Pollutant

We can conclude that this phenomenon is not related to either pollutant.

Lead is a common environmental pollutant.

The dead zone’s expansion is believed to be driven by pollutant runoff from farms and cities contaminating the Mississippi River, which flows into the Gulf of Mexico and stimulates oxygen-consuming algae growth.

The agency says a space observation satellite detected significantly lower levels of the air pollutant nitrogen dioxide (NO₂) in northern Italy and China’s Hubei province.

Acid rain forms when water in the atmosphere condenses on particles containing acid-forming pollutants, such as sulfate produced by the burning of fossil fuels and nitrogen oxides from automobile exhausts.