ID: 2256

AQSQID: 250250044

Site Name: Boston-Von Hillern

Added: April 21, 2020, 6:24 p.m.

Updated: Jan. 25, 2021, 4:31 a.m.

Location: Boston (S Boston), MA

Reporting: True, Located: True

Current AQI: 17.0

Boston (S Boston) MA, US: 42.325197, -71.056056

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Jan. 25, 2021, 2 a.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A 0.01 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 25, 2021, 1 a.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A 0.0 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 25, 2021, midnight 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A 0.02 ppb (0) N/A 3.0 μg/m3 (13) 13.0
 
Jan. 24, 2021, 11 p.m. 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A 0.03 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 24, 2021, 10 p.m. 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A 0.01 ppb (0) N/A 2.0 μg/m3 (9) 11.0
 
Jan. 24, 2021, 9 p.m. 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A 0.01 ppb (0) N/A 1.0 μg/m3 (5) 11.0
 
Jan. 24, 2021, 8 p.m. 8.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 24, 2021, 7 p.m. 7.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 24, 2021, 6 p.m. 8.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 24, 2021, 5 p.m. 8.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 24, 2021, 4 p.m. 8.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 24, 2021, 3 p.m. 9.0 ppb (9) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 24, 2021, 2 p.m. 8.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 24, 2021, 1 p.m. 8.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 24, 2021, noon 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 24, 2021, 11 a.m. 9.0 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 24, 2021, 10 a.m. 9.0 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 24, 2021, 9 a.m. 9.0 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 24, 2021, 8 a.m. 9.0 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 24, 2021, 7 a.m. 7.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 24, 2021, 6 a.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 24, 2021, 5 a.m. 9.0 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.02 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 24, 2021, 4 a.m. 10.0 ppb (10) 3.0 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A 0.05 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 24, 2021, 3 a.m. 8.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.02 ppb (0) N/A 3.0 μg/m3 (13) 13.0
 
Jan. 24, 2021, 2 a.m. 8.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.02 ppb (0) N/A 3.0 μg/m3 (13) 13.0
 
Jan. 24, 2021, 1 a.m. 9.0 ppb (9) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 24, 2021, midnight 10.0 ppb (10) 3.0 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A 0.02 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 23, 2021, 11 p.m. 12.0 ppb (12) 4.0 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A 0.02 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 23, 2021, 10 p.m. 12.0 ppb (12) 4.0 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A 0.03 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 23, 2021, 9 p.m. 12.0 ppb (12) 4.0 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A 0.02 ppb (0) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 23, 2021, 8 p.m. 13.0 ppb (13) 6.0 ppb (6) N/A 7.0 ppb (7) N/A N/A N/A 0.0 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 23, 2021, 7 p.m. 12.0 ppb (12) 5.0 ppb (5) N/A 7.0 ppb (7) N/A N/A N/A 0.0 ppb (0) N/A 0.0 μg/m3 (0) 12.0
 
Jan. 23, 2021, 6 p.m. 12.0 ppb (12) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 23, 2021, 5 p.m. 12.0 ppb (12) 5.0 ppb (5) N/A 7.0 ppb (7) N/A N/A N/A 0.01 ppb (0) N/A 7.0 μg/m3 (30) 30.0
 
Jan. 23, 2021, 4 p.m. 11.0 ppb (11) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A N/A 0.01 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 23, 2021, 3 p.m. 12.0 ppb (12) 5.0 ppb (5) N/A 7.0 ppb (7) N/A N/A N/A 0.01 ppb (0) N/A 3.0 μg/m3 (13) 13.0
 
Jan. 23, 2021, 2 p.m. 13.0 ppb (13) 6.0 ppb (6) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Jan. 23, 2021, 1 p.m. 14.0 ppb (14) 6.0 ppb (6) N/A 9.0 ppb (9) N/A N/A N/A 0.03 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 23, 2021, noon 18.0 ppb (17) 6.0 ppb (6) N/A 11.0 ppb (11) N/A N/A N/A 0.04 ppb (0) N/A 8.0 μg/m3 (34) 34.0
 
Jan. 23, 2021, 11 a.m. 17.0 ppb (17) 5.0 ppb (5) N/A 12.0 ppb (12) N/A N/A N/A 0.04 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 23, 2021, 10 a.m. 15.0 ppb (15) 5.0 ppb (5) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 23, 2021, 9 a.m. 11.0 ppb (11) 2.0 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 23, 2021, 8 a.m. 12.0 ppb (12) 2.0 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 23, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A N/A 0.01 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 23, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
Jan. 23, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A N/A 0.02 ppb (0) N/A 3.0 μg/m3 (13) 13.0
 
Jan. 23, 2021, 4 a.m. 17.0 ppb (17) 3.0 ppb (3) N/A 13.0 ppb (13) N/A N/A N/A 0.12 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 23, 2021, 3 a.m. 29.0 ppb (28) 8.0 ppb (8) N/A 20.0 ppb (19) N/A N/A N/A 0.25 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 23, 2021, 2 a.m. 21.0 ppb (20) 6.0 ppb (6) N/A 15.0 ppb (15) N/A N/A N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 23, 2021, 1 a.m. 18.0 ppb (17) 5.0 ppb (5) N/A 13.0 ppb (13) N/A N/A N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 23, 2021, midnight 17.0 ppb (17) 4.0 ppb (4) N/A 12.0 ppb (12) N/A N/A N/A 0.1 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 22, 2021, 11 p.m. 22.0 ppb (21) 7.0 ppb (7) N/A 15.0 ppb (15) N/A N/A N/A 0.14 ppb (2) N/A 8.0 μg/m3 (34) 34.0
 
Jan. 22, 2021, 10 p.m. 28.0 ppb (27) 9.0 ppb (9) N/A 19.0 ppb (18) N/A N/A N/A 0.18 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Jan. 22, 2021, 9 p.m. 26.0 ppb (25) 9.0 ppb (9) N/A 17.0 ppb (17) N/A N/A N/A 0.13 ppb (2) N/A 1.0 μg/m3 (5) 25.0
 
Jan. 22, 2021, 8 p.m. 27.0 ppb (26) 11.0 ppb (11) N/A 15.0 ppb (15) N/A N/A N/A 0.11 ppb (2) N/A 5.0 μg/m3 (21) 26.0
 
Jan. 22, 2021, 7 p.m. 28.0 ppb (27) 12.0 ppb (12) N/A 16.0 ppb (16) N/A N/A N/A 0.1 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
Jan. 22, 2021, 6 p.m. 27.0 ppb (26) 12.0 ppb (12) N/A 15.0 ppb (15) N/A N/A N/A 0.09 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 22, 2021, 5 p.m. 30.0 ppb (29) 16.0 ppb (16) N/A 14.0 ppb (14) N/A N/A N/A 0.13 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 22, 2021, 4 p.m. 40.0 ppb (38) 22.0 ppb (21) N/A 18.0 ppb (17) N/A N/A N/A 0.14 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 22, 2021, 3 p.m. 46.0 ppb (44) 26.0 ppb (25) N/A 21.0 ppb (20) N/A N/A N/A 0.18 ppb (3) N/A 14.0 μg/m3 (55) 55.0
 
Jan. 22, 2021, 2 p.m. 74.0 ppb (73) 47.0 ppb (45) N/A 27.0 ppb (26) N/A N/A N/A 0.33 ppb (4) N/A 19.0 μg/m3 (66) 73.0
 
Jan. 22, 2021, 1 p.m. 91.0 ppb (91) 59.0 ppb (57) N/A 32.0 ppb (31) N/A N/A N/A 0.4 ppb (5) N/A 17.0 μg/m3 (62) 91.0
 
Jan. 22, 2021, noon 122.0 ppb (105) 87.0 ppb (87) N/A 35.0 ppb (34) N/A N/A N/A 0.6 ppb (7) N/A 16.0 μg/m3 (60) 105.0
 
Jan. 22, 2021, 11 a.m. 113.0 ppb (104) 78.0 ppb (77) N/A 35.0 ppb (34) N/A N/A N/A 0.51 ppb (6) N/A 21.0 μg/m3 (70) 104.0
 
Jan. 22, 2021, 10 a.m. 54.0 ppb (51) 25.0 ppb (24) N/A 28.0 ppb (27) N/A N/A N/A 0.23 ppb (3) N/A 16.0 μg/m3 (60) 60.0
 
Jan. 22, 2021, 9 a.m. 43.0 ppb (41) 15.0 ppb (15) N/A 28.0 ppb (27) N/A N/A N/A 0.17 ppb (3) N/A 16.0 μg/m3 (60) 60.0
 
Jan. 22, 2021, 8 a.m. 38.0 ppb (36) 12.0 ppb (12) N/A 26.0 ppb (25) N/A N/A N/A 0.11 ppb (2) N/A 14.0 μg/m3 (55) 55.0
 
Jan. 22, 2021, 7 a.m. 29.0 ppb (28) 6.0 ppb (6) N/A 23.0 ppb (22) N/A N/A N/A 0.11 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 22, 2021, 6 a.m. 32.0 ppb (31) 6.0 ppb (6) N/A 25.0 ppb (24) N/A N/A N/A 0.15 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 22, 2021, 5 a.m. 32.0 ppb (31) 6.0 ppb (6) N/A 26.0 ppb (25) N/A N/A N/A 0.17 ppb (3) N/A 13.0 μg/m3 (53) 53.0
 
Jan. 22, 2021, 4 a.m. 36.0 ppb (34) 9.0 ppb (9) N/A 27.0 ppb (26) N/A N/A N/A 0.28 ppb (4) N/A 16.0 μg/m3 (60) 60.0
 
Jan. 22, 2021, 3 a.m. 43.0 ppb (41) 13.0 ppb (13) N/A 31.0 ppb (30) N/A N/A N/A 0.36 ppb (5) N/A 17.0 μg/m3 (62) 62.0
 
Jan. 22, 2021, 2 a.m. 51.0 ppb (49) 18.0 ppb (17) N/A 33.0 ppb (32) N/A N/A N/A 0.41 ppb (5) N/A 14.0 μg/m3 (55) 55.0
 
Jan. 22, 2021, 1 a.m. 87.0 ppb (87) 50.0 ppb (48) N/A 37.0 ppb (35) N/A N/A N/A 0.63 ppb (7) N/A 15.0 μg/m3 (58) 87.0
 
Jan. 22, 2021, midnight 79.0 ppb (78) 42.0 ppb (40) N/A 36.0 ppb (34) N/A N/A N/A 0.55 ppb (7) N/A 12.0 μg/m3 (50) 78.0
 
Jan. 21, 2021, 11 p.m. 60.0 ppb (58) 26.0 ppb (25) N/A 34.0 ppb (33) N/A N/A N/A 0.42 ppb (5) N/A 12.0 μg/m3 (50) 58.0
 
Jan. 21, 2021, 10 p.m. 54.0 ppb (51) 22.0 ppb (21) N/A 32.0 ppb (31) N/A N/A N/A 0.34 ppb (4) N/A 12.0 μg/m3 (50) 51.0
 
Jan. 21, 2021, 9 p.m. 50.0 ppb (48) 20.0 ppb (19) N/A 30.0 ppb (29) N/A N/A N/A 0.32 ppb (4) N/A 13.0 μg/m3 (53) 53.0
 
Jan. 21, 2021, 8 p.m. 45.0 ppb (43) 19.0 ppb (18) N/A 26.0 ppb (25) N/A N/A N/A 0.21 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 21, 2021, 7 p.m. 41.0 ppb (39) 19.0 ppb (18) N/A 22.0 ppb (21) N/A N/A N/A 0.16 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 21, 2021, 6 p.m. 40.0 ppb (38) 19.0 ppb (18) N/A 21.0 ppb (20) N/A N/A N/A 0.1 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 21, 2021, 5 p.m. 32.0 ppb (31) 15.0 ppb (15) N/A 17.0 ppb (17) N/A N/A N/A 0.1 ppb (2) N/A N/A 31.0
 
Jan. 21, 2021, 4 p.m. 36.0 ppb (34) 17.0 ppb (17) N/A 19.0 ppb (18) N/A N/A N/A 0.08 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 21, 2021, 3 p.m. 41.0 ppb (39) 19.0 ppb (18) N/A 21.0 ppb (20) N/A N/A N/A 0.12 ppb (2) N/A N/A 39.0
 
Jan. 21, 2021, 2 p.m. 53.0 ppb (50) 27.0 ppb (26) N/A 26.0 ppb (25) N/A N/A N/A 0.1 ppb (2) N/A 7.0 μg/m3 (30) 50.0
 
Jan. 21, 2021, 1 p.m. 59.0 ppb (57) 31.0 ppb (30) N/A 28.0 ppb (27) N/A N/A N/A 0.19 ppb (3) N/A 6.0 μg/m3 (25) 57.0
 
Jan. 21, 2021, noon 66.0 ppb (64) 36.0 ppb (34) N/A 29.0 ppb (28) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 64.0
 
Jan. 21, 2021, 11 a.m. 63.0 ppb (61) 34.0 ppb (33) N/A 29.0 ppb (28) N/A N/A N/A 0.18 ppb (3) N/A 6.0 μg/m3 (25) 61.0
 
Jan. 21, 2021, 10 a.m. 35.0 ppb (34) 16.0 ppb (16) N/A 20.0 ppb (19) N/A N/A N/A 0.06 ppb (2) N/A 6.0 μg/m3 (25) 34.0
 
Jan. 21, 2021, 9 a.m. 25.0 ppb (24) 8.0 ppb (8) N/A 17.0 ppb (17) N/A N/A N/A 0.05 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 21, 2021, 8 a.m. 12.0 ppb (12) 2.0 ppb (2) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 21, 2021, 7 a.m. 11.0 ppb (11) 1.0 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Jan. 21, 2021, 6 a.m. 11.0 ppb (11) 1.0 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 21, 2021, 5 a.m. 9.0 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 21, 2021, 4 a.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A 0.02 ppb (0) N/A 2.0 μg/m3 (9) 10.0
 
Jan. 21, 2021, 3 a.m. 15.0 ppb (15) 3.0 ppb (3) N/A 12.0 ppb (12) N/A N/A N/A 0.01 ppb (0) N/A 2.0 μg/m3 (9) 15.0
 
Jan. 21, 2021, 2 a.m. 11.0 ppb (11) 2.0 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A 0.0 ppb (0) N/A 2.0 μg/m3 (9) 11.0
 
Jan. 21, 2021, 1 a.m. 16.0 ppb (16) 4.0 ppb (4) N/A 12.0 ppb (12) N/A N/A N/A 0.01 ppb (0) N/A 2.0 μg/m3 (9) 16.0
 
Jan. 21, 2021, midnight 16.0 ppb (16) 4.0 ppb (4) N/A 12.0 ppb (12) N/A N/A N/A 0.1 ppb (2) N/A 3.0 μg/m3 (13) 16.0
 
Jan. 20, 2021, 11 p.m. 20.0 ppb (19) 5.0 ppb (5) N/A 15.0 ppb (15) N/A N/A N/A 0.11 ppb (2) N/A 4.0 μg/m3 (17) 19.0
 
Jan. 20, 2021, 10 p.m. 20.0 ppb (19) 6.0 ppb (6) N/A 14.0 ppb (14) N/A N/A N/A 0.12 ppb (2) N/A 3.0 μg/m3 (13) 19.0
 
Jan. 20, 2021, 9 p.m. 18.0 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (12) N/A N/A N/A 0.05 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 20, 2021, 8 p.m. 21.0 ppb (20) 8.0 ppb (8) N/A 14.0 ppb (14) N/A N/A N/A 0.05 ppb (2) N/A 8.0 μg/m3 (34) 34.0
 
Jan. 20, 2021, 7 p.m. 21.0 ppb (20) 9.0 ppb (9) N/A 12.0 ppb (12) N/A N/A N/A 0.07 ppb (2) N/A 8.0 μg/m3 (34) 34.0
 
Jan. 20, 2021, 6 p.m. 28.0 ppb (27) 14.0 ppb (14) N/A 14.0 ppb (14) N/A N/A N/A 0.08 ppb (2) N/A 15.0 μg/m3 (58) 58.0
 
Jan. 20, 2021, 5 p.m. 31.0 ppb (30) 16.0 ppb (16) N/A 15.0 ppb (15) N/A N/A N/A 0.08 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 20, 2021, 4 p.m. 39.0 ppb (37) 20.0 ppb (19) N/A 19.0 ppb (18) N/A N/A N/A 0.13 ppb (2) N/A 14.0 μg/m3 (55) 55.0
 
Jan. 20, 2021, 3 p.m. 48.0 ppb (46) 26.0 ppb (25) N/A 22.0 ppb (21) N/A N/A N/A 0.19 ppb (3) N/A 9.0 μg/m3 (38) 46.0
 
Jan. 20, 2021, 2 p.m. 63.0 ppb (61) 37.0 ppb (35) N/A 27.0 ppb (26) N/A N/A N/A 0.26 ppb (4) N/A 12.0 μg/m3 (50) 61.0
 
Jan. 20, 2021, 1 p.m. 67.0 ppb (65) 37.0 ppb (35) N/A 29.0 ppb (28) N/A N/A N/A 0.32 ppb (4) N/A 17.0 μg/m3 (62) 65.0
 
Jan. 20, 2021, noon 87.0 ppb (87) 53.0 ppb (50) N/A 33.0 ppb (32) N/A N/A N/A 0.4 ppb (5) N/A 14.0 μg/m3 (55) 87.0
 
Jan. 20, 2021, 11 a.m. 65.0 ppb (63) 35.0 ppb (34) N/A 30.0 ppb (29) N/A N/A N/A 0.39 ppb (5) N/A 17.0 μg/m3 (62) 63.0
 
Jan. 20, 2021, 10 a.m. 43.0 ppb (41) 19.0 ppb (18) N/A 24.0 ppb (23) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
Jan. 20, 2021, 9 a.m. 29.0 ppb (28) 11.0 ppb (11) N/A 19.0 ppb (18) N/A N/A N/A 0.07 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
Jan. 20, 2021, 8 a.m. 22.0 ppb (21) 6.0 ppb (6) N/A 16.0 ppb (16) N/A N/A N/A 0.01 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 20, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A N/A 0.01 ppb (0) N/A 7.0 μg/m3 (30) 30.0
 
Jan. 20, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A N/A 0.04 ppb (0) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 20, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A N/A 0.09 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 20, 2021, 4 a.m. 18.0 ppb (17) 4.0 ppb (4) N/A 14.0 ppb (14) N/A N/A N/A 0.13 ppb (2) N/A 8.0 μg/m3 (34) 34.0
 
Jan. 20, 2021, 3 a.m. 20.0 ppb (19) 6.0 ppb (6) N/A 14.0 ppb (14) N/A N/A N/A 0.17 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Jan. 20, 2021, 2 a.m. 20.0 ppb (19) 5.0 ppb (5) N/A 15.0 ppb (15) N/A N/A N/A 0.13 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 20, 2021, 1 a.m. 22.0 ppb (21) 7.0 ppb (7) N/A 15.0 ppb (15) N/A N/A N/A 0.16 ppb (3) N/A 4.0 μg/m3 (17) 21.0
 
Jan. 20, 2021, midnight 16.0 ppb (16) 5.0 ppb (5) N/A 12.0 ppb (12) N/A N/A N/A 0.13 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2021, 11 p.m. 20.0 ppb (19) 7.0 ppb (7) N/A 13.0 ppb (13) N/A N/A N/A 0.14 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2021, 10 p.m. 18.0 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (12) N/A N/A N/A 0.09 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2021, 9 p.m. 25.0 ppb (24) 10.0 ppb (10) N/A 16.0 ppb (16) N/A N/A N/A 0.17 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Jan. 19, 2021, 8 p.m. 25.0 ppb (24) 10.0 ppb (10) N/A 15.0 ppb (15) N/A N/A N/A 0.13 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2021, 7 p.m. 27.0 ppb (26) 12.0 ppb (12) N/A 15.0 ppb (15) N/A N/A N/A 0.12 ppb (2) N/A 4.0 μg/m3 (17) 26.0
 
Jan. 19, 2021, 6 p.m. 25.0 ppb (24) 11.0 ppb (11) N/A 14.0 ppb (14) N/A N/A N/A 0.12 ppb (2) N/A 4.0 μg/m3 (17) 24.0
 
Jan. 19, 2021, 5 p.m. 25.0 ppb (24) 12.0 ppb (12) N/A 13.0 ppb (13) N/A N/A N/A 0.07 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2021, 4 p.m. 28.0 ppb (27) 14.0 ppb (14) N/A 14.0 ppb (14) N/A N/A N/A 0.07 ppb (2) N/A 8.0 μg/m3 (34) 34.0
 
Jan. 19, 2021, 3 p.m. 34.0 ppb (33) 17.0 ppb (17) N/A 17.0 ppb (17) N/A N/A N/A 0.07 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 19, 2021, 2 p.m. 37.0 ppb (35) 18.0 ppb (17) N/A 18.0 ppb (17) N/A N/A N/A 0.08 ppb (2) N/A 7.0 μg/m3 (30) 35.0
 
Jan. 19, 2021, 1 p.m. 49.0 ppb (47) 25.0 ppb (24) N/A 24.0 ppb (23) N/A N/A N/A 0.11 ppb (2) N/A 9.0 μg/m3 (38) 47.0
 
Jan. 19, 2021, noon 56.0 ppb (54) 29.0 ppb (28) N/A 27.0 ppb (26) N/A N/A N/A 0.15 ppb (2) N/A 5.0 μg/m3 (21) 54.0
 
Jan. 19, 2021, 11 a.m. 48.0 ppb (46) 25.0 ppb (24) N/A 23.0 ppb (22) N/A N/A N/A 0.15 ppb (2) N/A 5.0 μg/m3 (21) 46.0
 
Jan. 19, 2021, 10 a.m. 36.0 ppb (34) 16.0 ppb (16) N/A 20.0 ppb (19) N/A N/A N/A 0.07 ppb (2) N/A 7.0 μg/m3 (30) 34.0
 
Jan. 19, 2021, 9 a.m. 19.0 ppb (18) 5.0 ppb (5) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 19, 2021, 8 a.m. 13.0 ppb (13) 3.0 ppb (3) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Jan. 19, 2021, 7 a.m. 10.0 ppb (10) 1.0 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2021, 6 a.m. 11.0 ppb (11) 2.0 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 19, 2021, 5 a.m. 11.0 ppb (11) 1.0 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Jan. 19, 2021, 4 a.m. 11.0 ppb (11) 2.0 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A 0.02 ppb (0) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 19, 2021, 3 a.m. 13.0 ppb (13) 3.0 ppb (3) N/A 10.0 ppb (10) N/A N/A N/A 0.09 ppb (2) N/A 1.0 μg/m3 (5) 13.0
 
Jan. 19, 2021, 2 a.m. 14.0 ppb (14) 4.0 ppb (4) N/A 10.0 ppb (10) N/A N/A N/A 0.04 ppb (0) N/A 0.0 μg/m3 (0) 14.0
 
Jan. 19, 2021, 1 a.m. 14.0 ppb (14) 4.0 ppb (4) N/A 10.0 ppb (10) N/A N/A N/A 0.06 ppb (2) N/A 1.0 μg/m3 (5) 14.0
 
Jan. 19, 2021, midnight 14.0 ppb (14) 4.0 ppb (4) N/A 10.0 ppb (10) N/A N/A N/A 0.06 ppb (2) N/A 1.0 μg/m3 (5) 14.0
 
Jan. 18, 2021, 11 p.m. 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A 0.01 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 18, 2021, 10 p.m. 14.0 ppb (14) 4.0 ppb (4) N/A 10.0 ppb (10) N/A N/A N/A 0.02 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2021, 9 p.m. 17.0 ppb (17) 6.0 ppb (6) N/A 11.0 ppb (11) N/A N/A N/A 0.03 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 18, 2021, 8 p.m. 15.0 ppb (15) 6.0 ppb (6) N/A 9.0 ppb (9) N/A N/A N/A 0.04 ppb (0) N/A 3.0 μg/m3 (13) 15.0
 
Jan. 18, 2021, 7 p.m. 22.0 ppb (21) 10.0 ppb (10) N/A 12.0 ppb (12) N/A N/A N/A 0.05 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2021, 6 p.m. 21.0 ppb (20) 10.0 ppb (10) N/A 11.0 ppb (11) N/A N/A N/A 0.05 ppb (2) N/A 8.0 μg/m3 (34) 34.0
 
Jan. 18, 2021, 5 p.m. 19.0 ppb (18) 9.0 ppb (9) N/A 10.0 ppb (10) N/A N/A N/A 0.03 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2021, 4 p.m. 16.0 ppb (16) 8.0 ppb (8) N/A 9.0 ppb (9) N/A N/A N/A 0.02 ppb (0) N/A 8.0 μg/m3 (34) 34.0
 
Jan. 18, 2021, 3 p.m. 22.0 ppb (21) 12.0 ppb (12) N/A 11.0 ppb (11) N/A N/A N/A 0.05 ppb (2) N/A 4.0 μg/m3 (17) 21.0
 
Jan. 18, 2021, 2 p.m. 29.0 ppb (28) 15.0 ppb (15) N/A 14.0 ppb (14) N/A N/A N/A 0.08 ppb (2) N/A 8.0 μg/m3 (34) 34.0
 
Jan. 18, 2021, 1 p.m. 31.0 ppb (30) 16.0 ppb (16) N/A 16.0 ppb (16) N/A N/A N/A 0.09 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 18, 2021, noon 34.0 ppb (33) 15.0 ppb (15) N/A 19.0 ppb (18) N/A N/A N/A 0.14 ppb (2) N/A 7.0 μg/m3 (30) 33.0
 
Jan. 18, 2021, 11 a.m. 28.0 ppb (27) 12.0 ppb (12) N/A 16.0 ppb (16) N/A N/A N/A 0.08 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 18, 2021, 10 a.m. 20.0 ppb (19) 7.0 ppb (7) N/A 13.0 ppb (13) N/A N/A N/A 0.03 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 18, 2021, 9 a.m. 16.0 ppb (16) 5.0 ppb (5) N/A 11.0 ppb (11) N/A N/A N/A 0.01 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2021, 8 a.m. 13.0 ppb (13) 3.0 ppb (3) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2021, 7 a.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2021, 6 a.m. 9.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2021, 5 a.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A 0.03 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2021, 4 a.m. 11.0 ppb (11) 2.0 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A 0.06 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2021, 3 a.m. 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A 0.09 ppb (2) N/A 6.0 μg/m3 (25) 25.0