A dark, rainy spring gave way to a vast, long-lived phytoplankton bloom off the coast of Brazil.

CIRES, CU Boulder and NOAA scientists move fast to understand the impacts of post-fire smoke on indoor and outdoor air quality

Earth’s ozone layer is critical to protecting us from cancer-causing ultraviolet light from the sun

The world's oceans are hotter than ever before, continuing their record-breaking temperature streak for the sixth straight year. 

New research from NOAA and CIRES finds that wildfire smoke is much more widespread and plays a much bigger role in contributing to ozone pollution than previously thought.

Arlene Fiore uses satellite data paired with ground observations to refine our understanding of ozone smog and interactions with meteorology and climate.

Modelling studies highlight the urgent need to improve air quality in cities and reduce exposure to pollution, particularly among children and the elderly.

Carbon dioxide (CO2) levels today are higher than at any point in the past 800,000 years or more.

Even while skies are clearing over China, one type of particulate pollution continues to cause problems.

Nearly 2 million new cases of pediatric asthma every year may be caused by a traffic-related air pollutant—a problem particularly important in large cities around the world—according to a new study published by George Washington University Milken Institute School of Public Health researchers.