This study examines ethylamine reactions with organic aerosols, showing secondary ozonides react more slowly than carboxylic acids or aldehydes, with decreasing reactivity as carbon chains lengthen. Advanced techniques revealed key intermediates (hydroxyl peroxyamines, amino hydroperoxides) and novel pathways, establishing a quantitative framework linking molecular processes to aerosol aging for atmospheric chemistry models.

It is essential to understand how biologically productive oceanic regions during spring phytoplankton blooms after sea ice melting contribute to the sea-to-air emission flux of atmospheric organic aerosols (OAs) in the subarctic oceans. Our shipboard measurements highlight the preferential formation of N-containing secondary water-soluble OAs associated with the predominant diatoms including ice algae during the bloom after sea ice melting/retreat in the subarctic ocean.

The effective radiative forcing due to the effect of aviation soot on natural cirrus clouds is likely very small, thus confirming most previous studies, but for the first time with the support of laboratory measurements specifically targeting aviation soot and its ice nucleation ability.

This study finds that oxygenated organic gases play a much greater role in ozone pollution than previously known. Based on detailed air measurements and modeling, the research shows these gases strongly influence radicals and ozone formation. Overlooking them may lead to ineffective policies. The findings highlight the need for better measurement of these gases to improve pollution forecasts and support smarter air quality strategies.