There are many chemicals, including endocrine disruptors and toxins, that can impact fertility and reproductive hormones. A brief, non-exhaustive list:
Mustard gas (sulfur mustard), associated with more than 4x the risk of male-factor infertility
Pesticides
Lead and other heavy metals
Microplastics and petrochemicals
Research shows that sperm-producing people who work in the agriculture, herbicides, construction, machinist, plastic production, printing industry, tobacco processing, and welding industries may see a negative impact on their fertility, including reduced sperm count and increased risk of miscarriage and birth defects.