The Padres' three-game series against the Mariners, originally scheduled to begin Friday in Seattle, has been moved to San Diego's Petco Park because of air-quality issues in Washington state.

The Mariners will be the home team for all three games, meaning the Padres could be in position to clinch their first playoff berth since 2006 while playing as visitors in their home ballpark.

The West Coast wildfires have caused air-quality problems in the Seattle area this week.

A two-game Giants-Mariners series scheduled for earlier this week in Seattle was postponed and moved to San Francisco, with the teams finishing it Thursday. That decision came after some players complained about smoky conditions Monday after the Mariners split a doubleheader with the Oakland Athletics.

With the move, the Mariners have three home game remaining on their schedule beginning next Monday against Houston.

According to AirNow.gov, the air-quality rating for Friday in Seattle is expected to be 149, which is deemed "unhealthy for sensitive groups." The air quality is projected to be much better Saturday and Sunday.

ESPN's Jeff Passan reported earlier this week that if the West Coast fires continue to affect Major League Baseball down the stretch, particularly with the ALDS and ALCS scheduled in California, the Phoenix area has emerged as the primary backup option if postseason games need to be moved because of air-quality problems.

Information from The Associated Press was used in this report.