最終更新日:2022/12/24

A region is considered nonattainment of an air quality standard (NAAQS) if its estimated exceedance rate of the NAAQS is more than once per year over three years. Exceedances are counted in terms of days.

音声機能が動作しない場合はこちらをご確認ください
編集履歴(0)

Sentence quizzes to help you learn to read

編集履歴(0)

ログイン / 新規登録

 

アプリをダウンロード!
DiQt

DiQt(ディクト)

無料

★★★★★★★★★★