How loud is Delhi?

Delhi treats the horn as a continuous signal rather than a warning: at major junctions like ITO or Ashram Chowk, honking forms a near-constant carrier wave over engine noise from one of the world’s largest vehicle fleets. The Central Pollution Control Board operates a real-time National Ambient Noise Monitoring Network in Delhi, and its stations routinely log violations of the legal limits.

Those limits are specific: India’s Noise Pollution (Regulation and Control) Rules 2000 cap residential areas at 55 dB by day, 45 dB at night, and define silence zones within 100 metres of hospitals, schools and courts where honking is an offence. Enforcement spikes around Diwali, when regulators also cap firecracker loudness (125 dB(AI) measured at four metres) — and the city still lights up well past it.

Delhi’s traffic police run periodic “no honking” drives with fines, and the National Green Tribunal has repeatedly ordered stronger noise enforcement. The structural fixes — segregated corridors, electric buses, construction barriers — are arriving more slowly than the decibels.

Delhi noise: the specifics

• CPCB’s real-time monitoring network logs routine violations of the 55 dB day / 45 dB night residential limits.
• Silence zones within 100 m of hospitals, schools and courts make honking a fineable offence (Noise Rules 2000).
• Firecrackers are legally capped at 125 dB(AI) at 4 m — a Diwali-driven rule unique to India’s noise regime.
• Estimated 75–90 dB daytime range vs. the WHO’s 53 dB L_den guideline — roughly 30 dB over.