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

Rectangle qrst is shown. angle qrt is congruent to angle str, and angle str is complementary to angle qtr. which statement is true about angles qrt and qtr? they are congruent. they are complementary. they are supplementary. they are right angle