Ocean-going ships are a major unregulated air pollution source.
Hunters' lead shot and anglers' lead sinkers are still a pollution source, despite rules restricting them.
EPA reviews its health-based standard for NO2 as an air pollutant, and has issued a science assessment of health effects.
Links
[1] https://www.sej.org/publications/watchdog-tipsheet/new-gao-report-suggests-epa-doesnt-have-a-clue-cafo-toxics
[2] https://www.sej.org/category/sej-publication/watchdog-tipsheet
[3] https://www.sej.org/category/topics-beat/air
[4] https://www.sej.org/category/topics-beat/pollution
[5] https://www.sej.org/category/region/national
[6] https://www.sej.org/taxonomy/term/81
[7] https://www.sej.org/publications/tipsheet/6-year-study-western-parks-contamination-due-soon
[8] https://www.sej.org/category/sej-publication/tipsheet
[9] https://www.sej.org/category/region/national/mountain-west
[10] https://www.sej.org/category/region/national/southwest
[11] https://www.sej.org/publications/tipsheet/studies-zoom-mississippi-river-basin-and-gulf-polluters
[12] https://www.sej.org/category/topics-beat/water
[13] https://www.sej.org/category/region/national/southeast
[14] https://www.sej.org/publications/tipsheet/ozone-forecasts-can-help-reduce-health-problems
[15] https://www.sej.org/category/region/national/northwest
[16] https://www.sej.org/publications/tipsheet/blue-skies-and-greenhouse-gases-is-air-travel-really-a-big-deal
[17] https://www.sej.org/category/topics-beat/climate-change
[18] https://www.sej.org/category/topics-beat/energy
[19] https://www.sej.org/publications/tipsheet/major-banks-toughen-rules-for-financing-coal-power-plants
[20] https://www.sej.org/category/topics-beat/business
[21] https://www.sej.org/publications/tipsheet/pressure-mounts-fix-old-uranium-sites
[22] https://www.sej.org/category/topics-beat/nuclear-power/radiation
[23] https://www.sej.org/publications/tipsheet/air-pollution-from-ships-new-laws-new-science-0
[24] https://www.sej.org/category/topics-beat/transportation
[25] https://www.sej.org/category/region/international
[26] https://www.sej.org/publications/tipsheet/report-lead-from-hunting-and-fishing-still-pollutes
[27] https://www.sej.org/category/topics-beat/chemicals/toxics
[28] https://www.sej.org/category/topics-beat/land
[29] https://www.sej.org/publications/tipsheet/new-science-clarifies-no2-health-effects-0
[30] https://www.sej.org/category/topics-beat/health
[31] https://www.sej.org/publications/list/%2A/120
[32] https://www.sej.org/publications/list/%2A/120?page=49
[33] https://www.sej.org/publications/list/%2A/120?page=42
[34] https://www.sej.org/publications/list/%2A/120?page=43
[35] https://www.sej.org/publications/list/%2A/120?page=44
[36] https://www.sej.org/publications/list/%2A/120?page=45
[37] https://www.sej.org/publications/list/%2A/120?page=46
[38] https://www.sej.org/publications/list/%2A/120?page=47
[39] https://www.sej.org/publications/list/%2A/120?page=48
[40] https://www.sej.org/publications/list/Watchdog+TipSheet