How to say "air" in Japanese

Choosing the right word
  • 空気くうきJLPT N4approx.Common
    nounThe general word for air as a substance: the air in a room, the air you breathe, air in a tire. It also covers 'atmosphere' in the physical sense.
    空気くうきは音おとの媒体ばいたいだ。↗
    The air is a medium for sound.
  • エアCommon
    nounThe katakana borrowing of 'air'. It chiefly appears within set expressions rather than as the ordinary word for the air you breathe; for that, 空気 is the word.
  • 干すほすJLPT N2approx.Common
    godan verb, transitive verbA verb, not the noun: it means to air or dry something, as when you hang out washing or bedding. Never use it where English has the noun 'air'.
    Please air the zabuton.
  • 大気たいきJLPT N3approx.Common
    nounAir in the scientific sense of the atmosphere: the mass of air surrounding the earth, as discussed in weather reports and science, rather than the air in the room.
    大気たいきが汚染おせんされつつある。↗
    The atmosphere is being polluted.
  • 宙ちゅうCommon
    nounSeldom the word you want for air itself: it really means midair or empty space, as with something floating or falling through the air.
    暖あたたかい日ひには手足てあしを伸のばしたり、仰向あおむけになって足あしを宙ちゅうに上あげたまま寝ねることもある。↗
    On warm days, bears stretch out or lie on their backs with their feet in the air.

For air as the gas we breathe use 空気; for the earth's atmosphere in science or weather use 大気; 「エア」 is the loanword mostly in set expressions; 「干す」 is the verb 'to air'; 宙 means midair.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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