Male infertility? - how to approach with your husband?

So we’ve been TTC for just under 12 months now and nothing. It’s so physically and mentally draining as we really do feel after 12 years together this is the next step to complete our family. I feel I need to be the one to raise the ‘talk’ about the fact one of us may have an infertility problem. I’ve been off the pill for 5 years and had regular periods like clockwork so have always felt surely I’m okay. But my partner does work with toxic fumes and I’m starting to think could this be affecting his sperm? How on earth do I approach the ‘talk’?! Are there sperm tests you can do at home? Or is it best to get in touch with a clinic to be tested? I suppose I’m just worrying about how he’ll react when I bring it up? Does anyone have any best ways to do it and best way to move forward? Thanks very much