🎯 Learning Objectives:

• Students will learn how to read values from air sensors installed in their classroom or accessed online.

• Understand measurement units and what defines safe vs. harmful levels.

📚 Lesson Content:

• Units of measurement:

  • ppm (parts per million) – used for gases like CO₂

  • µg/m³ (micrograms per cubic meter) – used for particulate matter (PM)

• Safe limit examples (WHO or national recommendations):

  • CO₂: optimal < 1000 ppm

  • PM2.5: safe < 15 µg/m³ (daily average)

• How values are displayed: graph, LED indicator, or app interface (red = poor, green = good)

🧠 Fun fact: High PM2.5 levels in the morning can be caused by traffic or nearby wood-burning stoves.

🧩 Interactive Activity:

• Real data analysis: Students receive a graph of CO₂ and PM2.5 values measured over a day in a classroom.

  • Questions: When is the CO₂ peak? What can be done to reduce it?

• Alternatively: use live sensor data from their own school (if available).