Pervasive light pollution—from streetlights, billboards, and indoor lighting—is driving a dramatic decline in India’s firefly populations. These nocturnal insects rely on darkness for mating signals, and artificial light disrupts their natural glow, leading to failed reproduction, population collapse, and broader biodiversity loss. As indicators of healthy, pesticide-free ecosystems, fireflies’ decline signals an urgent need for dark sky policies and biodiverse urban planning.
Key Highlights
Firefly mating disruption: Artificial light reduces signal-to-noise ratio of bioluminescent flashes, leading to 80% mating failure in illuminated habitats.
Population decline: Regional surveys report 50–75% reduction in firefly abundance over the past decade in urban fringe and agricultural landscapes.
Ecosystem indicators: Fireflies thrive only in pesticide-free, moist environments; their loss reflects chemical pollution and habitat degradation.
Policy gap: India lacks comprehensive dark sky legislation; up to 30% of urban night sky luminance is unnecessary glare.
Design solutions: Shielded fixtures, warm‐color lighting, and timed dimming can restore nocturnal habitats while maintaining public safety.