A tech team in China's Chongqing municipality has claimed it has invented the world's first wearable air purifier, a tech blog said.

The new equipment looks like a headset, with an attached air outlet below the nose. The team leader Xu Zongyan said smog masks make people breathe hard and may pose risks of secondary pollution, let alone its inaesthetic aspect.

"Thus we reduce face coverage to the absolute minimum," he added.

The device can remove as much as 99.9 percent of PM 2.5, the main pollutant in the air and 90 percent of formaldehyde, according to the team. Its filter cartridge needn't to be replaced, as it is washable.

The constant air volume offered by the device reaches three cubic meters per hour, twice the amount of air inhaled by an average breath.

While its battery enables the euipment to work for six hours, the team said it is trying to prolong this time to ten hours.

With a high precision sensor, the device can be used to test air quality and users can check real-time data on an app.

What's more, the device is able to perform intelligent management via controlling household air purifiers and conditioners.

The team is currently seeking investment for mass production, the blog said.