Air pollution factors include sulfate or nitrate second particles derived from gas-to-particle transformation as well as original particles.

影响能见度的空气污染因子，不仅包括一次源，还应包括经由气-粒转化化学反应而产生的硫酸盐、硝酸盐等二次污染粒子。

youdao

External environmental causes of cancer are factors in the environment that increase risk of cancer such as air pollution, UV radiation and indoor radon.

外部环境致癌因素是指环境中导致罹患癌症的危险升高的因素，如空气污染、紫外线辐射及室内的氡等。

youdao

Air pollution is one of the number one factors that affect our quality of life and health.

空气污染是影响我们生活质量和身体健康的诸多因素之一。

youdao

The changes could not be explained by other factors - such as mother's age and socioeconomic status or population effects such as changes in air pollution and influenza epidemics.

BBC: Smoking ban 'cuts premature births'