IoT Air Quality Monitor: A Vital Project for 2025

Air pollution is a major concern in cities across India. Building an Air Quality Index (AQI) monitor is not just educational—it's impactful.

What You Can Measure

| Sensor | Measures | | :--- | :--- | | MQ-135 | General Air Quality (NH3, NOx, CO2) | | PMS5003 | PM2.5 (fine particulate matter) | | DHT22 | Temperature & Humidity | | MQ-7 | Carbon Monoxide (CO) |

System Architecture

1. Data Collection: Sensors gather environmental data.
2. Processing: ESP32 reads sensor values and calculates AQI.
3. Display: OLED screen shows local readings.
4. Cloud Upload: Data is sent to ThingSpeak or Firebase.
5. Dashboard: Visualize historical data on graphs.

Calculating AQI

AQI is calculated based on specific pollutant concentrations. Different countries use different scales (India uses a 0-500 scale). The formula involves breakpoints and linear interpolation.

Why This Project Matters

• Raises awareness about local air quality.
• Demonstrates sensor fusion and data analytics.
• Can be expanded into a city-wide smart sensor network.

Explore Related Kits

• Arduino Weather Station
• Temperature and Humidity Monitoring