With the stone castle, a large isolation space could be created, and the external air, once filtered and replaced inside, would avoid the huge problems caused by air pollution.
Yu Hong estimated that the main reason he hadn't been coughing was probably because he had been staying in the cave for a long time, and his physical condition was far superior to others.
Time was of the essence; to solve the air monitoring problem, he needed to find some air detection devices first.
They certainly weren't available in the camp.
Just as well, he also planned to go out and test the specific radiation lethality of Inner Qi and see if the camp's array would fail again like the luminous grass once he left.
Not wasting any more time, Yu Hong returned to the cave, put on his gear and weapons, and left the camp immediately without notifying Old Zhou and the others. He sped ahead, rushing toward the nearest town.
