Very fine distinctions between zones and the amounts of discharges authorized would provide more assured protection for ambient water or air quality, but also would complicate transfers and perhaps impair the marketability of permits.

• 由官方明确区分地界和排放的量，将会确保环境水和大气质量，但是也会使转让复杂化，或许会破坏许可证的可销售性。