**Core Concept**
The monitoring of air pollution involves the measurement of various parameters such as particulate matter (PM), ozone (O3), nitrogen dioxide (NO2), sulfur dioxide (SO2), carbon monoxide (CO), and volatile organic compounds (VOCs). These parameters are crucial in assessing the impact of air pollution on human health and the environment.

**Why the Correct Answer is Right**
The monitoring of air pollution is typically done using a combination of stationary and mobile monitoring systems. Stationary systems include fixed-site monitors, which measure the concentration of pollutants at a specific location, while mobile systems use vehicles equipped with portable monitors to measure pollutant levels in different areas. The correct answer options include common methods used for monitoring air pollution, such as particulate matter (PM) monitors, ozone (O3) analyzers, and nitrogen dioxide (NO2) analyzers.

**Why Each Wrong Option is Incorrect**
**Option A:** Not Provided
**Option B:** Not Provided
**Option C:** Not Provided

**Clinical Pearl / High-Yield Fact**
The World Health Organization (WHO) recommends using a combination of monitoring methods to assess air pollution, including fixed-site monitors, mobile monitors, and satellite-based monitoring systems. This approach provides a comprehensive understanding of air pollution levels and trends.

**Correct Answer:** D.