💨 Why is ventilation important?

Good air needs to move! When we stay in a closed classroom for too long:

• CO₂ levels increase

• Oxygen levels decrease

• We feel sleepy, lose focus, or get headaches

Fresh air helps us stay alert, healthy, and happy.

⏰ When and how should we ventilate?

• Open windows during every break.

• Try 5–10 minutes every 45 minutes.

• Cross-ventilation works best (windows on opposite sides of the room).

🔍 Activity: Open Window Experiment

1. Use a CO₂ meter (if available) or just observe.

2. Check how students feel before and after opening the windows.

3. Record observations like this:

Then discuss: when do you feel best in class?

🧠 What did you learn?

• Air must be refreshed regularly.

• A simple action like opening the window can improve attention and well-being.

• Every student can help keep the air fresh.