कोयला आधारित ताप विद्युत स्टेशन मुख्य रूप से निम्नलिखित में से किसे जोड़कर वायुमंडल को प्रदूषित करते हैं?

When the pH of rainwater is less than ______, it is called acid rain.

Burning of plastics, especially Polyvinyl Chloride (PVC), releases which of the following highly toxic substances into the atmosphere?

Which of the following specific chemical compounds is formed when sulphur dioxide reacts with atmospheric moisture during the sulphur cycle?