The EU air quality limits are not strict enough

The guidelines of the World Health Organisation (WHO) are 2.5 times stricter than the limit values in the EU legislation.

Over 90% of citizens in Europe are exposed to annual levels of outdoor fine particulate matter that are above WHO air quality guidelines. This accounted for 482,000 premature deaths in 2012 from heart and respiratory diseases, blood vessel conditions and strokes, and lung cancer.

More info on the WHO guidelines and the EU legislation:

http://www.who.int/phe/health_topics/outdoorair/outdoorair_aqg/en/
http://ec.europa.eu/environment/air/quality/index.htm

WHO