When we drink or use water it is a conscious decision. When we see a lake or stream, we notice it. But we are constantly looking through air and we are always immersed in it.
Air is a substance that has weight and moves and behaves like a fluid.
The DNR monitors and maintains air quality within Iowa under the Clean Air Act. The Air Quality Bureau does planning, rulemaking, issues construction and operating permits, monitors air quality and emissions. Technical assistance, compliance and enforcement activities are all a part of efforts to help maintain our air quality. Unlike water, we consume air automatically, continuously and without choice as to when or where. Adults breathe about 20,000 times daily, with an average volume intake of 15,000 liters.