Emissions of all the following have declined since 1970 EXCEPT A. Small Particulate Matter (PM10)
B. sulfur dioxide
C. ground level ozone
D. nitrogen dioxide
E. carbon dioxide

clinically, some people often have repeated allergies, eczema and respiratory infections or other parts of the infection, in this case, in addition to some routine tests such as tests for white blood cells, immunoglobulin series, lymphocyte subsets, etc., the five immune immunoglobulin tests are also necessary.