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Every week, in addition to the top 10 you'll keep track of:
- Top climbers
- Top newcomers

This Top 500 is now available to Sponsor.

Global ranking of Top 500 influencers and players active on Twitter in Clean Air - tackling issues from pollution and urban smog, to indoor air quality and sick building syndrome. Players range from government bodies and campaigning organisations, to market-leading engineers and specialist suppliers; from those concerned with policy and best practice, business strategies and design solutions; to innovators in technology and materials, plus experts in emissions monitoring, measuring and metrics. Weekly update day: Tuesday.

The Leaderboard ranks Players on the basis of scores that measure interactions and influence across social media, with the metrics provided predominantly via leading independent platform Kred, plus an additional custom element.

Curated and Managed by Jim McClelland @SustMeme, the data is published by McClelland Media Ltd.

The full menu of sectors and topics for which SustMeme Top 500 rankings are published, including impending launches, can be viewed here.

To nominate a person or organisation for potential inclusion on this ranking, please simply Tweet the Twitter Username of the nominee to @SustMemeTop500, using the hashtag #Top500ADDCleanAir.

For all news of Top 500 releases, updates and peer group notifications, please Follow dedicated Twitter feed: @SustMemeTop500.