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Table 3 Top 10 active countries in publishing documents in air pollution – related respiratory health (1900 – 2017)

From: Outdoor air pollution and respiratory health: a bibliometric analysis of publications in peer-reviewed journals (1900 – 2017)

Country Frequency (%) GDP per capita Productivity per GDP/capita/year Intra-country collaboration Inter – country collaborationa
N = 3635 (a 103) USD per year
United States 1082 (29.8) 57.467 18.8 806 (74.5) 276 (25.5)
United Kingdom 279 (7.7) 39.899 7.0 152 (54.5) 127 (45.5)
Italy 198 (5.4) 30.527 6.5 131 (66.2) 67 (33.8)
France 196 (5.4) 36.855 5.3 130 (66.3) 66 (33.7)
China 180 (5.0) 8.123 22.2 90 (50.0) 90 (50.0)
Canada 169 (4.6) 42.158 4.0 93 (55.0) 76 (45.0)
Germany 169 (4.6) 41.936 4.0 101 (59.8) 68 (40.2)
Netherlands 121 (3.3) 45.295 2.7 55 (45.5) 66 (54.5)
Sweden 119 (3.3) 51.600 2.3 50 (42.0) 69 (58.0)
Japan 117 (3.2) 38.895 3.0 91 (77.8) 26 (22.2)
  1. aInter – country collaboration = international collaboration