The air in many places in Europe has been disgusting lately. In Paris, two weeks ago, there was record particle pollution: visible haze and you coughed every minute when running even extremely slowly. In addition to the usual pollution sources, now is the period when they pour massive amounts of stuff over the fields. Stuff that releases small particles in the air when the weather is warm like now.
Here's London now: http://www.airqualitynow.eu/comparing_city_details.php?london
That was the north of France and south of England on 21 March: http://airparif.fr/actualite/detail/id/136
Explanations about the health issues: http://www.airqualitynow.eu/pollution_health_effects.php
Unfortunately, we do have a problem.