Table 2:
Co-located monitors across regions in the period of 2017-2018
| Region | Site IDs | No. Monitors Ever Co-located | Co-location Days with FRM Referencea | Co-location Days with TEOM/BAM Referencea | PM2.5 Concentration (µg/m3) Mean (SD)b,c | Average Temperature (°F) Mean (SD)b,d | Average RH% Mean (SD)b,d |
|---|---|---|---|---|---|---|---|
| Seattle metropolitan | PSCA1e | 24 | --- | 223 (580) | 9.3 (6.2)* | 59 (7) | 70 (12) |
| PSCA2 | 15 | --- | 522 (738) | 6.1 (6.4)* | 57 (10) | 74 (14) | |
| PSCA3 | 52 | 166 (856) | 510 (2320) | 5.6 (3.6) | 53 (8) | 76 (12) | |
| PSCA4 | 1 | 480 (480) | 533 (533) | 8.3 (8.0) | 51 (11) | 84 (14) | |
| PSCA5 | 2 | --- | 439 (439) | 7.4 (6.7)* | 53 (11) | 82 (13) | |
| PSCA6 | 1 | --- | 480 (480) | 8.9 (6.8)* | 58 (8) | 72 (10) | |
| LA | L001 | 7 | 536 (539) | 554 (563) | 12.4 (6.4) | 67 (7) | 64 (13) |
| L(R)002 | 1 | 359 (359) | 363 (363) | 13.7 (9.0) | 66 (8) | 58 (14) | |
| L005 | 1 | 495 (495) | 501 (501) | 12.7 (8.7) | 66 (5) | 66 (12) | |
| Baltimore | B003 | 2 | 131 (131) | --- | 7.9 (4.3) | 60 (12) | 67 (15) |
| B009 | 11 | 352 (857) | 541 (1254) | 8.2 (4.3) | 63 (12) | 66 (16) | |
| B010 | 2 | --- | 590 (590) | 8.9 (3.8)* | 60 (13) | 74 (16) | |
| B011e | 2 | 27 (44) | 294 (463) | 7.0 (3.7) | 59 (14) | 64 (18) | |
| Chicago | C004 | 6 | 100 (101) | 598 (605) | 8.5 (4.3) | 57 (14) | 66 (13) |
| C008 | 1 | 168 (168) | 490 (490) | 7.9 (4.2) | 55 (14) | 68 (14) | |
| C009 | 1 | 195 (195) | --- | 10.7 (5.0) | 56 (14) | 64 (13) | |
| NYC | N001 | 6 | 218 (218) | 366 (370) | 7.5 (3.9) | 59 (13) | 65 (15) |
| N003 | 6 | 219 (221) | --- | 8.0 (4.3) | 58 (13) | 69 (16) | |
| N004 | 1 | --- | 617 (617) | 8.1 (3.3)* | 57 (13) | 65 (16) | |
| N005 | 1 | 54 (54) | 231 (231) | 8.8 (4.2) | 60 (13) | 64 (16) | |
| N006 | 2 | 206 (206) | 612 (613) | 9.2 (4.0) | 59 (13) | 66 (15) | |
| Minneapolis/St. Paul | S001 | 1 | 169 (169) | --- | 8.1 (4.3) | 57 (15) | 59 (14) |
| S005 | 5 | --- | 195 (197) | 7.0 (3.4)* | 60 (12) | 70 (13) | |
| S006e | 1 | 68 (68) | 200 (200) | 6.5 (3.5) | 63 (9) | 68 (13) | |
| Winston - Salem | W001 | 5 | 174 (174) | 270 (278) | 7.7 (3.4) | 64 (11) | 73 (15) |
| W002 | 1 | --- | 265 (265) | 8.2 (3.1)* | 62 (10) | 78 (14) | |
Notes:
- These columns reports unique days (monitor-days) when both LCM data and regulatory station reference data are available. The days presented in the FRM and TEOM/BAM columns overlap considerably, since a day with FRM & FEM reference data will add to both columns.
- The average concentration/temperature/RH values were averaged across daily observations at the site when both LCM and agency reference data were available, and thus depend on co-location schedule which may differ across sites.
- Mean and standard deviation PM2.5 concentrations are calculated using FRM measurements when available. If FRM measurements are not available, then TEOM or BAM measurements are used.
- The average is from FEM monitors.
- The average temperature/RH values were estimated based on the low-cost sensors measurements. Values were calibrated with reference temperature/RH data from the PSCA3 Seattle site in order to present recognizable units.
- Most monitors were co-located and monitored during 2017-2018. Monitors at sites PSCA1 and S006 were deployed and monitored only during 2017 while monitors at site B011 were only deployed during 2018.