1.2 Presentation Lee el párrafo y observa cuidadosamente la figura a continuación que muestra los contaminantes primarios y secundarios en el medio ambiente. There are two categories of outdoor air pollutants: Primary pollutants and Secondary pollutants. Primary pollutants are chemicals that have been added directly to the air by natural events or human activities and occurs in a harmful concentration. Several examples of Primary pollutants include soot and carbon monoxi- de, both which are emitted by smoke in factories. Secondary pollutants are harmful chemicals formed in the atmosphere when a primary pollutant reacts with normal air components or other air pollutants. Examples of Secondary pollutants would be Peroxyacyl Nitrates (PANS), Sulfur Trioxide (SO3), and Ozone (03). All of these have a negative effect on the environment.
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es de inglés o que por qué es algo confuso y no se entiende en si que hay que hacer si es una actividad de inglés
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