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.

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