Wash. Crossing Air Monitoring Station, Titusville, New Jersey | CASTNET

Wash. Crossing is an air monitoring station located in Washington Crossing State Park, Titusville, New Jersey, United States. It operates under the Clean Air Status and Trends Network (CASTNET), a national program that measures ambient air quality and atmospheric deposition. The station is situated in a rural setting within Mercer County, providing background air quality data representative of the region. The station is operated by Mactec, Inc. and reports to the U.S. Environmental Protection Agency (EPA). As part of CASTNET, it monitors criteria pollutants, ozone, and meteorological parameters, contributing to the EPA's Air Quality System (AQS). The network follows rigorous quality assurance protocols to ensure data accuracy and comparability across sites. Wash. Crossing plays a key role in tracking long-term trends in air quality and atmospheric deposition in the northeastern United States. Its data supports regulatory compliance assessments under the Clean Air Act and informs policy decisions on emission reductions. The station's rural location helps distinguish regional background pollution from local sources.

The station is situated in a mixed forest ecosystem within Washington Crossing State Park, providing a representative background site for the Mid-Atlantic region. Its measurements of ozone, sulfur dioxide, and nitrogen compounds are critical for understanding regional air pollution transport and deposition. The site's long-term record supports trend analysis for ecosystem health, including effects on forests and waterways.