We use a global chemical transport model (GEOSChem) to evaluate the consistency of satellite measurements of lightning flashes and ozone precursors with in situ measurements of tropical tropospheric ozone. The measurements are tropospheric O3, NO2, and HCHO columns from the GOME satellite instrument, lightning flashes from the OTD and LIS satellite instruments, profiles of O3, CO, and relative ...

BACKGROUND Ambient monitoring data show spatial gradients in ozone (O3) across urban areas. Nitrogen oxide (NOx) emissions reductions will likely alter these gradients. Epidemiological studies often use exposure surrogates that may not fully account for the impacts of spatially and temporally changing concentrations on population exposure. OBJECTIVES We examined the impact of large NOx decrea...

We present a novel technique to retrieve ozone profiles, and especially, tropospheric ozone (O3) from airborne Ultraviolet-Visible (UV) spectrometer measurements. The profile retrieval is possible by viewing a variety of zenith angles from down-looking and up-looking directions, taking advantage of O3 absorption in the Huggins (300-340 nm) and the Chappuis bands (530-650 nm). Measurements are n...

The impact of the East Asian monsoon (EAM) on climatology and interannual variability of tropospheric ozone (O3) over the coastal South China was investigated by analyzing 11 years of ozonesonde data over Hong Kong with the aid of Lagrangian dispersion modeling of carbon monoxide and calculation of an EAM index. It was found that the seasonal cycle of O3 in the lower troposphere is highly relat...

BACKGROUND Sex differences have been described in a number of pulmonary diseases. However, the impact of ozone exposure followed by pneumonia infection on sex-related survival and macrophage function have not been reported. The purpose of this study was to determine whether ozone exposure differentially affects: 1) survival of male and female mice infected with Klebsiella pneumoniae, and 2) the...

Since the dark ozonation of frozen NaCl/NaBr solutions is known to exhibit a (nonlinear) [O3] dependence (Oldridge and Abbatt, 2011), and the observed photochemical dihalogen production may be sensitive to the extent of bromide ion depletion and the gas phase concentration of the dihalogens themselves, the effect of [O3] on the photochemical dihalogen production was investigated in experiments ...

We have synthesized ozone by irradiating thin solid ®lms of oxygen and oxygen±water mixtures with 100 keV protons, motivated by recent reports of condensed O3 on icy satellites in the outer Solar system. We measured the depth of the Hartley absorption band in the ultraviolet by re ̄ectance spectroscopy and used it to quantify the column density of ozone. We analyzed the results using a three-com...

Background: Today, air pollution is one of the major problems in large cities including Isfahan. Methods: The objective of this study was to investigate the variations of ozone (O3), carbon monoxide (CO), nitric oxide (NO), nitrogen dioxide (NO2), nitrogen oxides (NOx), sulphur dioxide (SO2), and particulate matter (PM10) concentrations in different months at three stations and also to explore ...

In situ measurements of ozone (O3), carbon monoxide (CO) and meteorological parameters were made from December 2007 to November 2009 at the Xianggelila Regional Atmosphere Background Station (28.006 N, 99.726 E; 3580 m a.s.l.), southwest China. It was found that both O3 and CO peaked in spring while the minima of O3 and CO occurred in summer and winter, respectively. A normalized indicator (mar...

Saplings of six Finnish hybrid aspen (Populus tremuloides Michx. x P. tremula L.) clones were exposed to 0, 50, 100 and 150 ppb ozone (O3) for 32 days in a chamber experiment to determine differences in O3 sensitivity among genotypes. Based on the chamber experiment, three clones with intermediate sensitivity to O3 were selected for a free-air O3 enrichment experiment in which plants were expos...