The Ganga River, a spiritual and physical lifeline for millions, faces an existential crisis from pollution, with Kanpur city representing its most critical and chronic hotspot. This industrial metropolis, famed for its leather tanneries and textile mills, contributes a massive, toxic load of chemical and biological contaminants to the river. This comprehensive review paper synthesizes decades of research to assess the magnitude and sources of pollution in the Kanpur stretch of the Ganga, and to evaluate its multidimensional effects on aquatic life, terrestrial animals dependent on the riverine ecosystem, and human health. The analysis reveals alarmingly consistent patterns: dissolved oxygen (DO) levels often plummet below 3 mg/L, biochemical oxygen demand (BDO) and chemical oxygen demand (COD) frequently exceed permissible limits by factors of 10-20, and heavy metals (Chromium, Lead, Cadmium, Mercury) and toxic organics are pervasive. The consequences for aquatic biota are devastating, including severe loss of biodiversity, dominance of pollution-tolerant species, bioaccumulation of toxins in fish, and large-scale fish kills. Terrestrial animals, especially livestock and wildlife consuming contaminated water, suffer from morbidity, reproductive failures, and heavy metal poisoning. For the human population, direct exposure through bathing, ritualistic practices, and indirect exposure via contaminated food and water leads to a high burden of waterborne diseases, dermatological conditions, and heightened risks of cancers, neurological disorders, and hepatic/kidney damage from chronic heavy metal intake. The review concludes that despite regulatory frameworks and intervention programs like the Namami Gange, pollution in Kanpur remains a complex, entrenched challenge due to inadequate infrastructure, enforcement gaps, and socio-economic dependencies on polluting industries. Urgent, systemic interventions prioritizing zero-liquid discharge, advanced sewage treatment, and a \\\"One Health\\\" approach integrating ecological and public health monitoring are recommended to reclaim the health of the river and the communities it sustains.
Dr Amit Kumar Awasthi (Thu,) studied this question.