It's not like it's a controversial topic. It's a well known, well studied, and well documented effect. https://academic.oup.com/pnasnexus/article/2/1/pgac285/6

It's not like it's a controversial topic. It's a well known, well studied, and well documented effect. https://academic.oup.com/pnasnexus/article/2/1/pgac285/6979725 https://academic.oup.com/pnasnexus/article/2/1/pgac285/69797... https://www.sciencedirect.com/science/article/abs/pii/S0045653516313285 https://www.sciencedirect.com/science/article/abs/pii/S00456... https://www.emerald.com/insight/content/doi/10.1108/AEAT-05-2020-0108/full/html https://www.emerald.com/insight/content/doi/10.1108/AEAT-05-... https://chemrxiv.org/engage/chemrxiv/article-details/60c74f2e0f50dbe15d397360 https://chemrxiv.org/engage/chemrxiv/article-details/60c74f2... https://www.sciencedirect.com/science/article/abs/pii/S1352231011007333 https://www.sciencedirect.com/science/article/abs/pii/S13522... Avgas is unnecessarily putting more lead into the air. Any amount of lead in the air is bad.