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PM2.5 is the latest 1-hour reading (µg/m³). Colours show the PSI band each number falls in. 1-hour and 3-hour PSI are calculated here from PM2.5; 24-hour PSI is NEA's official figure.

Past 24 hours

Rolling averages ending at each hour. The PSI view converts PM2.5 with NEA's breakpoints, so its 24-hour line can differ slightly from the official PSI (which also includes other pollutants).

Cigarette equivalent

Rule of thumb from Berkeley Earth: breathing 22 µg/m³ of PM2.5 over 24 hours is roughly one cigarette. An illustration of exposure, not a medical measurement, though it is funny imagining the entire nation all coming together for a smoke

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