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Comparison of normalized reactivity vs. whole filter particle mass in a) 106 area and b) 105 personal filter samples. Normalized reactivity is the DTT reactivity rate (nmol DTT min−1 mg−1 PM m−3 air) multiplied by the whole filter particle mass (mg PM). The units have been simplified in regards to grams of PM. Error bars represent three replicates of three filter sections.
