Every driver, even of an electric car, is obliged to purchase such a sticker for approximately 5 euros. And only those who drive a car that meets the standards can purchase such a sticker. This is done via the government website, and you must upload a photo of your registration certificate. So anyone driving to Auchan, or even just crossing the border in Halluin, must purchase such a sticker. The fines can range from 68 to 450 euros.
You can easily change your sticker online order.