Table 3.

Comparison of the median RMSE (μg/m³) for PM_2.5 from 1-week calibration periods with different coverages of temperature and RH conditions. Only calibration periods with more than 50% coverage of the PM_2.5 concentration range were included in the table (>50% corresponds to 26 μg/m³ or more in this dataset). For four scenarios (e.g., PM_2.5 coverage > 50%, RH Coverage > 50%, T Coverage > 20%), the 1^st percentile RMSE, 99^th percentile RMSE, and the percentage of calibrations that exhibited all required conditions (e.g., RH > X % and T > X%) are shown (1^st - 99^th percentile; %). For comparison, the median (1^st - 99^th percentile) of the PM_2.5 1-week calibration periods from the full data set (i.e., no coverage requirements) was 6.6 μg/m³ (3.1 – 18.3 μg/m³).

PM2 5 RMSE from 1-week calibrations with > 50% concentration coverage		Increasing Temperature Data Coverage ---->
		T range > Δ10°C (Coverage >~20%)	T range > Δ15°C (Coverage >~30%)	T range > Δ20°C (Coverage >~40%)	T range > Δ25°C (Coverage >~50%)	T range > Δ30°C (Coverage >~60%)
Increasing RH Data Coverage <----	RH range > Δ40% (Coverage >~50%)	4.7 (3.2 – 17.2; 21%)	4.7	4.7	4.4	3.8 (3.3 – 11.5; 2%)
	RH range > Δ48% (Coverage >~60%)	4.7	4.7	4.7	4.4	3.7
	RH range > Δ56% (Coverage >~70%)	4.3	4.3	4.4	4.3	3.7
	RH range > Δ64% (Coverage >~80%)	4.3	4.3	4.3	4.1	3.7
	RH range > Δ72% (Coverage >~90%)	4.2 (3.2 – 6.8; 7%)	4.2	4.3	3.9	3.6 (3.2 – 3.7; 1%)