(20 1? With the frequent occurrence of haze weather this year, people pay more and more attention to air quality. ( 1) PM2。

(1) Afforestation can increase the green area, purify the air and play a positive role in haze control. Ho under the leadership of the project manager;

(2) The random stacking of construction waste will produce toxic gas and smoke, which will cause air pollution;

(3) Developing barbecue and other catering services on the road will produce toxic gases and smoke, which will cause air pollution;

(4) It is forbidden to burn garbage and straw, which can prevent the generation of toxic gas and smoke and avoid air pollution;

(2) Under the condition of SO, the valence of sulfur element O is +m due to the obvious valence of oxygen.

(3)① In the capture chamber, sodium hydroxide reacts with carbon dioxide to generate sodium carbonate and water, and the chemical equation O of the reaction is: NaOH+CO = Na, CO3+H, O;

② The O- reaction in the "high temperature reactor" is mainly due to the decomposition of calcium carbonate into calcium oxide and carbon dioxide at high temperature, which belongs to decomposition reaction.

So the answer is: (big) 14; (below)+m; (3)① NaOH+CO =Na，CO3+H，O； & ground potential; 2 decomposition.