They are so small you can’t see them with the naked eye, but the state isnow monitoring the air for little tiny particles of ash and dust. Departmentof Natural Resources Air Quality Specialist Brian Button says the state hasadded some new air monitoring machines that do a better job of finding smallparticles.Button says federal officials just recently determined the small particleswere a hazard. He says the new machines make a big advance in finding smallparticles.He says the state has been gradually expanding the air monitoring system asnew federal regulations dictate.Button says the monitors give a good picture of air quality in Iowa.One of the 23 new monitors is working in Mason City. There are 40 air qualitymonitors statewide.