YOU SAID:
I was at the park because I wanted air.
INTO JAPANESE
空気が欲しかったので公園にいました。
BACK INTO ENGLISH
I was in the park because I wanted air.
INTO JAPANESE
空気が欲しかったので公園にいました。
BACK INTO ENGLISH
I was in the park because I wanted air.
That didn't even make that much sense in English.