Air Plumes
Three cities as smoke emitters, where today's real PM2.5 sets how thick each plume is. Delhi usually smokes hardest. The hour of day advances so you can watch the daily pollution cycle.
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Chapter 4 (Particle Systems). Each city is an emitter; the live PM2.5 reading sets its spawn rate and particle color, so the particle system becomes a live air-quality comparison.
Data: Open-Meteo Air Quality API, hourly PM2.5 for Berlin, Delhi, Los Angeles (public, no key).