Delhi's 24-hour air quality index measures the concentration of harmful pollutants.

德里的24小时空气质量指数衡量有害污染物的浓度。

However, they present a significant threat to the environment as they emit harmful pollutants and contribute to climate change.

然而, 它們對環境構成重大威脅, 因為它們排放有害污染物並導致氣候變化。

Plastic can take up to 1000 years to break down and it also has the potential to leak harmful pollutants into the soil.

塑料可能需要长达 1000 年的时间才能分解，而且还有可能将有害污染物泄漏到土壤中。