LOS ANGELES—All attendees at next month’s Super Bowl at SoFi Stadium will be given free KN95 masks and be required to wear them when not actively eating or drinking, the Los Angeles County Public Health director said. KN95 masks are designed to filter out at least 95 percent of particulate matter in the air. Fans attending the NFL’s championship game on Feb. 13 will also be required to show proof of vaccination or a recent negative test but there will be no capacity restrictions at the 70,240-seat venue in Inglewood. On Tuesday, the NFL and the county health officials said they would host a COVID-19 vaccination clinic and give out free tests at the Los Angeles Convention Center in the run-up to the game on Feb. 5–6 and Feb. 10–12. The clinic will be on the site of the Super Bowl Experience and officials said that fans who receive any …