Grand Teton National Park is more than air distance from any major urban or industrial area, and localized human activities have generally had a very low environmental impact on the surrounding region. However, levels of ammonium and nitrogen have been trending slightly upwards due to deposition from rain and snow that is believed to originate from regional agricultural activities. Additionally, there has also been a slight increase in mercury and pesticides that have been detected in snow and some alpine lakes. Ozone and haze may be impacting overall visibility levels. Grand Teton National Park, in partnership with other agencies, erected the first air quality monitoring station in the park in 2011. The station is designed to check for various pollutants as well as ozone levels and weather.