These areas constitute U.S
1A: Maximum extent, in an idiom (HILT) I like how the puzzle went for the idiom here, and then stayed idiomatic for the other (nearby) "maximum" answer: EVEREST (26A: Greatest potential accomplishment, metaphorically)
CADR reflects how much clean air the purifier can deliver per minute, which determines how many air changes per hour it can provide in your room
There was only one small mountain in the immediate neighborhood, and it was too rough and trailless for my father to permit me to climb it
You can also get cartons of cigarettes, which can have anywhere from 100-400 cigarettes in them
They said the safety claim, first made by independent scientists, had been 'widely publicized, notably by Public Health England and the Royal College of Physicians'