AQSQID: 250250044

Site Name: Boston-Von Hillern

Location: Boston, MA

Reporting: True, Located: True

Current AQI: 42.0

Boston MA, US: 42.325197, -71.056056

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Sept. 22, 2019, 7 a.m. 10.0 ppb (9) 0.0 ppb (0) N/A 11.0 ppb (10) N/A N/A N/A 0.35 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 22, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A N/A 0.59 ppb (7) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 22, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A N/A 0.45 ppb (5) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 22, 2019, 4 a.m. 17.0 ppb (16) 1.0 ppb (1) N/A 16.0 ppb (15) N/A N/A N/A 0.47 ppb (5) N/A 14.0 μg/m3 (54) 54.0
 
Sept. 22, 2019, 3 a.m. 19.0 ppb (18) 2.0 ppb (2) N/A 17.0 ppb (16) N/A N/A N/A 0.44 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 22, 2019, 2 a.m. 19.0 ppb (18) 2.0 ppb (2) N/A 17.0 ppb (16) N/A N/A N/A 0.48 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 22, 2019, 1 a.m. 15.0 ppb (14) 1.0 ppb (1) N/A 15.0 ppb (14) N/A N/A N/A 0.38 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 22, 2019, midnight 17.0 ppb (16) 1.0 ppb (1) N/A 16.0 ppb (15) N/A N/A N/A 0.34 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 21, 2019, 11 p.m. 26.0 ppb (24) 1.0 ppb (1) N/A 25.0 ppb (23) N/A N/A N/A 0.51 ppb (6) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 21, 2019, 10 p.m. 23.0 ppb (21) -1.0 ppb (0) N/A 24.0 ppb (22) N/A N/A N/A 0.55 ppb (6) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 21, 2019, 9 p.m. 12.0 ppb (11) 0.0 ppb (0) N/A 12.0 ppb (11) N/A N/A N/A 0.24 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 21, 2019, 8 p.m. 10.0 ppb (9) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A 0.13 ppb (1) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 21, 2019, 7 p.m. 10.0 ppb (9) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A 0.26 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 21, 2019, 6 p.m. 15.0 ppb (14) 2.0 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A 0.31 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 21, 2019, 5 p.m. 10.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.14 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 21, 2019, 4 p.m. 11.0 ppb (10) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A 0.15 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 21, 2019, 3 p.m. 23.0 ppb (21) 6.0 ppb (6) N/A 17.0 ppb (16) N/A N/A N/A 0.24 ppb (3) N/A 13.0 μg/m3 (52) 52.0
 
Sept. 21, 2019, 2 p.m. 30.0 ppb (28) 10.0 ppb (9) N/A 20.0 ppb (19) N/A N/A N/A 0.32 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 21, 2019, 1 p.m. 27.0 ppb (25) 8.0 ppb (7) N/A 18.0 ppb (17) N/A N/A N/A 0.29 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 21, 2019, noon 37.0 ppb (34) 15.0 ppb (14) N/A 22.0 ppb (20) N/A N/A N/A 0.41 ppb (5) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 21, 2019, 11 a.m. 46.0 ppb (43) 21.0 ppb (19) N/A 25.0 ppb (23) N/A N/A N/A 0.47 ppb (5) N/A 13.0 μg/m3 (52) 52.0
 
Sept. 21, 2019, 10 a.m. 31.0 ppb (29) 11.0 ppb (10) N/A 20.0 ppb (19) N/A N/A N/A 0.3 ppb (3) N/A 4.0 μg/m3 (17) 29.0
 
Sept. 21, 2019, 9 a.m. 35.0 ppb (32) 11.0 ppb (10) N/A 24.0 ppb (22) N/A N/A N/A 0.26 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 21, 2019, 8 a.m. 24.0 ppb (22) 5.0 ppb (5) N/A 20.0 ppb (19) N/A N/A N/A 0.2 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 21, 2019, 7 a.m. 14.0 ppb (13) 1.0 ppb (1) N/A 13.0 ppb (12) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 21, 2019, 6 a.m. 14.0 ppb (13) 1.0 ppb (1) N/A 13.0 ppb (12) N/A N/A N/A 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 21, 2019, 5 a.m. 19.0 ppb (18) 3.0 ppb (3) N/A 16.0 ppb (15) N/A N/A N/A 0.35 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 21, 2019, 4 a.m. 19.0 ppb (18) 2.0 ppb (2) N/A 16.0 ppb (15) N/A N/A N/A 0.35 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 21, 2019, 3 a.m. 27.0 ppb (25) 6.0 ppb (6) N/A 22.0 ppb (20) N/A N/A N/A 0.5 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 21, 2019, 2 a.m. 30.0 ppb (28) 8.0 ppb (7) N/A 22.0 ppb (20) N/A N/A N/A 0.56 ppb (6) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 21, 2019, 1 a.m. 25.0 ppb (23) 5.0 ppb (5) N/A 20.0 ppb (19) N/A N/A N/A 0.47 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 21, 2019, midnight 29.0 ppb (27) 5.0 ppb (5) N/A 24.0 ppb (22) N/A N/A N/A 0.47 ppb (5) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 20, 2019, 11 p.m. 43.0 ppb (40) 9.0 ppb (8) N/A 34.0 ppb (31) N/A N/A N/A 0.63 ppb (7) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 20, 2019, 10 p.m. 28.0 ppb (26) 6.0 ppb (6) N/A 22.0 ppb (20) N/A N/A N/A 0.39 ppb (4) N/A 6.0 μg/m3 (25) 26.0
 
Sept. 20, 2019, 9 p.m. 14.0 ppb (13) 1.0 ppb (1) N/A 13.0 ppb (12) N/A N/A N/A 0.19 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 20, 2019, 8 p.m. 7.0 ppb (6) -1.0 ppb (0) N/A 7.0 ppb (6) N/A N/A N/A 0.11 ppb (1) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 20, 2019, 7 p.m. 15.0 ppb (14) 1.0 ppb (1) N/A 14.0 ppb (13) N/A N/A N/A 0.09 ppb (1) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 20, 2019, 6 p.m. 17.0 ppb (16) 3.0 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.13 ppb (1) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 20, 2019, 5 p.m. 23.0 ppb (21) 7.0 ppb (6) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 20, 2019, 4 p.m. 32.0 ppb (30) 15.0 ppb (14) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 20, 2019, 3 p.m. 30.0 ppb (28) 14.0 ppb (13) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A N/A 28.0
 
Sept. 20, 2019, 2 p.m. 47.0 ppb (44) 25.0 ppb (23) N/A 22.0 ppb (20) N/A N/A N/A 0.25 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 20, 2019, 1 p.m. 69.0 ppb (66) 42.0 ppb (39) N/A 27.0 ppb (25) N/A N/A N/A 0.34 ppb (4) N/A 9.0 μg/m3 (38) 66.0
 
Sept. 20, 2019, noon 67.0 ppb (64) 43.0 ppb (40) N/A 24.0 ppb (22) N/A N/A N/A 0.37 ppb (4) N/A 14.0 μg/m3 (54) 64.0
 
Sept. 20, 2019, 11 a.m. 82.0 ppb (80) 57.0 ppb (53) N/A 25.0 ppb (23) N/A N/A N/A 0.51 ppb (6) N/A 11.0 μg/m3 (46) 80.0
 
Sept. 20, 2019, 10 a.m. 93.0 ppb (91) 67.0 ppb (64) N/A 26.0 ppb (24) N/A N/A N/A 0.58 ppb (6) N/A 12.0 μg/m3 (50) 91.0
 
Sept. 20, 2019, 9 a.m. 50.0 ppb (46) 28.0 ppb (26) N/A 22.0 ppb (20) N/A N/A N/A 0.35 ppb (4) N/A 8.0 μg/m3 (33) 46.0
 
Sept. 20, 2019, 8 a.m. 38.0 ppb (35) 17.0 ppb (16) N/A 21.0 ppb (19) N/A N/A N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 35.0
 
Sept. 20, 2019, 7 a.m. 28.0 ppb (26) 10.0 ppb (9) N/A 18.0 ppb (17) N/A N/A N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 26.0
 
Sept. 20, 2019, 6 a.m. 18.0 ppb (17) 3.0 ppb (3) N/A 14.0 ppb (13) N/A N/A N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 20, 2019, 5 a.m. 14.0 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 20, 2019, 4 a.m. 16.0 ppb (15) 2.0 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A 0.18 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 20, 2019, 3 a.m. 39.0 ppb (36) 12.0 ppb (11) N/A 27.0 ppb (25) N/A N/A N/A 0.44 ppb (5) N/A 7.0 μg/m3 (29) 36.0
 
Sept. 20, 2019, 2 a.m. 38.0 ppb (35) 14.0 ppb (13) N/A 25.0 ppb (23) N/A N/A N/A 0.41 ppb (5) N/A 5.0 μg/m3 (21) 35.0
 
Sept. 20, 2019, 1 a.m. 36.0 ppb (33) 14.0 ppb (13) N/A 22.0 ppb (20) N/A N/A N/A 0.43 ppb (5) N/A 4.0 μg/m3 (17) 33.0
 
Sept. 20, 2019, midnight 22.0 ppb (20) 6.0 ppb (6) N/A 17.0 ppb (16) N/A N/A N/A 0.28 ppb (3) N/A 3.0 μg/m3 (12) 20.0
 
Sept. 19, 2019, 11 p.m. 10.0 ppb (9) 0.0 ppb (0) N/A 10.0 ppb (9) N/A N/A N/A 0.13 ppb (1) N/A 1.0 μg/m3 (4) 9.0
 
Sept. 19, 2019, 10 p.m. 7.0 ppb (6) 0.0 ppb (0) N/A 7.0 ppb (6) N/A N/A N/A 0.05 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 19, 2019, 9 p.m. 4.0 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.04 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 19, 2019, 8 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.04 ppb (0) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 19, 2019, 7 p.m. 2.0 ppb (2) -1.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.04 ppb (0) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 19, 2019, 6 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.04 ppb (0) N/A 13.0 μg/m3 (52) 52.0
 
Sept. 19, 2019, 5 p.m. 1.0 ppb (1) -1.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.02 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2019, 4 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.03 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2019, 3 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A 0.05 ppb (1) N/A N/A 6.0
 
Sept. 19, 2019, 2 p.m. 15.0 ppb (14) 6.0 ppb (6) N/A 9.0 ppb (8) N/A N/A N/A 0.07 ppb (1) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 19, 2019, 1 p.m. 46.0 ppb (43) 27.0 ppb (25) N/A 19.0 ppb (18) N/A N/A N/A 0.18 ppb (2) N/A 10.0 μg/m3 (42) 43.0
 
Sept. 19, 2019, noon 73.0 ppb (70) 49.0 ppb (45) N/A 24.0 ppb (22) N/A N/A N/A 0.39 ppb (4) N/A 10.0 μg/m3 (42) 70.0
 
Sept. 19, 2019, 11 a.m. 82.0 ppb (80) 56.0 ppb (52) N/A 26.0 ppb (24) N/A N/A N/A 0.48 ppb (5) N/A 11.0 μg/m3 (46) 80.0
 
Sept. 19, 2019, 10 a.m. 83.0 ppb (81) 56.0 ppb (52) N/A 27.0 ppb (25) N/A N/A N/A N/A N/A 15.0 μg/m3 (56) 81.0
 
Sept. 19, 2019, 9 a.m. 55.0 ppb (51) 30.0 ppb (28) N/A 25.0 ppb (23) N/A N/A N/A 0.4 ppb (4) N/A 10.0 μg/m3 (42) 51.0
 
Sept. 19, 2019, 8 a.m. 48.0 ppb (44) 24.0 ppb (22) N/A 25.0 ppb (23) N/A N/A N/A 0.21 ppb (2) N/A 8.0 μg/m3 (33) 44.0
 
Sept. 19, 2019, 7 a.m. 39.0 ppb (36) 16.0 ppb (15) N/A 24.0 ppb (22) N/A N/A N/A 0.2 ppb (2) N/A 7.0 μg/m3 (29) 36.0
 
Sept. 19, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A N/A 0.16 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A N/A 0.05 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 19, 2019, 4 a.m. 15.0 ppb (14) 0.0 ppb (0) N/A 15.0 ppb (14) N/A N/A N/A 0.09 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 19, 2019, 3 a.m. 18.0 ppb (17) 0.0 ppb (0) N/A 18.0 ppb (17) N/A N/A N/A 0.13 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 19, 2019, 2 a.m. 22.0 ppb (20) 5.0 ppb (5) N/A 18.0 ppb (17) N/A N/A N/A 0.1 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2019, 1 a.m. 15.0 ppb (14) 0.0 ppb (0) N/A 15.0 ppb (14) N/A N/A N/A 0.11 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 19, 2019, midnight 15.0 ppb (14) 1.0 ppb (1) N/A 14.0 ppb (13) N/A N/A N/A 0.07 ppb (1) N/A 3.0 μg/m3 (12) 14.0
 
Sept. 18, 2019, 11 p.m. 12.0 ppb (11) 0.0 ppb (0) N/A 12.0 ppb (11) N/A N/A N/A 0.06 ppb (1) N/A 2.0 μg/m3 (8) 11.0
 
Sept. 18, 2019, 10 p.m. 6.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.04 ppb (0) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 18, 2019, 9 p.m. 4.0 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.03 ppb (0) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 18, 2019, 8 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.04 ppb (0) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 18, 2019, 7 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.04 ppb (0) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2019, 6 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.03 ppb (0) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 18, 2019, 5 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.03 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2019, 4 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.04 ppb (0) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2019, 3 p.m. 4.0 ppb (4) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.04 ppb (0) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 18, 2019, 2 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.03 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2019, 1 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.05 ppb (1) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 18, 2019, noon 14.0 ppb (13) 5.0 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A 0.07 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2019, 11 a.m. 16.0 ppb (15) 6.0 ppb (6) N/A 11.0 ppb (10) N/A N/A N/A 0.09 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 18, 2019, 10 a.m. 10.0 ppb (9) 2.0 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.05 ppb (1) N/A 2.0 μg/m3 (8) 9.0
 
Sept. 18, 2019, 9 a.m. 6.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.05 ppb (1) N/A 1.0 μg/m3 (4) 6.0
 
Sept. 18, 2019, 8 a.m. 4.0 ppb (4) -1.0 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.02 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 18, 2019, 7 a.m. 2.0 ppb (2) -1.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.01 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 18, 2019, 6 a.m. 2.0 ppb (2) -1.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.01 ppb (0) N/A 2.0 μg/m3 (8) 8.0
 
Sept. 18, 2019, 5 a.m. 3.0 ppb (3) -1.0 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.02 ppb (0) N/A 1.0 μg/m3 (4) 4.0
 
Sept. 18, 2019, 4 a.m. 4.0 ppb (4) -1.0 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.03 ppb (0) N/A 1.0 μg/m3 (4) 5.0
 
Sept. 18, 2019, 3 a.m. 2.0 ppb (2) -1.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.01 ppb (0) N/A 1.0 μg/m3 (4) 4.0
 
Sept. 18, 2019, 2 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.02 ppb (0) N/A 1.0 μg/m3 (4) 4.0
 
Sept. 18, 2019, 1 a.m. 2.0 ppb (2) -1.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.02 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 18, 2019, midnight 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.04 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 17, 2019, 11 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.05 ppb (1) N/A 0.0 μg/m3 (0) 5.0
 
Sept. 17, 2019, 10 p.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.03 ppb (0) N/A 2.0 μg/m3 (8) 8.0
 
Sept. 17, 2019, 9 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.04 ppb (0) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 17, 2019, 8 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A 0.03 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 17, 2019, 7 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.02 ppb (0) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 17, 2019, 6 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.03 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 17, 2019, 5 p.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A 0.02 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 17, 2019, 4 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A 0.03 ppb (0) N/A 9.0 μg/m3 (38) 38.0
 
Sept. 17, 2019, 3 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.06 ppb (1) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 17, 2019, 2 p.m. 21.0 ppb (19) 11.0 ppb (10) N/A 11.0 ppb (10) N/A N/A N/A 0.08 ppb (1) N/A 11.0 μg/m3 (46) 46.0
 
Sept. 17, 2019, 1 p.m. 32.0 ppb (30) 17.0 ppb (16) N/A 15.0 ppb (14) N/A N/A N/A 0.13 ppb (1) N/A 10.0 μg/m3 (42) 42.0
 
Sept. 17, 2019, noon 43.0 ppb (40) 24.0 ppb (22) N/A 20.0 ppb (19) N/A N/A N/A 0.27 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Sept. 17, 2019, 11 a.m. 50.0 ppb (46) 28.0 ppb (26) N/A 23.0 ppb (21) N/A N/A N/A 0.35 ppb (4) N/A 8.0 μg/m3 (33) 46.0
 
Sept. 17, 2019, 10 a.m. 74.0 ppb (71) 45.0 ppb (42) N/A 29.0 ppb (27) N/A N/A N/A 0.33 ppb (4) N/A 6.0 μg/m3 (25) 71.0
 
Sept. 17, 2019, 9 a.m. 47.0 ppb (44) 23.0 ppb (21) N/A 24.0 ppb (22) N/A N/A N/A 0.3 ppb (3) N/A 4.0 μg/m3 (17) 44.0
 
Sept. 17, 2019, 8 a.m. 31.0 ppb (29) 12.0 ppb (11) N/A 20.0 ppb (19) N/A N/A N/A 0.17 ppb (2) N/A 4.0 μg/m3 (17) 29.0
 
Sept. 17, 2019, 7 a.m. 19.0 ppb (18) 4.0 ppb (4) N/A 15.0 ppb (14) N/A N/A N/A 0.1 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 17, 2019, 6 a.m. 25.0 ppb (23) 7.0 ppb (6) N/A 18.0 ppb (17) N/A N/A N/A 0.1 ppb (1) N/A 2.0 μg/m3 (8) 23.0
 
Sept. 17, 2019, 5 a.m. 15.0 ppb (14) 2.0 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A 0.08 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 17, 2019, 4 a.m. 16.0 ppb (15) 2.0 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A 0.12 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 17, 2019, 3 a.m. 24.0 ppb (22) 4.0 ppb (4) N/A 20.0 ppb (19) N/A N/A N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 22.0
 
Sept. 17, 2019, 2 a.m. 23.0 ppb (21) 5.0 ppb (5) N/A 19.0 ppb (18) N/A N/A N/A 0.12 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 17, 2019, 1 a.m. 11.0 ppb (10) -1.0 ppb (0) N/A 12.0 ppb (11) N/A N/A N/A 0.1 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 17, 2019, midnight 10.0 ppb (9) 0.0 ppb (0) N/A 10.0 ppb (9) N/A N/A N/A 0.11 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 16, 2019, 11 p.m. 15.0 ppb (14) 3.0 ppb (3) N/A 12.0 ppb (11) N/A N/A N/A 0.12 ppb (1) N/A 3.0 μg/m3 (12) 14.0
 
Sept. 16, 2019, 10 p.m. 15.0 ppb (14) 4.0 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A 0.16 ppb (2) N/A 2.0 μg/m3 (8) 14.0
 
Sept. 16, 2019, 9 p.m. 16.0 ppb (15) 5.0 ppb (5) N/A 11.0 ppb (10) N/A N/A N/A 0.13 ppb (1) N/A 1.0 μg/m3 (4) 15.0
 
Sept. 16, 2019, 8 p.m. 12.0 ppb (11) 4.0 ppb (4) N/A 9.0 ppb (8) N/A N/A N/A 0.17 ppb (2) N/A 2.0 μg/m3 (8) 11.0
 
Sept. 16, 2019, 7 p.m. 15.0 ppb (14) 5.0 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A 0.15 ppb (2) N/A 2.0 μg/m3 (8) 14.0
 
Sept. 16, 2019, 6 p.m. 15.0 ppb (14) 6.0 ppb (6) N/A 9.0 ppb (8) N/A N/A N/A 0.14 ppb (2) N/A 3.0 μg/m3 (12) 14.0
 
Sept. 16, 2019, 5 p.m. 18.0 ppb (17) 8.0 ppb (7) N/A 10.0 ppb (9) N/A N/A N/A 0.15 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 16, 2019, 4 p.m. 25.0 ppb (23) 12.0 ppb (11) N/A 13.0 ppb (12) N/A N/A N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 23.0
 
Sept. 16, 2019, 3 p.m. 19.0 ppb (18) 9.0 ppb (8) N/A 10.0 ppb (9) N/A N/A N/A 0.15 ppb (2) N/A N/A 18.0
 
Sept. 16, 2019, 2 p.m. 33.0 ppb (31) 18.0 ppb (17) N/A 15.0 ppb (14) N/A N/A N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 31.0
 
Sept. 16, 2019, 1 p.m. 34.0 ppb (31) 19.0 ppb (18) N/A 15.0 ppb (14) N/A N/A N/A 0.16 ppb (2) N/A 4.0 μg/m3 (17) 31.0
 
Sept. 16, 2019, noon 29.0 ppb (27) 13.0 ppb (12) N/A 15.0 ppb (14) N/A N/A N/A 0.16 ppb (2) N/A 6.0 μg/m3 (25) 27.0
 
Sept. 16, 2019, 11 a.m. 32.0 ppb (30) 14.0 ppb (13) N/A 17.0 ppb (16) N/A N/A N/A 0.2 ppb (2) N/A 4.0 μg/m3 (17) 30.0
 
Sept. 16, 2019, 10 a.m. 30.0 ppb (28) 11.0 ppb (10) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 28.0
 
Sept. 16, 2019, 9 a.m. 22.0 ppb (20) 5.0 ppb (5) N/A 17.0 ppb (16) N/A N/A N/A 0.13 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 16, 2019, 8 a.m. 28.0 ppb (26) 8.0 ppb (7) N/A 19.0 ppb (18) N/A N/A N/A 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 16, 2019, 7 a.m. 23.0 ppb (21) 6.0 ppb (6) N/A 17.0 ppb (16) N/A N/A N/A 0.17 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 16, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 16, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 16, 2019, 4 a.m. 13.0 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 16, 2019, 3 a.m. 14.0 ppb (13) 1.0 ppb (1) N/A 13.0 ppb (12) N/A N/A N/A 0.24 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 16, 2019, 2 a.m. 18.0 ppb (17) 4.0 ppb (4) N/A 15.0 ppb (14) N/A N/A N/A 0.3 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 16, 2019, 1 a.m. 16.0 ppb (15) 2.0 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A 0.28 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Sept. 16, 2019, midnight 17.0 ppb (16) 3.0 ppb (3) N/A 14.0 ppb (13) N/A N/A N/A 0.3 ppb (3) N/A 2.0 μg/m3 (8) 16.0
 
Sept. 15, 2019, 11 p.m. 13.0 ppb (12) 2.0 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 15, 2019, 10 p.m. 14.0 ppb (13) 3.0 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Sept. 15, 2019, 9 p.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A N/A N/A 0.15 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 15, 2019, 8 p.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.12 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 15, 2019, 7 p.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.12 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 15, 2019, 6 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.13 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 15, 2019, 5 p.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.13 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Sept. 15, 2019, 4 p.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.11 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 15, 2019, 3 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.12 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 15, 2019, 2 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.14 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Sept. 15, 2019, 1 p.m. 12.0 ppb (11) 4.0 ppb (4) N/A 8.0 ppb (7) N/A N/A N/A 0.15 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Sept. 15, 2019, noon 10.0 ppb (9) 3.0 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A 0.16 ppb (2) N/A 2.0 μg/m3 (8) 9.0
 
Sept. 15, 2019, 11 a.m. 12.0 ppb (11) 4.0 ppb (4) N/A 8.0 ppb (7) N/A N/A N/A 0.26 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 15, 2019, 10 a.m. 11.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.22 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
Sept. 15, 2019, 9 a.m. 9.0 ppb (8) 2.0 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.15 ppb (2) N/A 1.0 μg/m3 (4) 8.0
 
Sept. 15, 2019, 8 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.15 ppb (2) N/A 2.0 μg/m3 (8) 8.0