Good job on the fireworks team
Most of the Denver Metro area saw PM2.5 air quality spike to Unhealthy levels Saturday night as fireworks, both city-run and illegal private shows, lit up the skies. Firework smoke generally cleared out within a couple hours, returning to pre-firework levels by ~2AM in most cases.
Once again, on the upwind side of the Metro area and without any city fireworks, Boulder actually saw a PM2.5 minimum occur during the time when most other cities were breathing in the high levels of metal-rich smoke from fireworks.
This is something we discussed last year: https://bouldercast.com/cleaner-air-is-just-another-reason-that-official-city-fireworks-will-never-return-to-boulder/
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EDIT: Data /graph source: Purple Air cf3.4 conversion: https://map.purpleair.com/air-quality-standards-us-epa-aqi?q=purpleair.com&opt=%2F1%2Fm%2Fi%2Flp%2Fa10%2Fp604800%2FcALT%7C3.4&select=98051#10.11/40.0851/-105.1204 .If you want to make similar timelines, click some dots in your city/neighborhood and a graph will appear in the top left. Zoom to the timeline you want. Export to PNG.