現代では、雨の匂いのもとは二種類あると考えられています。
一つはペトリコール（ギリシア語で「石のエッセンス」の意）という物質。これは雨が降らない間に植物が土壌に発する油だそうです。雨が降る直前、湿度が高くなると鉄分と反応してにおいがしはじめ、実際に雨が降り始めると油は流されてにおいもなくなってしまうとのこと。まさに雨の匂いの性質にどんぴしゃです。
もう一つはジオスミン。「大地のにおい」という意味だそうです。湿った土壌中の細菌が出す物質で、雨の多い地域での雨の匂いの原因と考えられています。いろいろなものに含まれており、大雨のあとの水道水のカビ臭いにおいや、川魚のにおいのもともジオスミンだそうです。
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