Which gas is NOT responsible for green house affect – a) Carbon monoxideb) Ozonec) Nitrous oxided) Nitrogen

**Core Concept:** Greenhouse gases are substances that absorb and emit radiation within the thermal infrared range, leading to the trapping of heat in the Earth's atmosphere and contributing to global warming and climate change. The main greenhouse gases are carbon dioxide, methane, and water vapor. Nitrous oxide and ozone are also greenhouse gases, while nitrogen is not.

**Why the Correct Answer is Right:** Nitrogen (option D) is the most abundant gas in Earth's atmosphere (~78%) and does not absorb or emit infrared radiation within the thermal range, making it irrelevant for the greenhouse effect.

**Why Each Wrong Option is Incorrect:**

Option A (Carbon monoxide) is incorrect because it is a greenhouse gas due to its ability to absorb and emit infrared radiation, contributing to the greenhouse effect.

Option B (Ozone) is incorrect because ozone is a gas that absorbs and emits infrared radiation within the thermal range, contributing to the greenhouse effect.

Option C (Nitrous oxide) is incorrect because nitrous oxide is a potent greenhouse gas that absorbs and emits infrared radiation within the thermal range, contributing to the greenhouse effect.

**Clinical Pearl:** Understanding the greenhouse gases is crucial in addressing climate change and its impact on public health, environmental health, and global warming.

**Correct Answer:** Nitrogen (D) is the correct answer as it is not a greenhouse gas and does not contribute to the greenhouse effect.