0d1cfec9_t_the_AQI__Ozone_and_Particles__FACT
[MYTH] Only long-term exposure to particle pollution causes health problems. [FACT] 
People have experienced health problems from exposure to particles over long periods (years) and from periods as short as 1- to 24-hours.
TV Weather - Myths and Facts about the AQI, Ozone and Particles
FACT