LAS VEGAS – It must be a sign of the times that an emerging category of consumer electronics involves mobile devices to combat air pollution.

A number of vendors at the annual CES trade show, which ended Sunday, showed off powered air-filtration face masks and portable pollution sensors. These were in addition to home air filtration systems at the show.

Silicon Valley Air Experts showed off its FitAir portable air cleaner, which the company has under development.

The device can be worn with a mask or be placed on a desktop or tabletop to create a personal clean air space of 3 square meters, CEO Yan Zhang said.

Used with a mask, the device delivers fresh air to your nose via a medical-grade rubber tube from a small fan and HEPA filter worn on an upper-arm band. The addition of the fan avoids the stuffy feel of a traditional mask. The filter traps smog, pollen and other airborne pollutants.

Lyon, France-based Wair also was at CES promoting a wearable air purifier.

Wair has developed fashionable “antipollution scarf” with a small fan in the scarf itself. It links to the company’s Supairman smartphone app that monitors pollution levels.

“We’re targeting bikers (in metro areas) because they ride in the middle of traffic,” Wair co-founder and CEO Caroline Van Renterghem said. Pregnant women and the elderly are other potential markets, she said.

Van Renterghem said she got the idea for the mask from when she was working in Paris and biking each day. She began experiencing respiratory problems and a doctor warned her that exposure to air pollution was bad for her health. She was dissatisfied with the scarves and masks she tried.

Also at CES, Plume Labs introduced a smart, connected mobile air quality tracker called Flow. The wearable device monitors air pollution indoors, outdoors and on the go. A companion smartphone app gets real-time data on what you breathe.

The tracker measures particulate matter and dust, exhaust fumes, ozone and household chemicals as well as temperature and humidity.