Overview
San Jose - 4th St. is an operational air monitoring station in San Jose, California, managed by the California Air Resources Board. It contributes to the US EPA Air Quality System network, tracking criteria pollutants to support public health and reg
San Jose - 4th St. is an air monitoring station located at 120B N 4th St in San Jose, California, within Santa Clara County. Operated by the California Air Resources Board, this station is part of the extensive US EPA Air Quality System (AQS) network, which monitors ambient air quality across the United States. As a fixed-site monitor, it provides critical data on criteria pollutants such as ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide. The station operates under the regulatory framework of the Clean Air Act, with monitoring protocols aligned with EPA standards. California's air quality management is particularly stringent due to the state's unique geography and pollution challenges, including emissions from transportation, industry, and wildfires. The California Air Resources Board oversees a dense network of monitoring stations to ensure compliance with state and federal ambient air quality standards, and San Jose - 4th St. plays a role in this comprehensive system. Located in downtown San Jose, the station serves a densely populated urban area with significant traffic and industrial activity. Its data helps inform local air quality forecasts, health advisories, and regulatory decisions. By contributing to the AQS database, it supports long-term trend analysis and research on air pollution impacts, benefiting both the local community and broader environmental monitoring efforts.
Environmental context
San Jose - 4th St. monitors criteria pollutants in an urban setting with high traffic density and industrial emissions. Its siting is representative of downtown exposure, providing data for regulatory compliance under the Clean Air Act. The station's parameter coverage typically includes ozone, PM2.5, PM10, and nitrogen dioxide, essential for assessing health risks and meeting National Ambient Air Quality Standards (NAAQS). Reporting continuity through the California Air Resources Board ensures reliable data for trend analysis and public reporting.
Frequently asked questions
The station is located at 120B N 4th St in San Jose, California, within Santa Clara County. It operates under the California Air Resources Board.
As part of the EPA Air Quality System, the station typically monitors criteria pollutants such as ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide, in accordance with federal and state standards.
The station provides real-time and historical data used for air quality forecasting, health advisories, and regulatory compliance. Its data supports the California Air Resources Board in assessing attainment of National Ambient Air Quality Standards.
Air monitoring in the US is governed by the Clean Air Act and implemented through the EPA Air Quality System (AQS). States like California have additional programs under the California Air Resources Board to meet stricter state standards.
Urban areas have higher emissions from traffic and industry, leading to elevated pollutant levels. Monitoring helps protect public health by providing data for alerts, policy decisions, and long-term trend analysis to reduce exposure.
Other Air Monitoring Station plants in United States · 6 nearby