I have a world in which there are two types of magic - let's call them Good and Evil. A side effect of using this magic is as follows: when Good magic is used, the air pressure around the user increases, while when Evil magic is used the air pressure around them decreases.

This allows for all kinds of interesting effects; heavy magic use would cause high winds, and long term constant presence of Good magic would probably make the area much more sunny, for example, while Evil magic would make the area rather wet.

The thing I'm stuck on is a reasonable explanation for why magic use would have this side effect. I'm not looking for science based answers, but I would love to have some kind of internal consistency rather than just handwaving the effect.

I've been thinking of some form of magical particles (octarons?) that are created/consumed by Good and Evil magic respectively, but that simply shifts the question of the interaction further down the line.

To clarify: I'm not interested (for the purposes of this question at least) in the source of the magic - all I'm looking for is a plausible mechanic for two types of magic to raise/lower air pressure as a side effect of magic use.

I have a world in which there are two types of magic - let's call them Red and Blue, and they're much alike, but polar opposites (see Rich Burlew's worldbuilding article for a good example of this kind of idea). A side effect of using this magic is as follows: when Red magic is used, the air pressure around the user increases, while when Blue magic is used the air pressure around them decreases.

This allows for all kinds of interesting effects; heavy magic use would cause high winds, and long term constant presence of Red magic would probably make the area much more sunny, for example, while Blue magic would make the area rather wet.

The thing I'm stuck on is a reasonable explanation for why magic use would have this side effect. I'm not looking for science based answers, but I would love to have some kind of internal consistency rather than just handwaving the effect.

I've been thinking of some form of magical particles (octarons?) that are created/consumed by Red and Blue magic respectively, but that simply shifts the question of the interaction further down the line.

To clarify: I'm not interested (for the purposes of this question at least) in the source of the magic - all I'm looking for is a plausible mechanic for two types of magic to raise/lower air pressure as a side effect of magic use.

I have a world in which there are two types of magic - let's call them Good and Evil. A side effect of using this magic is as follows: when Good magic is used, the air pressure around the user increases, while when Evil magic is used the air pressure around them decreases.

This allows for all kinds of interesting effects; heavy magic use would cause high winds, and long term constant presence of Good magic would probably make the area much more sunny, for example, while Evil magic would make the area rather wet.

The thing I'm stuck on is a reasonable explanation for why magic use would have this side effect. I'm not looking for science based answers, but I would love to have some kind of internal consistency rather than just handwaving the effect.

I've been thinking of some form of magical particles (octarons?) that are created/consumed by Good and Evil magic respectively, but that simply shifts the question of the interaction further down the line.

I have a world in which there are two types of magic - let's call them Good and Evil. A side effect of using this magic is as follows: when Good magic is used, the air pressure around the user increases, while when Evil magic is used the air pressure around them decreases.

This allows for all kinds of interesting effects; heavy magic use would cause high winds, and long term constant presence of Good magic would probably make the area much more sunny, for example, while Evil magic would make the area rather wet.

The thing I'm stuck on is a reasonable explanation for why magic use would have this side effect. I'm not looking for science based answers, but I would love to have some kind of internal consistency rather than just handwaving the effect.

I've been thinking of some form of magical particles (octarons?) that are created/consumed by Good and Evil magic respectively, but that simply shifts the question of the interaction further down the line.

To clarify: I'm not interested (for the purposes of this question at least) in the source of the magic - all I'm looking for is a plausible mechanic for two types of magic to raise/lower air pressure as a side effect of magic use.