smokeless zone

noun

noun

An area designated by a local authority where only smokeless fuels are permitted.

In addition, the change-over at Bow from steam to diesel locomotives will help to minimise the local smoke nuisance and conform with Government schemes for the establishment of smokeless zones.1957 November 23, “Notes and News: Locomotive Notes: First B.R. All-Diesel Depot”, in Railway Magazine, page 812:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.