Do Data Centers Cause Air Pollution? It Depends on Power.

Data centers emit little local air pollution during normal operations, but their overall air-quality impact depends heavily on where their electricity comes from. When data centers draw power from fossil-fuel plants or use on-site diesel or gas generators, they contribute to air pollutants like nitrogen oxides and fine particulate matter in surrounding communities. The pollution level varies based on several factors: whether facilities use renewable energy sources, whether they rely on grid power versus on-site generation, how frequently backup generators run, and what fuel type powers any on-site equipment. Understanding a data center's air pollution contribution requires examining its specific power sourcing decisions and generation practices rather than treating all facilities the same.