What specific emissions are primarily monitored in Pennsylvania's emissions testing program?

In Pennsylvania's emissions testing program, the primary focus is on monitoring particulate matter and volatile organic compounds (VOCs). Particulate matter represents a mixture of tiny solid and liquid particles suspended in the air, which can harm respiratory health and contribute to environmental pollution. Monitoring this pollutant helps ensure air quality standards are met and protects public health.

Volatile Organic Compounds are also a significant concern as they are organic chemicals that can easily evaporate and contribute to ground-level ozone formation, which can lead to smog and other environmental issues. Thus, tracking VOC emissions is essential for maintaining air quality and addressing the health risks associated with air pollution.

While carbon monoxide and nitrogen oxides, heavy metals and sulfur dioxide, and aerosols and ozone are all relevant pollutants in the broader context of air quality management, the specific emphasis in Pennsylvania's emissions testing program leans towards particulate matter and VOCs, aligning with the state’s regulatory priorities and public health objectives.