Turtledove, Harry. The Case of the Toxic Spell Dump
What if: Magic works.
Summary: Adventures of an inspector for the US Environmental Perfection Agency.
Comments: A prequel in a sense is Thessalonica (Baen 1997), set during the decline of the Roman Empire. However, it seems even less allohistorical.
Published: Baen 1993 (0671721968BUY).
Original in: English.
Translation: Russian by M. Gitt as Delo o Svalke Toksicheskykh Zaklynaniy, AST 1997.