They might be smoke testing the system, looking for leaks! Smoke is pumped into water pipe infrastructure and leaks out of potential cracks or undisclosed/illegal sources (such as a company dumping into the sewer system without disclosing it to the city). They do this so they can locate and fix these sources so the water remains uncontaminated by groundwater seepage.
The post in question: Dr. Tony Pastor, a cardiologist at Texas Children’s Hospital and assistant professor at Baylor College of Medicine, went on to post a TikTok on November 11 telling patients they’re not obligated to answer the question (Are you a US citizen?).
I learned in my scandinavian class in college that they dug up a nordic tavern ruin, and inside found a stick with carved runes on it. When translated, it said something to the effect of "HELGA SAYS COME HOME RIGHT NOW."
They might be smoke testing the system, looking for leaks! Smoke is pumped into water pipe infrastructure and leaks out of potential cracks or undisclosed/illegal sources (such as a company dumping into the sewer system without disclosing it to the city). They do this so they can locate and fix these sources so the water remains uncontaminated by groundwater seepage.