See: air quality initiatives 
at PlaNYC
Law: NYC Administrative Code (Search for Title 24, Chapter 1, Subchapter 7, Section 24-163: Operation of Motor Vehicles; Idling of engine restricted)
Rules: Rules of the City of New York (Search for Title 34, Chapter 4, Section 4-08(p): Engine Idling)
Summary: Since the early 1970's, NYC law restricts the idling of motor vehicle engines while parking, standing or stopping as part of the City policy to reduce air pollution. No motorized vehicle can idle for longer than 3 minutes unless it is being used to operate equipment.
In accordance with NYC's anti-idling law, construction rules prohibit idling at construction sites as part of noise mitigation, and trade waste rules prohibit idling as part of waste collection operations in accordance with this law. The Mayor's PlaNYC sustainability plan includes an initiative to reduce idling from taxis and for-hire vehicles.
Amendments: Local Law 25 of 2004 establishes penalties for non-compliance, and requires signage related to prohibited idling, Local Law 4 of 2009 broadens the enforcement of unauthorized engine idling to multiple city agencies, and Local Law 5 of 2009 further restricts engine idling near schools.
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