NOACA issues yearly reports to present information on air quality trends in Ashtabula, Cuyahoga, Geauga, Lake, Lorain, Medina, Portage, and Summit counties for the six criteria pollutants: carbon monoxide, lead, nitrogen dioxide, ozone, particulate matter, and sulfur dioxide. View the reports here.

Air Quality Trends Reports:

• 2025 Air Quality Trends Report (April 2026)
• 2024 Air Quality Trends Report (April 2025)
• 2023 Air Quality Trends Report (April 2024)
• 2022 Air Quality Trends Report (March 2023)
• 2021 Air Quality Trends Report (March 2022)
• 2020 Air Quality Trends Report (March 2021)
• 2019 Air Quality Trends Report (April 2020)
• 2018 Air Quality Trends Report (April 2019)
  • Visual Information Card
• 2017 Air Quality Trends Report (December 2017)
• 2016 Air Quality Trends Report (April 2017)

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