One of the primary ways air pollutants are removed from the atmosphere is through rain. When you have significant levels of pollutants in air they will be collected by falling water droplets and rain out of the atmosphere. That's why we are getting these reports of black rain falling from the sky after the oil depots were struck—evidence of just how contaminated the local air must be.
Warwick, N., Griffiths, P., Keeble, J., Archibald, A., & Pyle, J. Atmospheric implications of increased Hydrogen use. GOV.UK https://www.gov.uk/government/publications/atmospheric-implications-of-increased-hydrogen-use (2022).
