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Latest 24-hour Average O₃ Concentration (ppm)
<0.02
<0.04
<0.06
<0.07
<0.09
<0.11
<0.13
<0.15
≥0.15
2018 Estimated NOₓ Emissions (Tg/year) from Total Sectors
≤3.7 x 10^-8
≤3.7 x 10^-7
≤3.7 x 10^-5
≤3.7 x 10^-4
≤3.7 x 10^-3
≤3.7 x 10^-1
Legend