How loud is Kolkata?
Kolkata’s dense core runs an estimated 73–88 dB by day, driven by buses, taxis and reflexive honking on narrow colonial-era streets. West Bengal counters with India’s strictest firecracker noise cap and designated no-horn zones — enforcement, as everywhere in India, is the variable.
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| Rank (of 50 cities) | #6 |
|---|---|
| Estimated daytime range | 73–88 dB |
| Estimated night range | 60–75 dB |
| vs. WHO guidelines | ≈ 28 dB above the 53 dB Lden road-noise guideline (night guideline: 45 dB) |
| Dominant sources | road traffic, horns |
| Confidence | med |
Kolkata compresses a megacity’s traffic onto a street grid laid out long before it, and the acoustic consequence is a city centre where bus engines, Ambassador-era taxis and continuous horn use bounce between close building walls. Hospital corridors like the stretch past SSKM are nominal silence zones; drivers treat the signage as advisory.
West Bengal has one genuinely distinctive rule: the state capped firecracker noise at 90 dB(A) measured at five metres — stricter than the national limit — a regulation born from Kali Puja and Diwali nights and repeatedly defended in court against louder imports. The state pollution control board fields its heaviest complaint load those weeks.
Kolkata Police maintain no-horn zones and seasonal anti-noise drives, and the city’s long tram history offers a quieter template its bus fleet has never matched. Like Mumbai and Delhi, the national 55/45 dB residential limits apply on paper; the published monitoring shows the gap.
Kolkata noise: the specifics
- West Bengal caps firecracker noise at 90 dB(A) at 5 m — stricter than India’s national limit.
- Police-designated no-horn zones cover hospital and school stretches in the core.
- Festival weeks around Kali Puja and Diwali generate the state pollution board’s peak complaint volumes.
- Estimated 73–88 dB daytime range vs. the WHO’s 53 dB Lden guideline — roughly 28 dB over.
Ranges are estimates from our published-source corpus (UNEP Frontiers 2022, Mimi Worldwide Hearing Index, official noise maps and peer-reviewed studies) — see the methodology note on the City Sound Map. We publish ranges and confidence labels, not false point precision.
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