Wastewater treatment plays a crucial role in environmental health. Primary treatment removes suspended solids and debris, while secondary treatment addresses dissolved organic matter and pathogens.

There are four main types of industry: primary, secondary ... Buriganga River (Bangladesh), which turns black because of the pollutants. This river used to form part of the end of the Ganges.

The overall research goals are to quantify the emissions of primary pollutants and elucidate the formation mechanisms of secondary pollutants, especially ozone (O 3) and secondary aerosol. Much of ...

The primary pollutant was fire smoke with PM2.5, and secondary pollutants included 1-hour maximum concentrations of carbon monoxide, nitrogen oxides, and sulfur dioxide; the 8-hour maximum ozone ...