Under GB/T 22485-2021, what is the statutory standard for taxi in-cabin cleanliness, odor control, and seat cover maintenance?

1. The cabin must be odorless, clean, and well-ventilated, with seat covers kept clean, flat, free of stains or tears, and changed regularly according to hygiene regulations
2. Seat covers only need to be replaced once every two years during annual vehicle inspection
3. Accumulated trash and cigarette butts under floor mats are acceptable if not visible from outside
4. Strong artificial incense should be sprayed heavily to mask vehicle mechanical smells