This article would be more helpful with some historical context. At some point in the past, if all cars were equal, 90% of cars produced 90% of the pollution. Over time newer cars replaced most of the old ones, and now it's 25% of cars. But the overall amount of pollution has dropped too. A future clickbait headline will read "5% of cars cause 90% of the pollution!" and sound very alarming, but in fact that's a measure of progress in removing most of the remaining polluters.
If 5% of cars really caused 90% of the pollution in the future, then we should certainly banish those cars, shouldn't we? It would be a very informative title.
Only if those were new cars. If electric cars become the norm, then one day 100% of car pollution will be produced by <<1% of cars, but the total will be so low that it won't be worth worrying about those antique internal combustion cars. Percentages can be misleading.
