Air Pollution
Acadia National Park is downwind from a very industrial and urban area. Because of this, high concentrations of air pollutants blow into the park from these places. The effects of air pollution are hazards to wildlife, acid rain, and also haze. The pollution that causes a hazy sky can come directly from industrial facilities. Since Acadia National Park is downwind from these facilities, it is hit hard by haze.
Non-Native Species
About one-third of Acadia National Park's flora is made up of non-native species, some of which are very invasive and dangerous. The effects of these invasive species are threats that are brought upon natural communities. There are also non-native animal species that live in Acadia. This issue was brought upon this park by humans whether it was done deliberatly or accidentally.
Atmospheric Deposition
Atmospheric Deposition is caused by the effects of air pollution. Many gases and particles are released in the air from air pollution. Toxins like nitrogen, sulfur, and carbon dioxide settle to the ground as dust or fall to the earth in rain and snow. These pollutants may also fall directly into water bodies or filter into the soil and groundwater. These toxins cause the water to be much more acidic which can threaten amphibians and fish species.