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Q1) For the following four criteria air pollutants (SO2, NO, O3, PM2.5 and 10)- explain how they are formed any why they are criteria pollutants. List one (and only one) of the criteria air pollutants that is a secondary pollutant. Briefly explain the difference between primary standards and secondary standards.
Q2) Choose two chemicals from the list of 189 “air toxics” (visit: http://www.epa.gov/ttn/atw/orig189.html). Give at least three steps that a business can take to approach air pollution from these substances.
