Scientists say carbon dioxide emissions factor in as one reason why, but that most of the blame this time is on El Nino.

科学家们表示二氧化碳排放是其中一个原因, 但罪魁祸首则是厄尔尼诺现象。

The results of our studies, we basically come up with what we call emission factors and those are numbers that can be used by air quality agencies to estimate pollution.

根据我们的研究结果，我们基本得出了我们所说的排放因子，这些数字可以被空气质量机构用来估计污染。