Martin Scott earned Ross County their first win in nine games with the only goal at bottom-of-the-table Airdrie.
County went ahead in the 25th minute when Sean Higgins gathered a poor clearance and sent Scott clear to shoot below goalkeeper Stephen Robertson.
County's Michael Gardyne hit the crossbar and Robertson made some fine saves to keep his side in the game.
Airdrie's misery was complete when substitute Aime Koudou was sent off for a second bookable offence.
Airdrie Utd: Robertson, McKenna, Lovering, Taylor (Koudou 53), Christie (Tierney 79), McGowan, McDougall, McKeown, Twigg (McPhee 75), Holmes, Barrau. Subs Not Used: Watson, Hollis.
Sent Off: Koudou (90).
Booked: Holmes, Koudou, Lovering, McGowan.
Ross County: Samson, Irvine, McKinlay, Dowie, Walkie, McCulloch, Gardyne, Scott, Higgins (Gunn 83), Cowie, Robertson. Subs Not Used: Malin, Webb, Hooks, Ciani.
Booked: Higgins, McCulloch, McKinlay, Irvine.
Goals: Scott 25.
Ref: C Richmond