Yes Fukuda 2023 surely reminded us that NOx can never be excluded in so far this reminder was still needed.
A new root cause? NOx - New Scientific Knowledge & Development - Nitrosamines Exchange (usp.org)
Recently I also liked this paper:
Applied Sciences | Free Full-Text | Assessment of NOx Levels in an Underground Hospital Car Park: Implications for Occupational and Environmental Health (mdpi.com)
It is about NOx in underground parking lots, but also nicely demonstrating the use of a mobile detector (like Multigas detector Dräger X-am 5600) to check NOx in different places for risk assessment scenarios substantiation as an alternative to fixed technology for online air sampling and testing.