Exhausted

“ClientEarth is now examining the latest [UK government air pollution] plan and could go back to court again if it decides the measures will not reduce illegal levels of air pollution in the ‘shortest possible time’, as the law demands.” https://www.theguardian.com/environment/2017/may/05/air-pollution-plan-sacrificing-the-nations-health-to-save-an-election-campaign

The UK government, in a flush of swollen electoral sovereignty, may feel justified in treating citizens as collateral damage as those with weak lungs are unlikely to be Conservative voters.

“The plan requires local authorities to exhaust all other options before introducing CAZ [clean air zones] charging for diesel vehicles, as will happen in London, such as removing speed bumps and retrofitting buses.”

It is hoped that the exhaust from these other options will obscure the diesel miasma.

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Noxious

“Levels of nitrogen dioxide, mainly from diesel engines, are ‘excessive’ in many British cities. … The Department for Environment, Food and Rural Affairs (Defra) said that Britain wasn’t alone in breaching the NO2 limits.” (http://www.bbc.co.uk/news/science-environment-26257703)

It would also like other technically illegal but common practice activities to be taken into account.