Justin Bieber posts shirtless selfies while sporting medical mask during hiking trip

Justin Bieber Goes Shirtless, Sports a Medical Mask While Hiking in Los Angeles

It seems Justin Bieber has finally found his "purpose" -- combatting air pollution!

The 22-year-old singer took to Instagram to spread the word about the quality of air in Los Angeles while on a hike on Friday, with a shirtless selfie and a medical mask.

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"Air quality in la," he captioned a shirtless shot of himself wearing the mask over his mouth. "good thing I wore my mask !!"

It seems the Biebs figured out how to properly wear the mask just in time to take a little break from his hike. Moments later, he posted a photo of himself wearing the mask while writing in a notebook, presumably jotting down lyrics to his next single about the environment.

With a busy tour schedule and a new single, Bieber just isn't down to catch anything besides Pokémon.

See more photos of Justin Bieber through the years:

The Evolution of Justin Bieber
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The Evolution of Justin Bieber
Canadian pop megastar Justin Bieber (C) plays basketball with a young survivor of Super Typhoon Haiyan in Palo, Leyte province on December 10, 2013. Pop megastar Justin Bieber sang to and played basketball with young survivors of the Philippines' deadliest typhoon on December 10 after he flew into the disaster zone to boost an international relief effort. AFP PHOTO (Photo credit should read STR/AFP/Getty Images)
LOS ANGELES, CA - JULY 27: The winner of Champ of Charity singer Justin Bieber (L) and singer Cody Simpson onstage at the 2014 Young Hollywood Awards brought to you by Samsung Galaxy at The Wiltern on July 27, 2014 in Los Angeles, California. The Young Hollywood Awards will air on Monday, July 28 8/7c on The CW. (Photo by Frederick M. Brown/Getty Images for Variety)
The "Baby" singer headed straight to the salon for a new makeover ... this time going blonde! (Instagram)
LOS ANGELES, CA - AUGUST 23: Justin Bieber attends a VMA Pre-Party hosted by Chris Brown & Pia Mia featuring Bera on August 23, 2014 in Los Angeles, California. (Photo by Araya Diaz/Getty Images)
NEW YORK, NY - JAN 17: General view of a Justin Bieber for Calvin Klein Billboard located on Houston Street on January 17, 2015 in New York City. (Photo by Tomas/IMAGES/Getty Images)
LAS VEGAS, NV - MARCH 15: Singer Justin Bieber arrives at Omnia Nightclub at Caesars Palace to celebrate his birthday on the nightclub's opening weekend on March 15, 2015 in Las Vegas, Nevada. (Photo by Gabe Ginsberg/Getty Images)
CANNES, FRANCE - NOVEMBER 07: Singer Justin Bieber attends the 17th NRJ Music Awards ceremony at Palais des Festivals on November 7, 2015 in Cannes, France. (Photo by Marc Piasecki/WireImage)
LOS ANGELES, CA - JANUARY 18: Justin Bieber and Corey Gamble are seen in Beverly Hills, Ca on January 18, 2016 in Los Angeles, California. (Photo by Light Brigade/Bauer-Griffin/GC Images)

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Earlier this month, the "Sorry" singer and his pals played the popular game with a crowd of other Pokémon trainers in the streets of New York, and while he wasn't wearing a mask, he still went completely unrecognized.

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