Smog, or âground-level ozone,â as it is more wonkily called, occurs when emissions from combusting fossil fuels react with sunlight. Soot, or âparticulate matter,â is made up of tiny particles of chemicals, soil, smoke, dust, or allergens, in the form of gas or solids, that are carried in the air.
Arizona is a U.S. state with two senators in the United States Senate and nine representatives in the United States House of Representatives. Scroll down for a map of the districts.
1 In the Arizona State Senate, there are 12 Democratic incumbents and 18 Republican incumbents. Two incumbents will face primary opposition in the Democratic Party. There is just one primary challenge in the Republican primary.  In the House, there are 24 Democratic incumbents and 36 Republican incumbents.