निम्नलिखित में से कौन वायु प्रदूषण, विशेष रूप से सल्फर डाइऑक्साइड के अत्यधिक संवेदनशील संकेतक के रूप में कार्य करते हैं?

If sewage water with a very high BOD is directly discharged into a river, the most immediate consequence would be:

Which combination of pollutants is primarily associated with raw, untreated domestic sewage discharge?

What is the primary ecological consequence of thermal pollution caused by discharging heated industrial effluents into natural water bodies?