Drone Simulation using different environment parameters

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I am trying to simulate drone navigation in different environmental conditions like fog, rain, wind and varying light.

I have some doubts:

1. Whether changing the fog parameter in the <scene> section in the SDF file gives only a visual effect or a realistic effect of fog on the camera I am using and the drone navigation.

2. Is it possible to create wind, fog and rain effects on the gazebo.

3. I came across particle emitter in ignition gazebo. If I couldn't achieve the effects on Gazebo should I use Ignition Gazebo?

4. Is it possible to launch an fpv camera in the ignition gazebo?
   Really appreciate the help and guidance.

Note: I am using PX4 firmware