The new ultra-low emission zone (Ulez) is likely to be a big issue in next year's mayoral election.

“超低排放新区（Ulez）”很可能是明年伦敦市长选举的重大议题。

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The mayoral election is held annually.

选举已经定在十月举行。

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In addition to the two governor's races, there will be special elections for U.S.House seats in New York and California, and mayoral elections in several major U.S.cities including New York,Boston, Houston,Detroit,Pittsburgh, Seattle and Minneapolis.

VOA: standard.2009.10.23

In September 1981, Koch made history by winning both the Democratic and Republican mayoral nominations.

BBC: Obituary: Ed Koch

His involvement in the controversial selection process for Labour's mayoral candidate was particularly criticised.

BBC: Clive Soley

Only 21 percent of registered voters participated in the recent Los Angeles mayoral primary, for example.

FORBES: Boston: Turns Out Civic Responsibility Isn't (Completely) Dead After All