Topic: safety prevention

In this Dec. 1, 2015 photo, a woman wears a mask to protect herself from pollutants near Tiananmen Gate on a heavily polluted day in Beijing. Episodes of nauseating smog lasting several days has become part of wintertime in the Chinese capital, and for many Beijing residents face masks have become a routine cold-weather accessory, along with hats and gloves. (AP Photo/Andy Wong) (AP)

Only some masks protect against toxins

Samantha Young, Ana B. Ibarra - KFF Health News