You may just be learning about sealcoating. You probably never thought there would be long term hazards just from maintaining your driveway or parking lot. Below, we have given you some links to take a look at. See what the research has to say. We provided you government and organization sources. Do you really want to chance using coal tar, if other non hazardous sources are available?
https://coaltarfreeusa.com/
https://www.usgs.gov/mission-areas/water-resources/science/coal-tar-based-pavement-sealcoat-pahs-and-environmental-health?qt-science_center_objects=0#qt-science_center_objects
https://www.cleanwisconsin.org/our-work/water/pah/
https://engrshwec.wiscweb.wisc.edu/wp-content/uploads/sites/711/2015/08/Sealants-health-and-envir-11-8-12.pdf
https://www.pca.state.mn.us/sites/default/files/tdr-g1-07.pdf
https://www.usatoday.com/story/money/business/2013/06/16/toxic-driveways-cities-states-ban-coal-tar-pavement-sealants/2028661/
https://law.wm.edu/academics/programs/jd/electives/clinics/vacoastal/documents/Needlleman%20White%20Paper_Web.pdf
https://www.scarce.org/keep-your-kids-safe-from-coal-tar/
https://www.wpr.org/asphalt-sealcoats-can-be-harmful-health-and-environment
https://ww2.kqed.org/quest/2014/01/23/could-your-driveway-be-poisoning-your-kids/