Start with high-confidence environmental chemistry books, then narrow by subgenre or adjacent topics.
Environmental Toxicology and Chemistry
Donald G. Crosby
Environmental Soil Chemistry
Donald L. Sparks, Balwant Singh
Organometallic Compounds in the Environment
P. J. Craig
Principles of Water Treatment
Kerry J. Howe, David W. Hand
Soil Chemistry
Daniel G. Strawn, Hinrich L. Bohn
Principles of Toxicology
Stephen M. Roberts, Robert C. James
Chemometrics and Cheminformatics in Aquatic Toxicology
Kunal Roy
The Devil's Element
Dan Egan
Chemtrails Exposed
Peter A Kirby
Hazardous Substances
Thomas Schupp
Green Chemical Processes
Mark Anthony Benvenuto, Larry Kolopajlo
Effect-directed Analysis of Complex Environmental Contamination
Werner Brack
Environmental Toxicology
Mohd. Salim Reshi, Darakhshan Javaid