CLEVELAND — Major League Baseball officials postponed the series opener between the Cleveland Guardians and Pittsburgh Pirates on Friday because of poor air quality, as the fallout from Canadian wildfires continues to create unhealthy conditions in the Midwest and Northeast regions of the U.S.Team officials joined a call with the league office at 4:30 p.m. on Friday to talk through the final decision. The teams will reconvene at Progressive Field on Saturday for a split doubleheader, with hopes that the hazy, smoky environment will relent.MLB is assessing the air quality at several games on Friday night. The Commissioner’s Office has authority to postpone, call or suspend a game due to issues related to Air Quality Index (AQI). The league consults with the players union, as well as the teams and medical and independent weather experts. Both the Pirates and Guardians conducted brief activity on the field Friday afternoon, but neither held a normal, full batting practice session. Beneath a thick, gray sky, Guardians manager Stephen Vogt hit grounders to his infielders before conferencing with team president Chris Antonetti and other department figureheads. Pirates pitchers played catch in right field until league officials, who had final say because these teams only meet once this season, moved the game to Saturday.