Electric horns cause sound pollution. they should be banned. (join into relative clause)
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The Central Pollution Control Board (CPCB) has banned pressure, multi-toned and musical vehicle horns. In a notification to state pollution boards and the police in Mumbai, Delhi, Chennai, Kolkata, Hyderabad, Bangalore, Lucknow, Navi Mumbai and Thane, the CPCB said that drivers should not be allowed to honk needlessly, continuously or more than necessary, especially in silence zonesVehicles shall not be fitted with power, pressure or musical horns giving a sharp, shrill and alarming noise. Vehicles found with such horns shall be challenged by the enforcement authority [police] and the horn shall be confiscated,” said the notification by SP Singh Parihar, chairman, CPCB.
Traffic junctions in India have no rules on permissible sound levels for honking or vehicular noise. Horns in Mumbai emanate noise as high as 110 decibels (dB) – equal to the noise levels at a rock concert.
This is significantly above the safe limit suggested by the World Health Organization (WHO), which cautions that long-term exposure to noise levels from 85db to 90db can lead to hearing loss.