Which is the best way to decrease environmental tobacco smoke as a source of indoor polution?
i. don’t smoke.
ii. increase ventillation.
iii. smoke outdoors.

i only
ii only
i and ii only
i and iii only
ii and iii only

II and III only

Explanation:

You can't just stop people from smoking. Smoking outside or having more ventilated areas will help.

explanation:

daily refers to frequency, like weekly or monthly. take this medicine twice daily, once in the morning and again at bedtime. on a daily basis there refers to everyday life, to one's normal or usual behavior, activity, routine, or schedule, to the quotidien.