According to Reuters, people familiar with the matter said that China is considering the implementation of mandatory air quality regulations to protect the health of drivers. If car manufacturers want to import cars to China from other countries without similar regulations, it may increase costs.

People familiar with the matter pointed out that if China, the world's largest auto market, introduces new regulations on air quality in cars, then auto interior parts suppliers need to adjust their products to meet the new requirements.

According to the new regulations, new cars will be required to pass the in car environment test several hours after the doors are closed. Regulators will test levels of pollutants such as formaldehyde and benzene, said three people familiar with the matter, who declined to be named.

Officials also want to test the level of electromagnetic radiation inside the car, mainly because electric cars and gasoline vehicles use more electronic equipment. Some consumers are concerned about the radiation of these electronic devices, but an official of the China Association of automobile manufacturers said last year that the radiation would not cause harm to human health.

In 2011, China's environmental quality supervision agency issued the guidelines for air quality of passenger cars, but these standards are only suggestive and not mandatory.