Levels of arsenic in Northern Ontario’s Long Lake are so high that some local residents can no longer drink the water.

The presence of PFAS in New Zealand wastewaters, coastal waters, and surface waters has been confirmed by University of Auckland researchers.

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.