OKAY! So my brain has begun to actually work again and I have an update for details on how this world will work.
The majority of the industrialized world has operates on a good bit of turn of the century equipment. In cities for transportation you have; horse and carriage, mobiles (cars), bikes (motorcycle), steam trains and the air ship. The wealthier you are the better equipment you have. You won't see a poor traveller with an automobile of any kind unless it was stolen or they used to have money and lost it all. Dress in the cities is also akin to that of victorian era fashion. It can vary on flashiness, modesty and so forth. You will find plenty of stone work and metal work all around.
In a specific territory of the world where the majority of elemental life resides it is a drastically different story. Much of the land is arid you will find more mud, clay and stone work. People prefer to travel by foot since they can use the ground to their advantage but it is not unheard of for them to have higher technology. Dress is light and layered, a mix of what you might have seen in ancient greece and India.
Weaponry can has a large spectrum. You have multi-chamber pistols, rifles, shotguns as well as short swords, daggers, and cross bows. There is heavy artillary but that is kept by military only! Elementals are able to manipulate any element to varying degrees, it is unlikely they are a master of everything since they are working with different types and amounts of mass.
If there are any further questions please let me know