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Reactions between hydrocarbons and ozone or hydroxyl radicals lead to theformation of oxidized species, including reactive oxygen species (ROS), andsecondary organic aerosol (SOA) in the troposphere. ROS can be carried deepinto the lungs by small aerodynamic particles where they can cause oxidativestress and cell damage. While environmental studies have focused on ROS inthe gas phase and rainwater, it is also important to determineconcentrations of ROS on respirable particles. Samples of PM2.5collected over 3 h at midday on 40 days during November 2011 andSeptember 2012 show that the particulate ROS concentration in Austin, Texas,ranged from a minimum value of 0.02 nmoles H2O2 m−3 air inDecember to 3.81 nmoles H2O2 m−3 air in September. Resultsfrom correlation tests and linear regression analysis on particulate ROSconcentrations and environmental conditions (which included ozone andPM2.5 concentrations, temperature, relative humidity, precipitation andsolar radiation) indicate that ambient particulate ROS is significantlyinfluenced by the ambient ozone concentration, temperature and incidentsolar radiation. Particulate ROS concentrations measured in this study werein the range reported by other studies in the US, Taiwan and Singapore.This study is one of the first to assess seasonal variations in particulateROS concentrations and helps explain the influence of environmentalconditions on particulate ROS concentrations

atmospheric chemistry and physics

Technical Note: Particulate reactive oxygen species concentrations and their association with environmental conditions in an urban, subtropical climate