Which of the following is not a primary pollutant?

Smoke from a wild fire caused by lightening

Freon (a CFC) from an old refrigerator

Sulfur dioxide from iron are melting

Large amounts concrete dust from a construction site

read the sentence below and answer the question that follows. one of the norms in the village was to meet at the town square on fridays for a community dinner and dance. the underlined word in the sentence above is best defined as a a. cultural element shared by all people around the world b. specific area in a town used for traditional community events c. religious custom accepted and practiced by all members of a village d. behavioral pattern that is regularly accepted by a group of people