6/25/2023 0 Comments Risa 3d mass![]() ![]() ![]() ![]() metropolitan areas still violate the 8-hour ozone standard as regulated under the Clean Air Act. The competitively selected projects total $5.48M 1 in grants.ĭespite decades of decline in ground-level ozone and fine particulate matter (PM2.5), many U.S. Emissions, Air Quality, and Heat in Urban AreasĬPO’s Atmospheric Chemistry, Carbon Cycle, and Climate (AC4) program is announcing 10 new 3-year projects and 1 new 2-year project in Fiscal Year 2021 that aim to increase our understanding of emissions and chemical transformation in the urban atmosphere. ![]()
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