The icon of a strange "double s" in front of the car is not for emissions, it is for a general safety inspection (aka "Roadworthyness test"). The emissions inspection icon is the similar double s at the rear of the car (tailpipe).
Neither of these are BMW services, they are required by some local or state governments as periodic inspections. The time when each is due may be easily adjusted thru iDrive or your dash computer - see "Service Requirements" in your owner's manual. As my state does not require a periodic safety inspection, I've set mine to the year 2040 so the warning will not re-occur anytime soon.