Role of NO & NO₂ in Smog & PAN Formation | Types | Lecture 3 | Chapter 12 | FSc 1st Year Chemistry

Role of NO & NO₂ in Smog & PAN Formation | Lecture 3 | Chapter 12 | FSc 1st Year Chemistry

In this lecture, we explain the role of nitrogen oxides (NO and NO₂) in the formation of smog, with special focus on photochemical smog and PAN (Peroxyacetyl Nitrate). This topic is extremely important for board exams, conceptual clarity, and environmental chemistry.

You will clearly understand how NO and NO₂ participate in atmospheric reactions, how sunlight triggers photochemical smog, and why PAN is considered a dangerous secondary pollutant.

📌 What You Will Learn in This Lecture:

✔ Types of smog (Photochemical smog & Classical / London smog)
✔ Role of NO (Nitric Oxide) in smog formation
✔ Role of NO₂ (Nitrogen Dioxide) in photochemical reactions
✔ Formation and importance of PAN (Peroxyacetyl Nitrate)
✔ Main components of photochemical smog (O₃, NO₂, PAN)
✔ Why photochemical smog occurs mainly in summer
✔ Environmental and health effects of smog
✔ Board-oriented explanation according to Punjab Textbook Board / PECTAA

🌍 Why This Topic Is Important?

Smog is a major environmental pollution problem in big cities. Understanding the chemistry behind NOx gases and PAN formation helps students connect textbook chemistry with real-life environmental issues.

This lecture is designed especially for: 🎓 FSc 1st Year students
📚 Board exam preparation
🧠 Concept-based learning
👨‍🏫 Teachers & academies

👍 Teaching Style:

✔ Simple English
✔ Step-by-step explanation
✔ Exam-focused points
✔ Easy chemical reactions
✔ Conceptual + board pattern coverage

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