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. 2022 Mar 19;29(36):54769–54781. doi: 10.1007/s11356-022-19534-y

Table 2.

The 15 most productive countries in relation to the total number of publications and citations

Most productive countries Number of citations per country
Position Country Records % Position Country Total citations Average citation
1 China 1472 32.96 1 China 41,778 28.38
2 Spain 436 9.76 2 Spain 29,381 67.39
3 Brazil 345 7.72 3 Italy 18,466 97.70
4 India 291 6.52 4 France 14,840 61.83
5 USA 258 5.78 5 Brazil 12,374 35.87
6 France 240 5.37 6 India 9577 32.91
7 Iran 220 4.93 7 USA 8680 33.64
8 Italy 189 4.23 8 Iran 5404 24.56
9 Mexico 157 3.52 9 Turkey 5225 37.59
10 Turkey 139 3.11 10 Switzerland 5126 142.39
11 South Korea 130 2.91 11 Mexico 4939 31.46
12 Tunisia 113 2.53 12 S. Korea 4559 35.07
13 Taiwan 112 2.51 13 Tunisia 3883 34.36
14 Japan 103 2.31 14 Japan 3396 32.97
15 Canada 90 2.02 15 Portugal 3253 45.82