Sensor to detect smoke in ppm of smoke

Using Arduino Sensors
1

hi all,

I am making a outdoor smoke detection project, I cant find any other smoke sensor than MQ-2, please help me suggest any good sensor.

I need to use it at 3.3V or 5V , providing analog or digital output, interface with arduino and gives output in ppm of smoke.

Thank you.

2

Just out of curiousity: how does "ppm of smoke" work? What exactly does it measure?

3

There is no way to measure smoke mass, only its optical properties like opacity and backscatter.

The size of the smoke particles strongly affects the optical properties for a given mass density.