airshedn.²

Brit.

/ˈɛːʃɛd/, U.S.

/ˈɛrˌʃɛd/

Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: air n.¹, shed n.¹

Etymology: < air n.¹ + shed n.¹, perhaps after German Luftscheide (although this is apparently first attested slightly later: 1926 or earlier), itself after Wasserscheide watershed n.¹

Geography.

A mountain ridge or other topographical feature which divides an airflow into distinct parts. Hence: a region in which the atmosphere behaves in a coherent way with respect to the dispersion of pollutants; the air supply of a given geographical or administrative region.

ΘΚΠ

the world > matter > gas > air > [noun] > air in any specific place or at specific time

desert-air1751

atmosphere1766

airshed1921

1921 Geografiska Annaler 3 193 He [sc. Dr Weickmann from Munich] had found that those [Mediterranean winter-cyclones] starting in the Adriatic and making for Asia Minor are split up into two against this highland (in the same way as it is known about the Atlantic cyclones, when striking the Norwegian ‘airshed’.—Reviewers rem.).

1955 Fresno (Calif.) Bee 4 Apr. a6/1 It [sc. the bill] would divide the state into three airsheds, each split into three basins, with county health officers responsible for local smog control.

1967 Economist 11 Feb. 521/1 HEW [sc. Health, Education and Welfare] would also be given power to pick out the ‘airsheds’ where regional control is needed and to establish regional commissions to set standards of air quality.

1996 Australia: State of Environm. (CSIRO) iii. 45/1 The airsheds of Sydney, Melbourne and Perth are near capacity for motor vehicle emissions.

2004 S. M. Wheeler Planning for Sustainability x. 137 Airsheds are typically created by mountain ranges or hills that trap air and create local pollution.

This is a new entry (OED Third Edition, June 2008; most recently modified version published online December 2021).

单词	airshed
释义	airshedn.² Brit. /ˈɛːʃɛd/, U.S. /ˈɛrˌʃɛd/ Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: air n.¹, shed n.¹ Etymology: < air n.¹ + shed n.¹, perhaps after German Luftscheide (although this is apparently first attested slightly later: 1926 or earlier), itself after Wasserscheide watershed n.¹ Geography. A mountain ridge or other topographical feature which divides an airflow into distinct parts. Hence: a region in which the atmosphere behaves in a coherent way with respect to the dispersion of pollutants; the air supply of a given geographical or administrative region. ΘΚΠ the world > matter > gas > air > [noun] > air in any specific place or at specific time desert-air1751 atmosphere1766 airshed1921 1921 Geografiska Annaler 3 193 He [sc. Dr Weickmann from Munich] had found that those [Mediterranean winter-cyclones] starting in the Adriatic and making for Asia Minor are split up into two against this highland (in the same way as it is known about the Atlantic cyclones, when striking the Norwegian ‘airshed’.—Reviewers rem.). 1955 Fresno (Calif.) Bee 4 Apr. a6/1 It [sc. the bill] would divide the state into three airsheds, each split into three basins, with county health officers responsible for local smog control. 1967 Economist 11 Feb. 521/1 HEW [sc. Health, Education and Welfare] would also be given power to pick out the ‘airsheds’ where regional control is needed and to establish regional commissions to set standards of air quality. 1996 Australia: State of Environm. (CSIRO) iii. 45/1 The airsheds of Sydney, Melbourne and Perth are near capacity for motor vehicle emissions. 2004 S. M. Wheeler Planning for Sustainability x. 137 Airsheds are typically created by mountain ranges or hills that trap air and create local pollution. This is a new entry (OED Third Edition, June 2008; most recently modified version published online December 2021). < n.²1921
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airshedn.2

airshedn.²