Quantico is conducting a controlled burn and the smoke is coming all the way up to Burke/Fairfax. Evidently, they do this annually. Found a 2019 article but nothing for this year.
https://www.insidenova.com/news/prince_william/local/quantico/quantico-conducting-large-controlled-burn-today/article_a17392e2-56d9-11e9-bb5f-078baaf5e2ac.html