Write the code to get values in the Arduino sofware.

Test the first sensor with an Arduino.

Then test the second sensor.

If it works, write the adapted code to get the values of both sensors at the same time.

Test both sensors.

Write a processing code to show the result.

As we did, you can choose to make an interface.

Think of the design and colors you want.

Built the device to make it transportable.

We choose to insert our components into polysterene and cover it with fabric.

We stick it to an armband.

It's done! Go check the pollution anywhere you want :)