I somehow missed that you were going to Spain by skimming that bit! Well if you believe the press we get our health and safety legislation from the EU, which Spain is part of...
Your brain has lodged the fact "asbestos is harmful" and created a phobia. Throwing facts at you about the actual levels of asbestos that are harmful will do nothing here. Reminding you that no-one you've ever known has ever had a problem with asbestosis even thought it was a very common building material won't help. Reminding you contractors in a public building in a developed country wouldn't be throwing material around if it was harmful to customers to do so won't help. Reminding you thousands of people will be passing through that building, and buildings undertaking the same work across the world, without a single one having problems won't help.
Your fear of asbestos is arbitrary. It may as well be carbon monoxide, or flouride, or snakes, or spiders, or clowns. It's impacting your life, and the life of your family, and you need to get help.