Smog Pollution

It's hard to filter the waste from burning 4 BILLION METRIC TONS of coal per year.

Think about it. Please!

"The suspended particle is far more harmful than CO2, the health damaging effect is almost immediate, rather than decades as in CO2 ."
Where are you being exposed to CO2 levels that high for that long?

The levels of CO2 in the air and potential health problems are:

• 250 - 350 ppm - background (normal) outdoor air level
• 350- 1,000 ppm - typical level found in occupied spaces with good air exchange.
• 1,000 - 2,000 ppm - level associated with complaints of drowsiness and poor air.
• 2,000 - 5,000 ppm - level associated with headaches, sleepiness, and stagnant, stale, stuffy air. Poor concentration, loss of attention, increased heart rate and slight nausea may also be present.
• >5,000 ppm - this indicates unusual air conditions where high levels of other gases could also be present. Toxicity or oxygen deprivation could occur. This is the permissible exposure limit for daily workplace exposures.
• >40,000 ppm - this level is immediately harmful due to oxygen deprivation.

I think you miss the point. Problem caused by smog is different from that caused by CO2. I beleive the green house effect will happen way earlier than the poisoning effect of high ppm level of CO2 in atmosphere. Smog is fine particle. The smog will cause respiratory problem even if CO2 ppm is low.

Yes, scrubbing is the right term for it. My doubt is, scrubbing should be effective in removing large percentage if not all particle from exhaust of coal burning funace, if need be multiple stages of water tank. Engineering wise, this is easy, money wise, China govt has tons of them . But the problem seems very big, the China govt seems helpless to solve this problem for decades. The last I read, the smog level in Beijing is like > 5x the permitted level. There must be a reason why srubbing is not used to solve or reduce this problem. I just wonder why?

In my considerable experience, particulates were removed with electrostatic precipitators and later with baghouses, scrubbers are used to remove SO₂. I believe that there were some scrubbers that tried to do both early on.

The smog we had in London had SO₂ in addition to the particulates and water vapor, it tended to be a dirty, greenish yellow color. I remember the "Great Smog" of 1952. I think the wiki article has a breakdown of the constituents and effects, the effects as listed are not exagerations.

Live and learn. The problem your facing is one of greed. In your government effort to become this power house they cut corners. Which is some of the reason the business came their way in the first place. In most of the world regulations were in place to reduce pollution. Some of these businesses chose to relocate in order to cut costs. One of the costs was the building and maintaining scrubbers to reduce pollution. Not mention other pollution control infrastructure. It's not that your government didn't know.

There is and was plenty of technology available on pollution control equipment.