Big chimneis

Big chimneies come out from the roof of plastic clothing factory. We have to climb on its roof with straight steel ladder. The most part of roof is made of precast slab, which means it is bit shaking when walking on it. But we have to reach that chimneies so that we can collect gas samples whthin them. It is windy and shinning on top of roof. However, I can't believe I can make it before I made it.