JAMB Chemistry 2021 Paper

Concept:Tropospheric pollution is caused by the presence of unwanted gases and solid particles in the lowest atmospheric layer.Explanation:The troposphere is the lowest layer of the Earth's atmosphere.It is the layer where weather occurs and where living organisms breathe and exist.Air and gases mix freely within this layer.Tropospheric pollution happens when harmful substances are introduced into this air.These unwanted substances exist in two main forms.The first form is gaseous pollutants, such as carbon monoxide ($\mathrm{CO}$), sulphur dioxide ($\mathrm{SO}_2$), and nitrogen oxides ($\mathrm{NO}_x$).The second form is particulate pollutants, including dust, smoke, soot, and fine solid aerosols suspended in the air.Since pollution in the troposphere comes from both gases and solid particles, these are the two distinct types of pollutants found there.Answer:A. Gaseous and particulate pollutants.