A tier 4

In the country, there were several cities that if one were to look from the outside, were nearly impossible to see. This was due to the thick smog that covered most of them; these were the cities known as Tier 4.

The thing was, with places that were regarded as Tier 4, all of them were cities. Tier 3 places could be a mixture of towns and cities, but all of the places classified as Tier 4 were large cities.

The simple reason for this was because they were the country's factories. Although there were factories in the Tier 3 cities, they weren't enough to pump out large amounts of smog in their cities.

Most of them, as well, weren't those types of factories that would produce so much pollution in the first place.

However, all of the Tier 4 cities were essentially factories. They made parts for the bigger corporations' businesses, the Tier 2 and the Tier 1s. Most of it was hard gruelling labour, and they were paid next to nothing.