From the Star article:
Displays giving up-to-the-minute information on pollution will be installed in the store, encouraging shoppers to delay their journeys home when air quality is poor.
Right, so you've had your meatballs and chips, filled up your car with furniture, got the kids in the back and then you look at the air quality indicator and say, "Ooh, the air quality's really poor, we can't go home in that, we'd better hang around aimlessly for another couple of hours instead."
A very likely scenario.