The day starts out bright and sunny. later, a brown haze develops. this indicates the presence of Nitrogen dioxide.
Nitrogen dioxide is a chemical compound with the formula NO ₂. It is one of several nitrogen oxides. NO ₂ is an intermediate in the industrial synthesis of nitric acid, millions of tons of which are produced each year for use primarily in the production of fertilizers. At higher temperatures, it is a reddish-brown gas.
Elevated levels of nitrogen dioxide can cause damage to the human respiratory tract and increase a person's vulnerability to, and the severity of, respiratory infections and asthma. Long-term exposure to high levels of nitrogen dioxide can cause chronic lung disease.
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