Nitrogen dioxide inflames the lining of the lungs and it can reduce immunity to lung infections. This can cause problems such as wheezing, coughing, colds, flu and bronchitis.
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The correct option is A True Nitrogen dioxide is a obnoxious smelling gas. It is an air pollutant produced from burning of coal and oil. It also comes from vehicle exhaust. It forms smog, which has negative impact on human health. It mainly affects the respiratory system. It inflames the lining of the lungs. It makes lungs prone to infections. It causes problems like wheezing, coughing, flu, asthma, bronchitis.