, tiny primates could struggle to adapt to climate changeScience

In South Africa, tiny primates could struggle to adapt to climate change

By Daniel Strain, University of Colorado at Boulder In the “sky islands” of the Soutpansberg Mountains of South Africa, two closely related species of primate…
SourceSourceMay 8, 2024 Full article
On a mission to save our soilsNewsScience

On a mission to save our soils

Italian soil scientist Professor Fabio Terribile is on a mission to improve soil quality, with the help of EU funding and 19 partners across Europe.…
SourceSourceAugust 11, 2024 Full article
Satellite Image: The Cagayan River, the Philippines
Image of the day: The winding lifeline of the Cagayan RiverNews

Image of the day: The winding lifeline of the Cagayan River

The Cagayan River, the longest and most voluminous river in the Philippines, winds across the northern island of Luzon for over 350 kilometers. Originating in…
Muser NewsDeskMuser NewsDeskMay 18, 2025 Full article