AQSQID: 250250044

Site Name: Boston-Von Hillern

Location: Boston, MA

Reporting: True, Located: True

Current AQI: 46.0

Boston MA, US: 42.325197, -71.056056

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 21, 2019, 9 a.m. 50.0 ppb (46) 15.0 ppb (14) N/A 35.0 ppb (32) N/A N/A N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 46.0
 
March 21, 2019, 8 a.m. 36.0 ppb (33) 9.0 ppb (8) N/A 27.0 ppb (25) N/A N/A N/A 0.15 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
March 21, 2019, 7 a.m. 22.0 ppb (20) 2.0 ppb (2) N/A 20.0 ppb (19) N/A N/A N/A 0.05 ppb (1) N/A 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 6 a.m. 18.0 ppb (17) 1.0 ppb (1) N/A 17.0 ppb (16) N/A N/A N/A 0.07 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 5 a.m. 17.0 ppb (16) 1.0 ppb (1) N/A 16.0 ppb (15) N/A N/A N/A 0.07 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 4 a.m. 22.0 ppb (20) 2.0 ppb (2) N/A 20.0 ppb (19) N/A N/A N/A 0.15 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 3 a.m. 21.0 ppb (19) 2.0 ppb (2) N/A 19.0 ppb (18) N/A N/A N/A 0.21 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 21, 2019, 2 a.m. 18.0 ppb (17) 2.0 ppb (2) N/A 16.0 ppb (15) N/A N/A N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 21, 2019, 1 a.m. 15.0 ppb (14) 1.0 ppb (1) N/A 14.0 ppb (13) N/A N/A N/A 0.14 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 21, 2019, midnight 15.0 ppb (14) 2.0 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A 0.13 ppb (1) N/A 3.0 μg/m3 (12) 14.0
 
March 20, 2019, 11 p.m. 15.0 ppb (14) 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
 
March 20, 2019, 10 p.m. 15.0 ppb (14) 2.0 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A 0.09 ppb (1) N/A 9.0 μg/m3 (38) 38.0
 
March 20, 2019, 9 p.m. 12.0 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.08 ppb (1) N/A 11.0 μg/m3 (46) 46.0
 
March 20, 2019, 8 p.m. 11.0 ppb (10) 2.0 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.07 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 20, 2019, 7 p.m. 6.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.02 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
March 20, 2019, 6 p.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.0 ppb (0) N/A 9.0 μg/m3 (38) 38.0
 
March 20, 2019, 5 p.m. 6.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.0 ppb (0) N/A 16.0 μg/m3 (59) 59.0
 
March 20, 2019, 4 p.m. 13.0 ppb (12) 3.0 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.04 ppb (0) N/A N/A 12.0
 
March 20, 2019, 3 p.m. 17.0 ppb (16) 5.0 ppb (5) N/A 12.0 ppb (11) N/A N/A N/A 0.06 ppb (1) N/A 13.0 μg/m3 (52) 52.0
 
March 20, 2019, 2 p.m. 40.0 ppb (37) 18.0 ppb (17) N/A 22.0 ppb (20) N/A N/A N/A 0.15 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 20, 2019, 1 p.m. 67.0 ppb (64) 34.0 ppb (31) N/A 33.0 ppb (31) N/A N/A N/A 0.29 ppb (3) N/A 12.0 μg/m3 (50) 64.0
 
March 20, 2019, noon 98.0 ppb (97) 56.0 ppb (52) N/A 42.0 ppb (39) N/A N/A N/A 0.44 ppb (5) N/A 11.0 μg/m3 (46) 97.0
 
March 20, 2019, 11 a.m. 124.0 ppb (104) 75.0 ppb (72) N/A 49.0 ppb (45) N/A N/A N/A 0.68 ppb (8) N/A 17.0 μg/m3 (61) 104.0
 
March 20, 2019, 10 a.m. 156.0 ppb (111) 103.0 ppb (100) N/A 53.0 ppb (49) N/A N/A N/A N/A N/A 17.0 μg/m3 (61) 111.0
 
March 20, 2019, 9 a.m. 106.0 ppb (101) 57.0 ppb (53) N/A 49.0 ppb (45) N/A N/A N/A 0.67 ppb (7) N/A 12.0 μg/m3 (50) 101.0
 
March 20, 2019, 8 a.m. 73.0 ppb (70) 27.0 ppb (25) N/A 47.0 ppb (44) N/A N/A N/A 0.35 ppb (4) N/A 9.0 μg/m3 (38) 70.0
 
March 20, 2019, 7 a.m. 50.0 ppb (46) 11.0 ppb (10) N/A 40.0 ppb (37) N/A N/A N/A 0.2 ppb (2) N/A 7.0 μg/m3 (29) 46.0
 
March 20, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 20, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A N/A 0.47 ppb (5) N/A 13.0 μg/m3 (52) 52.0
 
March 20, 2019, 4 a.m. 85.0 ppb (83) 34.0 ppb (31) N/A 51.0 ppb (47) N/A N/A N/A 0.48 ppb (5) N/A 10.0 μg/m3 (42) 83.0
 
March 20, 2019, 3 a.m. 61.0 ppb (57) 16.0 ppb (15) N/A 45.0 ppb (42) N/A N/A N/A 0.37 ppb (4) N/A 8.0 μg/m3 (33) 57.0
 
March 20, 2019, 2 a.m. 31.0 ppb (29) 4.0 ppb (4) N/A 27.0 ppb (25) N/A N/A N/A 0.21 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 20, 2019, 1 a.m. 25.0 ppb (23) 3.0 ppb (3) N/A 22.0 ppb (20) N/A N/A N/A 0.21 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 20, 2019, midnight 22.0 ppb (20) 2.0 ppb (2) N/A 20.0 ppb (19) N/A N/A N/A 0.17 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 11 p.m. 22.0 ppb (20) 4.0 ppb (4) N/A 18.0 ppb (17) N/A N/A N/A 0.22 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 19, 2019, 10 p.m. 18.0 ppb (17) 4.0 ppb (4) N/A 14.0 ppb (13) N/A N/A N/A 0.14 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 19, 2019, 9 p.m. 15.0 ppb (14) 4.0 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.12 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 19, 2019, 8 p.m. 15.0 ppb (14) 4.0 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.1 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 19, 2019, 7 p.m. 18.0 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (11) N/A N/A N/A 0.12 ppb (1) N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 6 p.m. 19.0 ppb (18) 7.0 ppb (6) N/A 12.0 ppb (11) N/A N/A N/A 0.12 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 19, 2019, 5 p.m. 21.0 ppb (19) 8.0 ppb (7) N/A 13.0 ppb (12) N/A N/A N/A 0.1 ppb (1) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 4 p.m. 23.0 ppb (21) 9.0 ppb (8) N/A 14.0 ppb (13) N/A N/A N/A 0.1 ppb (1) N/A 13.0 μg/m3 (52) 52.0
 
March 19, 2019, 3 p.m. 33.0 ppb (31) 15.0 ppb (14) N/A 18.0 ppb (17) N/A N/A N/A 0.11 ppb (1) N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 2 p.m. 36.0 ppb (33) 17.0 ppb (16) N/A 19.0 ppb (18) N/A N/A N/A 0.11 ppb (1) N/A 12.0 μg/m3 (50) 50.0
 
March 19, 2019, 1 p.m. 47.0 ppb (44) 24.0 ppb (22) N/A 24.0 ppb (22) N/A N/A N/A 0.16 ppb (2) N/A 18.0 μg/m3 (63) 63.0
 
March 19, 2019, noon 71.0 ppb (68) 36.0 ppb (33) N/A 34.0 ppb (31) N/A N/A N/A 0.28 ppb (3) N/A 11.0 μg/m3 (46) 68.0
 
March 19, 2019, 11 a.m. 84.0 ppb (82) 43.0 ppb (40) N/A 41.0 ppb (38) N/A N/A N/A 0.43 ppb (5) N/A 16.0 μg/m3 (59) 82.0
 
March 19, 2019, 10 a.m. 99.0 ppb (98) 53.0 ppb (49) N/A 45.0 ppb (42) N/A N/A N/A 0.47 ppb (5) N/A 12.0 μg/m3 (50) 98.0
 
March 19, 2019, 9 a.m. 57.0 ppb (53) 21.0 ppb (19) N/A 36.0 ppb (33) N/A N/A N/A 0.24 ppb (3) N/A 16.0 μg/m3 (59) 59.0
 
March 19, 2019, 8 a.m. 47.0 ppb (44) 14.0 ppb (13) N/A 33.0 ppb (31) N/A N/A N/A 0.18 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
March 19, 2019, 7 a.m. 47.0 ppb (44) 10.0 ppb (9) N/A 36.0 ppb (33) N/A N/A N/A 0.19 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
March 19, 2019, 6 a.m. 47.0 ppb (44) 8.0 ppb (7) N/A 38.0 ppb (35) N/A N/A N/A 0.22 ppb (2) N/A 16.0 μg/m3 (59) 59.0
 
March 19, 2019, 5 a.m. 53.0 ppb (49) 10.0 ppb (9) N/A 43.0 ppb (40) N/A N/A N/A 0.3 ppb (3) N/A 10.0 μg/m3 (42) 49.0
 
March 19, 2019, 4 a.m. 58.0 ppb (54) 13.0 ppb (12) N/A 45.0 ppb (42) N/A N/A N/A 0.43 ppb (5) N/A 11.0 μg/m3 (46) 54.0
 
March 19, 2019, 3 a.m. 56.0 ppb (52) 15.0 ppb (14) N/A 41.0 ppb (38) N/A N/A N/A 0.47 ppb (5) N/A 9.0 μg/m3 (38) 52.0
 
March 19, 2019, 2 a.m. 39.0 ppb (36) 8.0 ppb (7) N/A 31.0 ppb (29) N/A N/A N/A 0.39 ppb (4) N/A 7.0 μg/m3 (29) 36.0
 
March 19, 2019, 1 a.m. 29.0 ppb (27) 6.0 ppb (6) N/A 23.0 ppb (21) N/A N/A N/A 0.28 ppb (3) N/A 6.0 μg/m3 (25) 27.0
 
March 19, 2019, midnight 23.0 ppb (21) 4.0 ppb (4) N/A 19.0 ppb (18) N/A N/A N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 11 p.m. 17.0 ppb (16) 3.0 ppb (3) N/A 14.0 ppb (13) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 18, 2019, 10 p.m. 19.0 ppb (18) 5.0 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A 0.15 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 9 p.m. 15.0 ppb (14) 4.0 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.12 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 18, 2019, 8 p.m. 17.0 ppb (16) 6.0 ppb (6) N/A 11.0 ppb (10) N/A N/A N/A 0.13 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 18, 2019, 7 p.m. 20.0 ppb (19) 8.0 ppb (7) N/A 12.0 ppb (11) N/A N/A N/A 0.13 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, 6 p.m. 20.0 ppb (19) 8.0 ppb (7) N/A 12.0 ppb (11) N/A N/A N/A 0.11 ppb (1) N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 5 p.m. 24.0 ppb (22) 10.0 ppb (9) N/A 14.0 ppb (13) N/A N/A N/A 0.13 ppb (1) N/A 5.0 μg/m3 (21) 22.0
 
March 18, 2019, 4 p.m. 23.0 ppb (21) 9.0 ppb (8) N/A 14.0 ppb (13) N/A N/A N/A 0.11 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, 3 p.m. 29.0 ppb (27) 13.0 ppb (12) N/A 17.0 ppb (16) N/A N/A N/A 0.14 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 18, 2019, 2 p.m. 41.0 ppb (38) 20.0 ppb (19) N/A 21.0 ppb (19) N/A N/A N/A 0.13 ppb (1) N/A 6.0 μg/m3 (25) 38.0
 
March 18, 2019, 1 p.m. 42.0 ppb (39) 21.0 ppb (19) N/A 21.0 ppb (19) N/A N/A N/A 0.17 ppb (2) N/A 8.0 μg/m3 (33) 39.0
 
March 18, 2019, noon 61.0 ppb (57) 31.0 ppb (29) N/A 30.0 ppb (28) N/A N/A N/A 0.26 ppb (3) N/A 13.0 μg/m3 (52) 57.0
 
March 18, 2019, 11 a.m. 86.0 ppb (84) 45.0 ppb (42) N/A 41.0 ppb (38) N/A N/A N/A 0.43 ppb (5) N/A 11.0 μg/m3 (46) 84.0
 
March 18, 2019, 10 a.m. 103.0 ppb (100) 59.0 ppb (55) N/A 44.0 ppb (41) N/A N/A N/A 0.4 ppb (4) N/A 10.0 μg/m3 (42) 100.0
 
March 18, 2019, 9 a.m. 54.0 ppb (50) 22.0 ppb (20) N/A 32.0 ppb (30) N/A N/A N/A 0.23 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
March 18, 2019, 8 a.m. 30.0 ppb (28) 8.0 ppb (7) N/A 23.0 ppb (21) N/A N/A N/A 0.13 ppb (1) N/A 11.0 μg/m3 (46) 46.0
 
March 18, 2019, 7 a.m. 36.0 ppb (33) 9.0 ppb (8) N/A 26.0 ppb (24) N/A N/A N/A 0.12 ppb (1) N/A 9.0 μg/m3 (38) 38.0
 
March 18, 2019, 6 a.m. 14.0 ppb (13) 1.0 ppb (1) N/A 13.0 ppb (12) N/A N/A N/A 0.1 ppb (1) N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 5 a.m. 11.0 ppb (10) 0.0 ppb (0) N/A 11.0 ppb (10) N/A N/A N/A 0.07 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
March 18, 2019, 4 a.m. 11.0 ppb (10) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A 0.07 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
March 18, 2019, 3 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.1 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
March 18, 2019, 2 a.m. 13.0 ppb (12) 2.0 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.13 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, 1 a.m. 16.0 ppb (15) 3.0 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.17 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 18, 2019, midnight 16.0 ppb (15) 3.0 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.17 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 11 p.m. 14.0 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.16 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 17, 2019, 10 p.m. 17.0 ppb (16) 4.0 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A 0.16 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 9 p.m. 11.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A N/A N/A 0.12 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 8 p.m. 12.0 ppb (11) 4.0 ppb (4) N/A 8.0 ppb (7) N/A N/A N/A 0.11 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
March 17, 2019, 7 p.m. 10.0 ppb (9) 3.0 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A 0.11 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
March 17, 2019, 6 p.m. 10.0 ppb (9) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.1 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 5 p.m. 10.0 ppb (9) 4.0 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A 0.11 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 4 p.m. 10.0 ppb (9) 4.0 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A 0.09 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
March 17, 2019, 3 p.m. 11.0 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A 0.12 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
March 17, 2019, 2 p.m. 11.0 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A 0.12 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
March 17, 2019, 1 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.12 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, noon 9.0 ppb (8) 1.0 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.12 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 11 a.m. 11.0 ppb (10) 2.0 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.16 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 17, 2019, 10 a.m. 9.0 ppb (8) 1.0 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 17, 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 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 8 a.m. 6.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A 0.06 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
March 17, 2019, 7 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A 0.06 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 6 a.m. N/A N/A N/A N/A N/A N/A N/A 0.12 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 17, 2019, 5 a.m. N/A N/A N/A N/A N/A N/A N/A 0.1 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 17, 2019, 4 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.11 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 17, 2019, 3 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.13 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
March 17, 2019, 2 a.m. 11.0 ppb (10) 2.0 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.15 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 17, 2019, 1 a.m. 11.0 ppb (10) 2.0 ppb (2) N/A 10.0 ppb (9) N/A N/A N/A 0.16 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 17, 2019, midnight 10.0 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.12 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 16, 2019, 11 p.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.13 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
March 16, 2019, 10 p.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.13 ppb (1) N/A 2.0 μg/m3 (8) 9.0
 
March 16, 2019, 9 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A 0.11 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
March 16, 2019, 8 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.1 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 16, 2019, 7 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.1 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 16, 2019, 6 p.m. 10.0 ppb (9) 4.0 ppb (4) 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
 
March 16, 2019, 5 p.m. 10.0 ppb (9) 4.0 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A 0.1 ppb (1) N/A 8.0 μg/m3 (33) 33.0
 
March 16, 2019, 4 p.m. 13.0 ppb (12) 5.0 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A 0.11 ppb (1) N/A 4.0 μg/m3 (17) 17.0
 
March 16, 2019, 3 p.m. 12.0 ppb (11) 5.0 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A 0.16 ppb (2) N/A 1.0 μg/m3 (4) 11.0
 
March 16, 2019, 2 p.m. 13.0 ppb (12) 5.0 ppb (5) N/A 8.0 ppb (7) N/A N/A N/A 0.12 ppb (1) N/A 2.0 μg/m3 (8) 12.0
 
March 16, 2019, 1 p.m. 15.0 ppb (14) 6.0 ppb (6) N/A 9.0 ppb (8) N/A N/A N/A 0.16 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 16, 2019, noon 16.0 ppb (15) 6.0 ppb (6) N/A 11.0 ppb (10) N/A N/A N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 16, 2019, 11 a.m. 18.0 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (11) N/A N/A N/A 0.16 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 16, 2019, 10 a.m. 12.0 ppb (11) 3.0 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.11 ppb (1) N/A 2.0 μg/m3 (8) 11.0
 
March 16, 2019, 9 a.m. 9.0 ppb (8) 2.0 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.09 ppb (1) N/A 2.0 μg/m3 (8) 8.0
 
March 16, 2019, 8 a.m. 9.0 ppb (8) 1.0 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.04 ppb (0) N/A 0.0 μg/m3 (0) 8.0
 
March 16, 2019, 7 a.m. 7.0 ppb (6) 0.0 ppb (0) N/A 7.0 ppb (6) N/A N/A N/A 0.03 ppb (0) N/A 1.0 μg/m3 (4) 6.0
 
March 16, 2019, 6 a.m. 7.0 ppb (6) 0.0 ppb (0) N/A 7.0 ppb (6) N/A N/A N/A 0.06 ppb (1) N/A -2.0 μg/m3 (0) 6.0
 
March 16, 2019, 5 a.m. 7.0 ppb (6) 0.0 ppb (0) N/A 7.0 ppb (6) N/A N/A N/A 0.06 ppb (1) N/A -1.0 μg/m3 (0) 6.0
 
March 16, 2019, 4 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A 0.09 ppb (1) N/A 3.0 μg/m3 (12) 12.0
 
March 16, 2019, 3 a.m. 12.0 ppb (11) 1.0 ppb (1) N/A 11.0 ppb (10) N/A N/A N/A 0.11 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 16, 2019, 2 a.m. 12.0 ppb (11) 2.0 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.11 ppb (1) N/A 10.0 μg/m3 (42) 42.0
 
March 16, 2019, 1 a.m. 13.0 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (11) N/A N/A N/A 0.14 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 16, 2019, midnight 16.0 ppb (15) 3.0 ppb (3) N/A 13.0 ppb (12) N/A N/A N/A 0.14 ppb (2) N/A 2.0 μg/m3 (8) 15.0
 
March 15, 2019, 11 p.m. 15.0 ppb (14) 2.0 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A 0.12 ppb (1) N/A 2.0 μg/m3 (8) 14.0
 
March 15, 2019, 10 p.m. 14.0 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.13 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 15, 2019, 9 p.m. 14.0 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.12 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 15, 2019, 8 p.m. 14.0 ppb (13) 3.0 ppb (3) N/A 11.0 ppb (10) N/A N/A N/A 0.09 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 15, 2019, 7 p.m. 18.0 ppb (17) 5.0 ppb (5) N/A 14.0 ppb (13) N/A N/A N/A 0.11 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 15, 2019, 6 p.m. 19.0 ppb (18) 6.0 ppb (6) N/A 13.0 ppb (12) N/A N/A N/A 0.1 ppb (1) N/A 10.0 μg/m3 (42) 42.0
 
March 15, 2019, 5 p.m. 17.0 ppb (16) 5.0 ppb (5) N/A 12.0 ppb (11) N/A N/A N/A 0.06 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 15, 2019, 4 p.m. 22.0 ppb (20) 7.0 ppb (6) N/A 15.0 ppb (14) N/A N/A N/A 0.08 ppb (1) N/A 4.0 μg/m3 (17) 20.0
 
March 15, 2019, 3 p.m. 27.0 ppb (25) 10.0 ppb (9) N/A 18.0 ppb (17) N/A N/A N/A 0.07 ppb (1) N/A 3.0 μg/m3 (12) 25.0
 
March 15, 2019, 2 p.m. 25.0 ppb (23) 8.0 ppb (7) N/A 16.0 ppb (15) N/A N/A N/A 0.05 ppb (1) N/A 8.0 μg/m3 (33) 33.0
 
March 15, 2019, 1 p.m. 31.0 ppb (29) 11.0 ppb (10) N/A 20.0 ppb (19) N/A N/A N/A 0.08 ppb (1) N/A 11.0 μg/m3 (46) 46.0
 
March 15, 2019, noon 25.0 ppb (23) 8.0 ppb (7) N/A 17.0 ppb (16) N/A N/A N/A 0.06 ppb (1) N/A 4.0 μg/m3 (17) 23.0
 
March 15, 2019, 11 a.m. 26.0 ppb (24) 9.0 ppb (8) N/A 18.0 ppb (17) N/A N/A N/A 0.08 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 15, 2019, 10 a.m. 25.0 ppb (23) 7.0 ppb (6) N/A 18.0 ppb (17) N/A N/A N/A 0.08 ppb (1) N/A 4.0 μg/m3 (17) 23.0
 
March 15, 2019, 9 a.m. 22.0 ppb (20) 4.0 ppb (4) N/A 18.0 ppb (17) N/A N/A N/A 0.08 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 15, 2019, 8 a.m. 36.0 ppb (33) 9.0 ppb (8) N/A 27.0 ppb (25) N/A N/A N/A 0.17 ppb (2) N/A 6.0 μg/m3 (25) 33.0
 
March 15, 2019, 7 a.m. 23.0 ppb (21) 3.0 ppb (3) N/A 21.0 ppb (19) N/A N/A N/A 0.07 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
March 15, 2019, 6 a.m. 9.0 ppb (8) -1.0 ppb (0) N/A 10.0 ppb (9) N/A N/A N/A 0.01 ppb (0) N/A 2.0 μg/m3 (8) 9.0
 
March 15, 2019, 5 a.m. 12.0 ppb (11) -1.0 ppb (0) N/A 13.0 ppb (12) N/A N/A N/A 0.02 ppb (0) N/A 3.0 μg/m3 (12) 12.0
 
March 15, 2019, 4 a.m. 13.0 ppb (12) 0.0 ppb (0) N/A 13.0 ppb (12) N/A N/A N/A 0.12 ppb (1) N/A N/A 12.0
 
March 15, 2019, 3 a.m. 22.0 ppb (20) 1.0 ppb (1) N/A 20.0 ppb (19) N/A N/A N/A 0.26 ppb (3) N/A N/A 20.0
 
March 15, 2019, 2 a.m. 19.0 ppb (18) 1.0 ppb (1) N/A 18.0 ppb (17) N/A N/A N/A 0.15 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 15, 2019, 1 a.m. 25.0 ppb (23) 3.0 ppb (3) N/A 22.0 ppb (20) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 15, 2019, midnight 23.0 ppb (21) 3.0 ppb (3) N/A 20.0 ppb (19) N/A N/A N/A 0.23 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
March 14, 2019, 11 p.m. 23.0 ppb (21) 3.0 ppb (3) N/A 20.0 ppb (19) N/A N/A N/A 0.25 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 14, 2019, 10 p.m. 22.0 ppb (20) 3.0 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A 0.18 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 14, 2019, 9 p.m. 18.0 ppb (17) 3.0 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.11 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
March 14, 2019, 8 p.m. 23.0 ppb (21) 5.0 ppb (5) N/A 18.0 ppb (17) N/A N/A N/A 0.13 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 14, 2019, 7 p.m. 24.0 ppb (22) 6.0 ppb (6) N/A 17.0 ppb (16) N/A N/A N/A 0.12 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
March 14, 2019, 6 p.m. 12.0 ppb (11) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 14, 2019, 5 p.m. 8.0 ppb (7) 0.0 ppb (0) N/A 8.0 ppb (7) N/A N/A N/A 0.0 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
March 14, 2019, 4 p.m. 17.0 ppb (16) 4.0 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.02 ppb (0) N/A 9.0 μg/m3 (38) 38.0
 
March 14, 2019, 3 p.m. 32.0 ppb (30) 11.0 ppb (10) N/A 20.0 ppb (19) N/A N/A N/A 0.13 ppb (1) N/A 11.0 μg/m3 (46) 46.0
 
March 14, 2019, 2 p.m. 56.0 ppb (52) 26.0 ppb (24) N/A 31.0 ppb (29) N/A N/A N/A 0.22 ppb (2) N/A 18.0 μg/m3 (63) 63.0
 
March 14, 2019, 1 p.m. 63.0 ppb (60) 29.0 ppb (27) N/A 34.0 ppb (31) N/A N/A N/A 0.22 ppb (2) N/A 16.0 μg/m3 (59) 60.0
 
March 14, 2019, noon 70.0 ppb (67) 30.0 ppb (28) N/A 40.0 ppb (37) N/A N/A N/A 0.33 ppb (4) N/A 12.0 μg/m3 (50) 67.0
 
March 14, 2019, 11 a.m. 86.0 ppb (84) 40.0 ppb (37) N/A 46.0 ppb (43) N/A N/A N/A 0.43 ppb (5) N/A 15.0 μg/m3 (56) 84.0
 
March 14, 2019, 10 a.m. 69.0 ppb (66) 28.0 ppb (26) N/A 41.0 ppb (38) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 66.0