SV-TAG sampled for 20 minutes from **:05 to **:25 every hour. Concentrations correspond to total (gas-plus-particle) airborne concentrations. The SV-TAG sampling inlet incorporated a PM2.5 cyclone that removed  particles larger than 2.5 microns.

1) Siloxane concentrations are semi-quantitative. Responses from each siloxane characteristic ion are normalized against the closest alkane internal standard in retention time. Calibration curves from the corresponding alkane external standard are used for quantification. A small systematic increase in the background concentration is observed over time. This increase is expected to be related to the normalization method and is not thought to be physical.

2) Phthalate concentrations were calibrated using authentic external standards where available. (DBP,DEHP)

3) SVOC concentrations were determined for chromatographic bins corresponding to the volatility of the nearest alkane in retention time (“alkane-equivalent volatility bin”) following the approach of Lunderberg et al. 2020. Transient "alkane-equivalent volatility bin" concentrations are reported by subtracting the "total" concentration from the morning background concentration for each day. Rare negative values, often relating to ventilation, were reported as "0".

4) Description of compounds referenced in ICARTT

D10 = a cyclic form of polydimethylsiloxane with a chain-length of 10
D_n = a cyclic form of polydimethylsiloxane with a chain-length of "n"

DIBP = diisobutyl phthalate
DPB = dibutyl phthalate
BBzP = butylbenzyl phthalate
DEHP = diethylhexyl phthalate

C14_bin = transient 'C14 alkane-equivalent volatility bin' concentration
C_n_bin = transient 'C_n alkane-equivalent volatility bin' concentration