Oh, nice. That's putting fly ash in concrete, correct? That makes good concrete. Classic Roman concrete sometimes used volcanic ash and was very long-lived. If you don't have a volcano handy, fly ash from a high-temperature coal fired power plant works about the same.[1] Fly ash is captured from stack gases using electrostatic precipitators. Bottom ash is what comes out the bottom, and that's used to make cinder blocks. Sulfur dioxide, nitrogen oxides, and CO2 still come out as pollution, but at least they don't settle out as soot.
[1] https://www.sciencedirect.com/science/article/abs/pii/S09213...