In a world on the brink of a devastating global crisis, "Parts Per Billion" follows the interconnected lives of three couples as they navigate love, loss, and hope in the face of an impending catastrophe. As tensions rise and uncertainty looms, each couple is forced to confront their deepest fears and make decisions that will shape their futures forever. With the fate of humanity hanging in the balance, these six individuals must find strength, courage, and resilience in the midst of chaos and uncertainty. "Parts Per Billion" is a gripping and emotional tale of love, survival, and the enduring power of the human spirit. Will they find a way to overcome the challenges that threaten to tear them apart, or will they be consumed by the darkness that surrounds them? Join us on this heart-wrenching journey as we discover the true meaning of love and sacrifice in a world on the brink of collapse.