Several studies point to IAQ as a significant health problem. This dilemma is the proliferation of ultrafine particles (UFP), defined as particles with a diameter less than 100 nm, capable of penetrating the bloodstream and eliciting adverse health outcomes. Given the apparent absence of universal regulatory standards for UFP control worldwide, this comprehensive study endeavors to elucidate the diverse methodologies and strategies employed internationally for the monitoring and mitigation of UFP. As a first step, an exhaustive review was carried out with the aim of establishing the contemporary panorama of UFP research. To find out about global practices in evaluation by UFP researchers, a survey was carried out using a meticulously designed questionnaire. These responses provided valuable insights into the international community of UFP practitioners, encompassing their preferred measurement methodologies and the utilization of guideline values, where applicable, thereby offering a holistic portrayal of global trends in UFP control and investigation. A predominant finding was the absence of specific methodologies for UFP measurement, coupled with the lack of national standards addressing this critical issue. These findings underscore the urgent need for regulatory interventions aimed at standardizing assessment protocols and establishing guideline values to safeguard human health.