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BACKGROUND Ground-level concentrations of ozone (O3) and fine particulate matter [< or = 2.5 microm in aerodynamic diameter (PM2.5)] have increased since preindustrial times in urban and rural regions and are associated with cardiovascular and respiratory mortality. OBJECTIVES We estimated the global burden of mortality due to O3 and PM2.5 from(More)
Background concentrations of tropospheric ozone are increasing and are sensitive to methane emissions, yet methane mitigation is currently considered only for climate change. Methane control is shown here to be viable for ozone management. Identified global abatement measures can reduce approximately 10% of anthropogenic methane emissions at a cost-savings,(More)
Methane (CH(4)) contributes to the growing global background concentration of tropospheric ozone (O(3)), an air pollutant associated with premature mortality. Methane and ozone are also important greenhouse gases. Reducing methane emissions therefore decreases surface ozone everywhere while slowing climate warming, but although methane mitigation has been(More)
[1] Changes in emissions of ozone (O 3) precursors affect both air quality and climate. We first examine the sensitivity of surface O 3 concentrations (O 3 srf) and net radiative forcing of climate (RF net) to reductions in emissions of four precursors – nitrogen oxides (NO x), non-methane volatile organic compounds, carbon monoxide, and methane (CH 4). We(More)
BACKGROUND Tropospheric ozone and black carbon (BC), a component of fine particulate matter (PM ≤ 2.5 µm in aerodynamic diameter; PM(2.5)), are associated with premature mortality and they disrupt global and regional climate. OBJECTIVES We examined the air quality and health benefits of 14 specific emission control measures targeting BC and methane, an(More)
Actions to reduce greenhouse gas (GHG) emissions often reduce co-emitted air pollutants, bringing co-benefits for air quality and human health. Past studies(1-6) typically evaluated near-term and local co-benefits, neglecting the long-range transport of air pollutants(7-9), long-term demographic changes, and the influence of climate change on air(More)
[1] Over the past century, atmospheric methane (CH 4) rose dramatically before leveling off in the late 1990s. The processes controlling this trend are poorly understood, limiting confidence in projections of future CH 4. The MOZART-2 global tropospheric chemistry model qualitatively captures the observed CH 4 trend (increasing in the early 1990s and then(More)
[1] Reducing methane (CH 4) emissions is an attractive option for jointly addressing climate and ozone (O 3) air quality goals. With multidecadal full-chemistry transient simulations in the MOZART-2 tropospheric chemistry model, we show that tropospheric O 3 responds approximately linearly to changes in CH 4 emissions over a range of anthropogenic emissions(More)
A 159 using more recent data is unlikely to change that conclusion (see Appendix of Jerrett et al. 2009). Finally, national risk estimates are more applicable globally than city-specific estimates because they include larger and more diverse populations. However, because the evidence for chronic ozone mortality is more limited than the large body of(More)