Why rain caused falling hair

Nowdays, rain contains hydrate sulfure acid (hidrat asam sulfur) and hydrate nitrogen acid (hidrat asam nitrogen), as cause of using excess coal and petroleum. This rain called acid rain. Acid rain cause changing of nature of soil and effect pH of water in river, and this changing destroy the ecosystem. But this effect not just stop right there, but also effect our body, especially our head skin.
Acid rain has nature of destroying protein, so it has negative effect for our head skin.
This is the reason why rain is one of the factor of falling hair (so be carefull).
One more thing, falling rain after long dryness has higher acidity degree.