Consider the following diseases from which human beings are suffered.  I. Asthma    II. Dyspepsia        III. Bronchitis       IV. Emphysema Diseases due to SO2 are

Even low concentration of SO2 causes respiratory diseases as asthma, bronchitis, emphysema in human beings. Note: Irritation in eyes may also be due to  . Under high concentration of  , plants are affected and flowers fall off from plants. They are also decolorized  due to reduction.SO2+2H2O→H2SO4+2H. Nascent H  causes reduction and color fades.