Related by context. Frequent words. (Click for all words.) 47 Diesel exhaust 46 Barbara Gann 45 Passive smoking 45 ultrafine particles 45 pollutants emitted 44 Schipol 44 Kotil 44 Rob Yingling 44 Carolyn Fennell 43 volcanic ash clouds 43 airports 43 secondhand cigarette 42 Serirat 42 airplanes 42 Heathrow Gatwick Stansted 42 Roissy Charles de Gaulle 41 Iceland Eyjafjallajökull volcano 41 International Sunport 41 planes 41 operator Fraport 41 nitrogen dioxide 41 transatlantic airliners 41 Dave Messing 41 Knapinski 41 Abu Dhabi Etihad Airways 40 spokesman Jeff Kovick 40 air pollution 40 Sheremetyevo airport 40 passive smoking 40 asthma bronchitis 40 Caroline Boren 40 aviation 40 aggravate asthma 40 occupational exposures 40 budget airline easyJet 40 spokesman Todd Lehmacher 40 Nitrogen oxides 40 Glasgow Prestwick 40 journal Epidemiology 40 secondhand tobacco 40 airborne pollutants 40 backscatter machines 40 circulatory diseases 40 Volcanic ash cloud 40 Woolcock Institute 39 fine particulates 39 Cologne Bonn airport 39 runways taxiways 39 Nancy Castles 39 airports operator BAA 39 transatlantic flights 39 vector borne 39 BAA Stansted 39 Heathrow Stansted 39 Ian Olver 39 Andrew Herdman 39 cost airline easyJet 39 asthma chronic bronchitis 39 Particulate matter 39 #,# butadiene 39 trigger allergic reactions 39 lung function 39 shorthaul 38 BAA Heathrow 38 Orlandella 38 Amsterdam Schiphol airport 38 Mid Continent Airport 38 airborne contaminants 38 Deborah Arnott 38 Jeff Fegan 38 particulate matter 38 dietary sodium 38 intercontinental routes 38 refuellers 38 Particle pollution 38 Andrea McCauley 38 Iceland Eyjafjoell volcano 38 PET positron emission tomography 38 Smith Bindman 38 backscatter X ray 38 Janice Nolen 38 cardio vascular disease 37 aircraft 37 Stephen Forshaw 37 DAL.N 37 Q# turboprop 37 X ray scans 37 HIAL 37 Li Jiaxiang 37 Schiphol Airport 37 airborne particles 37 PM#.# 37 Manx2.com 37 jetliners 37 airliners 37 spokeswoman Whitney Eichinger 37 diesel fumes 37 airborne pathogens 37 fine particulate pollution 37 Dick Knapinski 37 EmiratesEmirates