air air pollution from industrial emissions; rivers polluted from Uncooked sewage, heavy metals, detergents; deforestation; forest damage from air air pollution and ensuing acid rain; soil contamination from heavy metals from metallurgical crops and industrial wastesTrong su?t n?m th? k? cai tr? c?a Ottoman, ng??i Bulgaria ?ã t? ch?c nhi?u n? l?c