Some of the more dangerous pollutants are ultra-fine particles (less than 100nm in size). I wonder how effective these masks are for trapping these particles. I can only find information on how well they trap particles larger than 100nm.
My dad has idiopathic pulmonary fibrosis or IPF it's probably from breathing in small particles over the years which causes scarring of lung tissue. Although the idiopathic part means how it occurs is not known for sure. He worked a blue collar job and often breathed in dust from various things.
Lungs are only for air don't mess with your lungs!