Nitrogen reacts with oxygen and other chemical compounds to form atmospheric oxides, which significantly impact the chemical composition of our atmosphere, human and environmental health, and broader climate processes. These gases can be produced by a range of natural and anthropogenic sources including fossil fuel combustion and wildfires. The atmospheric chemistry research community has developed new methods to track the emission sources of these gases and their key chemical reactions by analyzing the stable isotopes of nitrogen and oxygen in the gas compounds. However, there is a lack of a well-established method to simultaneously differentiate and quantify the concentration and isotopic composition of multiple groups of nitrogen oxides.

A recent study supported by AC4 uses drought index as a tool to explain the trends of particulate matter (PM) air pollution and its association with wildfires across the US.

A recent study supported by AC4 and COM investigates emissions of the greenhouse gas with the largest known warming potential, updates the understanding of how much we have in the atmosphere, and proposes possible solutions for reducing emissions.

A recent FIREX-AQ study supported by AC4 analyzed emissions and revealed region-specific chemical signals during a controlled burn in the understudied region of Northern Michigan.

A new AC4-supported study published in Nature Communications provides pioneering results on the complex formation of secondary organic aerosol air pollutants.