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Last summer saw similar trends though they were at first unexpected. In the spring, when lockdowns shut down the city, an assumed silver lining was a reduction in air pollution from vehicle traffic. Ground-level ozone is a byproduct of other pollutants; it forms when nitrogen oxides react with volatile organic compounds, or VOCs. Though both chemicals have a variety of sources including industrial emissions much of the pollution is caused by vehicles. So when traffic dropped off dramatically in the spring of 2020 reducing nitrogen dioxide pollution in the Valley some were hopeful that ozone levels, too, would dip. But they didn’t; ozone levels exceeded standards on 40 days in 2020, about the same as the year prior.

United statesLos angelesArizona department of environmental qualitySociety of professional journalist sigma delta chiNew timesMatthew paceArizona departmentPacific northwestPhoenix new times freePhoenix new timesProfessional journalist sigma delta chiCasey medalஒன்றுபட்டது மாநிலங்களில்லாஸ் ஏஞ்சல்ஸ்அரிசோனா துறை ஆஃப் சுற்றுச்சூழல் தரம்சமூகம் ஆஃப் ப்ரொஃபெஶநல் பத்திரிகையாளர் சிக்மா டெல்டா சி