Is it possible to scale particle effect in Unity 5?

I saw quite a lot of similar questions but they are 3-4 years old, so is it possible to do it in Unity 5?

Here is a small part of my script:

using UnityEngine;
using System.Collections;

public class Colisions : MonoBehaviour

    public GameObject explosion1;

    private GameObject explosion;

    void OnTriggerEnter(Collider other) // If object which has this script collides with any other object

        if(gameObject.tag == "Asteroid") // I'm setting different effects for different objects here
            explosion = explosion1;
            /* I want to scale particle effect here pseudo - explosion.scale += 2 */

        if (other.gameObject.tag == "Bolt") // If current object collides with bolt
            gameObject.GetComponent<Soul>().damage(other.gameObject.GetComponent<Bullet>().devast, other.gameObject.GetComponent<Bullet>().type); // Each object has a 'Soul' class attached, it holds settings and health, it also has damage function which calculates damage, here I send damage and attack type from a Bolt object

            if (gameObject.GetComponent<Soul>().health <= 0) // If current object has no health
                Destroy(gameObject); // This object gets destroyed
                Instantiate(explosion, transform.position, transform.rotation); // Here I add particle effect, but I want to scale it

            Destroy(other.gameObject); // Bolt is also destroyed here


Have a look at lines 18-19, there I want to scale a particle system, but I’m not sure if it’s possible.

Also suggestions on how to improve this script are welcome too.

Not 100% but heres how I would do it.

GameObject particle = Instantiate(explosion, transform.position, transform.rotation) as GameObject;
particle.transform.scale = new vector3 (x,y,z);

Thats how I would expect it to work, let me know how it goes.