This reply
Sting mark this message contains misinformation
originally written by Sting
天氣熱樹下確實會產生臭氧但濃部"不足為害"
並沒有如標題<天氣熱千萬別在樹下乘涼>所言的嚴重

References

http://www.uho.com.tw/rorw.asp?year=2011&mon=8&id=444

35度C大熱天 該不該在樹下乘涼? - uho優活健康網

流傳原文:35℃樹下乘涼傷肺,釋10倍芬多精混廢氣成臭氧,請大家留意 ! 入夏以來天氣酷熱,溫度頻創新高,有研究發現,氣溫超過攝氏35度C時,樹木會大量釋放異戊二烯和單一芬多精,這兩種物質一旦和空氣污染物結合會產生臭氧,吸入後會引發咳嗽、氣喘甚至呼吸困難,醫師提醒在炎夏的都會區,民眾不宜坐在樹下乘涼。林口長庚醫院毒物科主任林杰樑受訪說:「一般人都有大樹下好乘涼觀念,但在都會區可千萬不要這麼做!」

http://www.uho.com.tw/rorw.asp?year=2011&mon=8&id=444

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