atmosphere in scientific meaning is 大气层、大气、空气圈。 example: 大气污染很严重。=The pollution in atmosphere is extreme. atmosphere used in daily life with not talking about any scientific things is 气氛、氛围(used for describing the surrounding of people)。 example: 今晚的气氛／氛围真好。 = The atmosphere in here tonight is great. 气氛／氛围 not equal to 大气层、大气 even they are the same word in English

宽松的环境； 轻松的氛围；让人 放松的气氛

/幽閑/逍闲/輕鬆/的氣氛

（很）輕鬆的氛圍