
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/tipsheet/major-banks-toughen-rules-for-financing-coal-power-plants
[2] https://www.sej.org/category/sej-publication/tipsheet
[3] https://www.sej.org/category/topics-beat/climate-change
[4] https://www.sej.org/category/topics-beat/business
[5] https://www.sej.org/category/topics-beat/energy
[6] https://www.sej.org/category/topics-beat/pollution
[7] https://www.sej.org/category/region/national
[8] https://www.sej.org/taxonomy/term/81
[9] https://www.sej.org/publications/tipsheet/pressure-mounts-fix-old-uranium-sites
[10] https://www.sej.org/category/topics-beat/nuclear-power/radiation
[11] https://www.sej.org/publications/tipsheet/air-pollution-from-ships-new-laws-new-science-0
[12] https://www.sej.org/category/topics-beat/air
[13] https://www.sej.org/category/topics-beat/transportation
[14] https://www.sej.org/category/region/international
[15] https://www.sej.org/publications/tipsheet/report-lead-from-hunting-and-fishing-still-pollutes
[16] https://www.sej.org/category/topics-beat/chemicals/toxics
[17] https://www.sej.org/category/topics-beat/land
[18] https://www.sej.org/publications/tipsheet/new-science-clarifies-no2-health-effects-0
[19] https://www.sej.org/category/topics-beat/health
[20] https://www.sej.org/taxonomy/term/120/all/target%3D%27_blank%27
[21] https://www.sej.org/taxonomy/term/120/all/target%3D%27_blank%27?page=778
[22] https://www.sej.org/taxonomy/term/120/all/target%3D%27_blank%27?page=771
[23] https://www.sej.org/taxonomy/term/120/all/target%3D%27_blank%27?page=772
[24] https://www.sej.org/taxonomy/term/120/all/target%3D%27_blank%27?page=773
[25] https://www.sej.org/taxonomy/term/120/all/target%3D%27_blank%27?page=774
[26] https://www.sej.org/taxonomy/term/120/all/target%3D%27_blank%27?page=775
[27] https://www.sej.org/taxonomy/term/120/all/target%3D%27_blank%27?page=776
[28] https://www.sej.org/taxonomy/term/120/all/target%3D%27_blank%27?page=777