The United States emitted 19.5 million t of nitrogen oxides

Question

(NO) into the atmosphere in 1987. One metric ton (1 t) equals 1,000 kg. How many
kilograms of NO were emitted to the atmosphere in the United States during 1987?

Assuming the 19.5 tons were metric tons then take
19,500,000 times 1000 to get your answer. Just add 3 zeros anf set the commas.

19,500,000,000