Subfield · Pollution
Top Countries in Pollution Research
China ranks first in 2022–2025, out of 60 ranked countries.
Composite score: field-normalised excellence, output and total citations weighted 50 / 30 / 20, each as a percentile so no single heavy-tailed measure dominates. Floor: 100 fractional works in this field.
Ranked by research quality, 2022–2025
| # | Country | Score | Top-10% rate | Works | Citations | All time |
|---|---|---|---|---|---|---|
| 1 | China | 100.0 | 23.8% | 24k | 380k | #2 |
| 2 | India | 83.1 | 17.7% | 6.8k | 74k | #4 |
| 3 | United States | 73.2 | 16.2% | 6.4k | 74k | #1 |
| 4 | United Kingdom | 66.1 | 20.3% | 2k | 30k | #3 |
| 5 | Australia | 60.7 | 26.6% | 1.2k | 22k | #7 |
| 6 | Türkiye | 56.2 | 16.3% | 1.7k | 16k | #12 |
| 7 | Italy | 52.5 | 21.0% | 1.9k | 27k | #11 |
| 8 | Germany | 49.2 | 18.3% | 1.8k | 25k | #5 |
| 9 | Pakistan | 46.3 | 21.4% | 1.1k | 14k | #13 |
| 10 | Canada | 43.8 | 17.4% | 1.5k | 20k | #6 |
| 11 | Saudi Arabia | 41.4 | 26.6% | 748 | 13k | #26 |
| 12 | Malaysia | 39.3 | 17.6% | 1k | 13k | #17 |
| 13 | Spain | 37.4 | 17.0% | 1.9k | 24k | #8 |
| 14 | Nigeria | 35.5 | 8.1% | 2k | 11k | #24 |
| 15 | South Korea | 33.9 | 17.7% | 1.5k | 21k | #15 |
| 16 | Iran | 32.3 | 17.0% | 1.4k | 17k | #20 |
| 17 | France | 30.8 | 12.9% | 1.7k | 16k | #9 |
| 18 | Bangladesh | 29.4 | 22.7% | 734 | 11k | #33 |
| 19 | Poland | 28.1 | 15.0% | 1.2k | 15k | #22 |
| 20 | Netherlands | 26.8 | 23.4% | 692 | 13k | #10 |
| 21 | Egypt | 25.6 | 18.1% | 871 | 11k | #35 |
| 22 | ?? | 24.5 | 18.8% | 807 | 11k | #32 |
| 23 | South Africa | 23.4 | 16.4% | 836 | 9.3k | #31 |
| 24 | Brazil | 22.4 | 7.6% | 2.7k | 18k | #21 |
| 25 | Japan | 21.4 | 11.6% | 1.4k | 13k | #14 |
| 26 | Portugal | 20.4 | 18.0% | 696 | 9k | #25 |
| 27 | Romania | 19.5 | 17.6% | 421 | 4.7k | #41 |
| 28 | Indonesia | 18.6 | 6.4% | 1.6k | 6.3k | #44 |
| 29 | Sweden | 17.8 | 20.2% | 449 | 6.5k | #18 |
| 30 | Taiwan | 16.9 | 17.3% | 438 | 5.9k | #30 |
| 31 | Hong Kong | 16.1 | 31.8% | 304 | 6.5k | #27 |
| 32 | Russia | 15.4 | 6.5% | 1.2k | 6.5k | #38 |
| 33 | Mexico | 14.6 | 10.4% | 779 | 7.2k | #37 |
| 34 | Denmark | 13.9 | 19.7% | 410 | 6.1k | #19 |
| 35 | Switzerland | 13.2 | 23.5% | 343 | 5.9k | #16 |
| 36 | Norway | 12.5 | 21.3% | 389 | 5.5k | #28 |
| 37 | Vietnam | 11.8 | 14.9% | 452 | 4.6k | #45 |
| 38 | Greece | 11.2 | 18.7% | 451 | 5.8k | #29 |
| 39 | Ghana | 10.5 | 17.2% | 366 | 3.5k | #47 |
| 40 | Iraq | 9.9 | 8.1% | 570 | 3.9k | #52 |
| 41 | Czechia | 9.3 | 15.8% | 451 | 4.8k | #39 |
| 42 | Belgium | 8.7 | 17.2% | 366 | 4.5k | #23 |
| 43 | Thailand | 8.1 | 13.3% | 549 | 5.9k | #46 |
| 44 | Austria | 7.6 | 21.4% | 259 | 3.8k | #34 |
| 45 | Ireland | 7.0 | 23.8% | 203 | 3.6k | #42 |
| 46 | Ethiopia | 6.5 | 19.0% | 320 | 3.2k | #54 |
| 47 | Morocco | 6.0 | 20.2% | 291 | 3k | #56 |
| 48 | United Arab Emirates | 5.5 | 22.7% | 214 | 3.2k | #55 |
| 49 | Finland | 4.9 | 21.7% | 245 | 3.5k | #40 |
| 50 | Hungary | 4.5 | 14.7% | 218 | 2.4k | #51 |
| 51 | Tunisia | 4.0 | 18.5% | 200 | 2.1k | #48 |
| 52 | Colombia | 3.5 | 10.4% | 332 | 3k | #59 |
| 53 | Chile | 3.0 | 13.4% | 246 | 2.9k | #49 |
| 54 | Serbia | 2.6 | 13.2% | 216 | 1.8k | #57 |
| 55 | Argentina | 2.1 | 9.0% | 348 | 3.1k | #53 |
| 56 | Kenya | 1.7 | 9.4% | 241 | 1.5k | #64 |
| 57 | Algeria | 125.3 | 9.0% | 230 | 1.3k | #61 |
| 58 | Ukraine | 82.8 | 7.4% | 227 | 979 | #66 |
| 59 | Philippines | 41.0 | 7.7% | 223 | 1.3k | #67 |
| 60 | Peru | 0.0 | 7.0% | 201 | 1.2k | #70 |
countries ranked worldwide in Pollution (60). rank on the composite score within the stated pool. The score track runs 0 to 100; the rate track carries no world mark, because the world rate differs by field.
How spread out this pool is
Every row above on one axis — one tick each, right is a higher score. A field where the top few are far clear of everyone and one that runs down evenly look identical as a table.
One bar per band of score, counting the rows on this page.