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Dan Brekke @danbrekke.bsky.social · 05/07/2026

Purple Air particulate readings (PM 2.5) as our annual fireworks extravaganza winds down ... #berkeley #okaland #alameda

Color map showing air quality readings during illegal fireworks on the evening of the Fourth of July.

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Dan Brekke @danbrekke.bsky.social · 05/07/2026

And a Purple Air overview of the L.A. area. This spike in particulates is a regular feature of the massive illegal fireworks displays across California.

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