AC4 funded research uses unprecedented field measurements to gather data on real-world vehicular and non-vehicular volatile organic compound (VOC) emissions to characterize emission rates and oxidative aging of various types of organic pollutants and greenhouse gases in the Greater New York City Metropolitan Area.

Drought conditions lead to an increase in summertime ozone in the U.S. Southeast but not the West, highlighting the long-term impact of droughts on atmospheric composition.

Stratospheric ozone information is consistently measured to a high degree of accuracy and can now be used for seasonal forecasting in North America which has major applications such as informing public health and agricultural decisions.

As another example of NOAA’s ongoing atmospheric measurements providing an early warning system to ensure sustainable development on global scales, a new study co-authored by Stephen Montzka of ESRL and supported by the CPO/AC4 program has found that atmospheric concentrations of chlorinated hydrocarbon (dichloromethane) gas have increased by a factor of 2 since the late 1990s throughout the globe.