Building material selection: Brick or aerated concrete - Sound assessment on the topic

It was called brick

With or without filling, however, makes a significant difference; you should investigate that further.

but there is a slope, I think the building will be at most one floor above street level

If the school and the state road lie above the house, that is basically advantageous, but the wind direction also plays a role.

School below - state road partially slightly above, partially behind earth embankment

We currently have a house made of aerated concrete and would rather build with bricks next time for sound insulation. It depends on how sensitive one is to noise, but especially very low frequencies can always be faintly heard from outside.

Hollow bricks transmit sound between the floors, filled ones would be worth an extra charge to me. Do you already have a floor plan with orientation and placement on the property for us? Is the corridor layout aligned to the north? Then the bedrooms could be planned away from the main road.

Do you already have a floor plan with orientation and placement on the plot for us?

Here is a north-oriented map...
We have parcel 9 - but will align the building like 10

The garage will stand on the right at the boundary. We are currently waiting for floor plan proposals

We currently have a house made of aerated concrete and would prefer to build with brick next time for better soundproofing.

How about "the third party who laughs," since you are now moving closer to a pumice area?