Whether the exposure occurs indoors or outdoors the adverse health effects remain the same. The only difference is that indoors the concentration of the harmful chemicals, compounds, and particles is kept in and doesn't go away as quickly as outdoors.
Is outdoor exposure to secondhand smoke in public venues, such as parks, harmful to children?
Regardless of where the exposure takes place -- outside or inside, secondhand smoke poses health risks to children. The U.S. Surgeon General has found that there is no safe level of exposure.
Read more about secondhand smoke at www.epa.gov/indoor-air-quality-iaq/secondhand-smoke-and-smoke-free-homes.