<span>A triumvirate is the name given to a government by three people. Perhaps the most famous triumvirate was that of Julius Caeser, Crassus and Pompey.</span>
Answer: Most likely the industrial revolution.
Explanation: The use of machines in production became more and more prevalent, eventually many factories were built in cities which caused pollution therefore making the air gross.
Where's the image? Once you post it, I'll be able to help!
