Particles spawn to fast - Phaser 3

[Christian981]

I am trying to make a snow effect on the main menu using the particle emitter but particles spawn way to fast.

I have this code:

        var particles = this.add.particles('snow');

        var emitter = particles.createEmitter({
            speedY: { min: 15, max: 40 },
            gravityY: 0,
            scale: 0.2,
            quantity: 1,
            lifespan: { min: 28000, max: 30000 },
            emitZone: { source: new Phaser.Geom.Line(-20, -100, 820, -100 )}
        });

And quantity is only one, so I do not know how to fix this.