The ideal filter is polycarbonate, which comes in a variety of pore sizes. The most common pore size used in stack sampling is 0.4µm. Smaller pore sizes (0.2µm and even 0.1µm) are sometimes used.

SO 3 emissions from coal-fired power plants are extremely variable and can range from less than 1 ppm to over 30 ppm. Although SO 3 emissions are not directly regulated, their contribution to PM ...

SAHIWAL: As tehsil Sahiwal’s air quality index (AQI) is unhealthy, the local Environmental Protection Department (EPD) has decided to go for a departmental stack emission monitoring of seven ...