Propublica has some excellent research published lately (it's an entire series of articles based on one primary analysis): https://www.propublica.org/article/to

Propublica has some excellent research published lately (it's an entire series of articles based on one primary analysis): https://www.propublica.org/article/toxmap-poison-in-the-air https://www.propublica.org/article/toxmap-poison-in-the-air It's based on somewhat-voluntarily reported data, rather than measured air samples. Mainly because we don't have effective air monitoring stations in anywhere near enough density to any kind of useful data science.