Significant progress has been made in reducing emissions of air pollutants in the San
Joaquin Valley in California. Nevertheless, from May to October, the valley still experiences …

In 2016, the Denver Metro Area (DMA)/Northern Colorado Front Range (NCFR) was
reclassified from a Marginal to a Moderate O3 Non-Attainment Area due to the prevalence of …

The weekend ozone effect refers to changes in ground-level ozone concentrations on
weekends resulting from anthropogenic emission changes from weekdays and weekends …

A national analysis of weekday/weekend ozone (O3) differences conducted using 1997–
1999 data found that many urban areas experienced at least 5% higher 8-hr maximum O3 …

We describe the history and spatial distribution of day-of-week differences in ambient ozone,
NOx, and VOC concentrations through the analysis of two decades of measurements from …

Airborne and ground‐based measurements during the CalNex (California Research at the
Nexus of Air Quality and Climate Change) field study in May/June 2010 show a weekend …

Analysis of pollution data from a network of monitors in Maricopa County, Arizona, reveals
considerable variation in the magnitude of the ozone “weekend effect” depending on how …

Day-of-week patterns in human activities can be used to examine the ways in which
differences in primary emissions result in changes in the rates of photochemical reactions …

Contrary to most regions in the US, ozone in the northern Front Range metropolitan area
(NFRMA) of Colorado was either stagnant or increasing between 2000 and 2015, despite …

A national analysis of weekday/weekend ozone (O3) differences demonstrates significant
variation across the country. Weekend 1-hr or 8-hr maximum O3 varies from 15% lower than …