Brighton took the lead at the Emirates Stadium when Leandro Trossard turned home a low cross from Enock Mwepu to finish a good move from the visitors.
Arsenal had struggled to create chances but thought they had levelled through a close-range effort from Gabriel Martinelli, only for a lengthy VAR check to cancel out his header.
Brighton doubled their lead through Mwepu’s low drive from the edge of the box following a neat interchange between Trossard and Moises Caicedo.
Dawson said: “He has been brilliant for the whole match and easily the best player on the pitch. His work rate and composure on the ball has been unbelievable.
“Trossard and Caicedo linked well and his cross came across and Mwepu’s finish was excellent. The technique and skill to side-foot beyond Ramsdale on the half volley was something else.
“A really good goal, it’s a long way back for Arsenal and well deserved.”
Check out the latest Premier League transfer speculation below...
1. Man United face late ten Hag competition
Manchester United may be closing in on appointing Erik ten Hag as their new manager but they face a late hijack from RB Leipzig. (De Telegraaf)
2. Juve want rid of Kean
Moise Kean is unlikely to stay at Juventus this summer, with the Italian club determined to get rid of the Everton man this summer. (Niccolo Ceccarini)
3. Chelsea make contact with Edwards
Chelsea have made contact with Arsenal striker Khayon Edwards over a possible summer move. (Goal)
4. Tarkowski still in demand
Leicester and West Ham continue to ‘keep a close eye’ on developments involving Burnley defender James Tarkowski. (TEAMtalk)