“Throttled,” “Collided,” “Wrecked,” and “Redeemed” are books in the “Dirty Air Series” written by Lauren Asher. The series appears to focus on themes of romance, passion, and possibly sports or racing, as suggested by the titles and the term “Dirty Air,” which is a term used in racing to describe the turbulent air caused by a vehicle ahead.

The series follow the interconnected lives and relationships of characters in the racing world or explore the intense emotions and challenges faced by individuals in high-stress environments. As with many romance series, each book likely centers on a different couple and their unique journey towards love and redemption.