AQSQID: 250250044

Site Name: Boston-Von Hillern

Location: Boston (S Boston), MA

Reporting: True, Located: True

Current AQI: 21.0

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, 2020, 6 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.05 ppb (1) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 25, 2020, 5 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.07 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 25, 2020, 4 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.07 ppb (1) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 25, 2020, 3 a.m. 25.0 ppb (23) 3.0 ppb (3) N/A 22.0 ppb (20) N/A N/A N/A 0.16 ppb (2) N/A 16.0 μg/m3 (59) 59.0
 
Jan. 25, 2020, 2 a.m. 35.0 ppb (32) 4.0 ppb (4) N/A 31.0 ppb (29) N/A N/A N/A 0.28 ppb (3) N/A 21.0 μg/m3 (69) 69.0
 
Jan. 25, 2020, 1 a.m. 46.0 ppb (43) 7.0 ppb (6) N/A 39.0 ppb (36) N/A N/A N/A 0.33 ppb (4) N/A 19.0 μg/m3 (65) 65.0
 
Jan. 25, 2020, midnight 36.0 ppb (33) 4.0 ppb (4) N/A 32.0 ppb (30) N/A N/A N/A 0.28 ppb (3) N/A 19.0 μg/m3 (65) 65.0
 
Jan. 24, 2020, 11 p.m. 26.0 ppb (24) 3.0 ppb (3) N/A 23.0 ppb (21) N/A N/A N/A 0.2 ppb (2) N/A 13.0 μg/m3 (52) 52.0
 
Jan. 24, 2020, 10 p.m. 29.0 ppb (27) 4.0 ppb (4) N/A 25.0 ppb (23) N/A N/A N/A 0.22 ppb (2) N/A N/A 27.0
 
Jan. 24, 2020, 9 p.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 N/A 23.0
 
Jan. 24, 2020, 8 p.m. 14.0 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A N/A N/A 0.17 ppb (2) N/A N/A 13.0
 
Jan. 24, 2020, 7 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 9.0 μg/m3 (38) 38.0
 
Jan. 24, 2020, 6 p.m. 16.0 ppb (15) 4.0 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.15 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 24, 2020, 5 p.m. 17.0 ppb (16) 4.0 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.13 ppb (1) N/A 20.0 μg/m3 (67) 67.0
 
Jan. 24, 2020, 4 p.m. 24.0 ppb (22) 8.0 ppb (7) N/A 16.0 ppb (15) N/A N/A N/A 0.17 ppb (2) N/A 18.0 μg/m3 (63) 63.0
 
Jan. 24, 2020, 3 p.m. 41.0 ppb (38) 17.0 ppb (16) N/A 23.0 ppb (21) N/A N/A N/A 0.27 ppb (3) N/A 17.0 μg/m3 (61) 61.0
 
Jan. 24, 2020, 2 p.m. 95.0 ppb (94) 59.0 ppb (55) N/A 36.0 ppb (33) N/A N/A N/A 0.46 ppb (5) N/A 21.0 μg/m3 (69) 94.0
 
Jan. 24, 2020, 1 p.m. 135.0 ppb (107) 92.0 ppb (90) N/A 43.0 ppb (40) N/A N/A N/A 0.64 ppb (7) N/A 24.0 μg/m3 (76) 107.0
 
Jan. 24, 2020, noon 156.0 ppb (111) 109.0 ppb (102) N/A 47.0 ppb (44) N/A N/A N/A 0.79 ppb (9) N/A 22.0 μg/m3 (71) 111.0
 
Jan. 24, 2020, 11 a.m. 70.0 ppb (67) 29.0 ppb (27) N/A 41.0 ppb (38) N/A N/A N/A 0.42 ppb (5) N/A 16.0 μg/m3 (59) 67.0
 
Jan. 24, 2020, 10 a.m. 72.0 ppb (69) 30.0 ppb (28) N/A 42.0 ppb (39) N/A N/A N/A 0.37 ppb (4) N/A 14.0 μg/m3 (54) 69.0
 
Jan. 24, 2020, 9 a.m. 121.0 ppb (104) 75.0 ppb (72) N/A 45.0 ppb (42) N/A N/A N/A 0.62 ppb (7) N/A 18.0 μg/m3 (63) 104.0
 
Jan. 24, 2020, 8 a.m. 114.0 ppb (102) 69.0 ppb (66) N/A 44.0 ppb (41) N/A N/A N/A 0.61 ppb (7) N/A 16.0 μg/m3 (59) 102.0
 
Jan. 24, 2020, 7 a.m. 108.0 ppb (101) 65.0 ppb (62) N/A 44.0 ppb (41) N/A N/A N/A 0.83 ppb (9) N/A 19.0 μg/m3 (65) 101.0
 
Jan. 24, 2020, 6 a.m. 88.0 ppb (86) 45.0 ppb (42) N/A 42.0 ppb (39) N/A N/A N/A 0.71 ppb (8) N/A 17.0 μg/m3 (61) 86.0
 
Jan. 24, 2020, 5 a.m. 80.0 ppb (78) 37.0 ppb (34) N/A 42.0 ppb (39) N/A N/A N/A 0.73 ppb (8) N/A 14.0 μg/m3 (54) 78.0
 
Jan. 24, 2020, 4 a.m. 81.0 ppb (79) 39.0 ppb (36) N/A 42.0 ppb (39) N/A N/A N/A 0.79 ppb (9) N/A 17.0 μg/m3 (61) 79.0
 
Jan. 24, 2020, 3 a.m. 74.0 ppb (71) 32.0 ppb (30) N/A 42.0 ppb (39) N/A N/A N/A 0.63 ppb (7) N/A 17.0 μg/m3 (61) 71.0
 
Jan. 24, 2020, 2 a.m. 75.0 ppb (72) 32.0 ppb (30) N/A 43.0 ppb (40) N/A N/A N/A 0.69 ppb (8) N/A 22.0 μg/m3 (71) 72.0
 
Jan. 24, 2020, 1 a.m. 67.0 ppb (64) 26.0 ppb (24) N/A 41.0 ppb (38) N/A N/A N/A 0.67 ppb (7) N/A 18.0 μg/m3 (63) 64.0
 
Jan. 24, 2020, midnight 53.0 ppb (49) 15.0 ppb (14) N/A 38.0 ppb (35) N/A N/A N/A 0.5 ppb (6) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 23, 2020, 11 p.m. 66.0 ppb (63) 23.0 ppb (21) N/A 43.0 ppb (40) N/A N/A N/A 0.49 ppb (5) N/A 14.0 μg/m3 (54) 63.0
 
Jan. 23, 2020, 10 p.m. 80.0 ppb (78) 33.0 ppb (31) N/A 47.0 ppb (44) N/A N/A N/A 0.5 ppb (6) N/A 12.0 μg/m3 (50) 78.0
 
Jan. 23, 2020, 9 p.m. 71.0 ppb (68) 28.0 ppb (26) N/A 43.0 ppb (40) N/A N/A N/A 0.5 ppb (6) N/A 9.0 μg/m3 (38) 68.0
 
Jan. 23, 2020, 8 p.m. 50.0 ppb (46) 20.0 ppb (19) N/A 30.0 ppb (28) N/A N/A N/A 0.39 ppb (4) N/A 7.0 μg/m3 (29) 46.0
 
Jan. 23, 2020, 7 p.m. 43.0 ppb (40) 18.0 ppb (17) N/A 25.0 ppb (23) N/A N/A N/A 0.33 ppb (4) N/A 8.0 μg/m3 (33) 40.0
 
Jan. 23, 2020, 6 p.m. 45.0 ppb (42) 21.0 ppb (19) N/A 24.0 ppb (22) N/A N/A N/A 0.3 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 23, 2020, 5 p.m. 46.0 ppb (43) 22.0 ppb (20) N/A 24.0 ppb (22) N/A N/A N/A 0.3 ppb (3) N/A 16.0 μg/m3 (59) 59.0
 
Jan. 23, 2020, 4 p.m. 51.0 ppb (47) 27.0 ppb (25) N/A 24.0 ppb (22) N/A N/A N/A 0.32 ppb (4) N/A 24.0 μg/m3 (76) 76.0
 
Jan. 23, 2020, 3 p.m. 73.0 ppb (70) 42.0 ppb (39) N/A 31.0 ppb (29) N/A N/A N/A 0.38 ppb (4) N/A 20.0 μg/m3 (67) 70.0
 
Jan. 23, 2020, 2 p.m. 87.0 ppb (85) 52.0 ppb (48) N/A 35.0 ppb (32) N/A N/A N/A 0.48 ppb (5) N/A 19.0 μg/m3 (65) 85.0
 
Jan. 23, 2020, 1 p.m. 92.0 ppb (90) 53.0 ppb (49) N/A 39.0 ppb (36) N/A N/A N/A 0.55 ppb (6) N/A 15.0 μg/m3 (56) 90.0
 
Jan. 23, 2020, noon 113.0 ppb (102) 70.0 ppb (67) N/A 44.0 ppb (41) N/A N/A N/A 0.67 ppb (7) N/A 17.0 μg/m3 (61) 102.0
 
Jan. 23, 2020, 11 a.m. 124.0 ppb (104) 79.0 ppb (77) N/A 45.0 ppb (42) N/A N/A N/A 0.67 ppb (7) N/A 22.0 μg/m3 (71) 104.0
 
Jan. 23, 2020, 10 a.m. 94.0 ppb (93) 51.0 ppb (47) N/A 43.0 ppb (40) N/A N/A N/A N/A N/A 17.0 μg/m3 (61) 93.0
 
Jan. 23, 2020, 9 a.m. 76.0 ppb (73) 34.0 ppb (31) N/A 41.0 ppb (38) N/A N/A N/A 0.4 ppb (4) N/A 17.0 μg/m3 (61) 73.0
 
Jan. 23, 2020, 8 a.m. 69.0 ppb (66) 29.0 ppb (27) N/A 40.0 ppb (37) N/A N/A N/A 0.45 ppb (5) N/A 19.0 μg/m3 (65) 66.0
 
Jan. 23, 2020, 7 a.m. 57.0 ppb (53) 18.0 ppb (17) N/A 39.0 ppb (36) N/A N/A N/A 0.36 ppb (4) N/A 20.0 μg/m3 (67) 67.0
 
Jan. 23, 2020, 6 a.m. N/A N/A N/A N/A N/A N/A N/A 0.45 ppb (5) N/A 17.0 μg/m3 (61) 61.0
 
Jan. 23, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A N/A 0.37 ppb (4) N/A 19.0 μg/m3 (65) 65.0
 
Jan. 23, 2020, 4 a.m. 62.0 ppb (59) 22.0 ppb (20) N/A 40.0 ppb (37) N/A N/A N/A 0.5 ppb (6) N/A 20.0 μg/m3 (67) 67.0
 
Jan. 23, 2020, 3 a.m. 96.0 ppb (95) 51.0 ppb (47) N/A 45.0 ppb (42) N/A N/A N/A 0.67 ppb (7) N/A 19.0 μg/m3 (65) 95.0
 
Jan. 23, 2020, 2 a.m. 98.0 ppb (97) 51.0 ppb (47) N/A 46.0 ppb (43) N/A N/A N/A 0.77 ppb (9) N/A 19.0 μg/m3 (65) 97.0
 
Jan. 23, 2020, 1 a.m. 99.0 ppb (98) 53.0 ppb (49) N/A 47.0 ppb (44) N/A N/A N/A 0.72 ppb (8) N/A 18.0 μg/m3 (63) 98.0
 
Jan. 23, 2020, midnight 115.0 ppb (103) 66.0 ppb (63) N/A 50.0 ppb (46) N/A N/A N/A 0.76 ppb (8) N/A 18.0 μg/m3 (63) 103.0
 
Jan. 22, 2020, 11 p.m. 92.0 ppb (90) 45.0 ppb (42) N/A 47.0 ppb (44) N/A N/A N/A 0.58 ppb (6) N/A 17.0 μg/m3 (61) 90.0
 
Jan. 22, 2020, 10 p.m. 60.0 ppb (56) 20.0 ppb (19) N/A 41.0 ppb (38) N/A N/A N/A 0.47 ppb (5) N/A 6.0 μg/m3 (25) 56.0
 
Jan. 22, 2020, 9 p.m. 39.0 ppb (36) 12.0 ppb (11) N/A 27.0 ppb (25) N/A N/A N/A 0.31 ppb (3) N/A 8.0 μg/m3 (33) 36.0
 
Jan. 22, 2020, 8 p.m. 40.0 ppb (37) 16.0 ppb (15) N/A 24.0 ppb (22) N/A N/A N/A 0.27 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
Jan. 22, 2020, 7 p.m. 38.0 ppb (35) 18.0 ppb (17) N/A 20.0 ppb (19) N/A N/A N/A 0.25 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 22, 2020, 6 p.m. 44.0 ppb (41) 22.0 ppb (20) N/A 22.0 ppb (20) N/A N/A N/A 0.25 ppb (3) N/A 17.0 μg/m3 (61) 61.0
 
Jan. 22, 2020, 5 p.m. 42.0 ppb (39) 21.0 ppb (19) N/A 21.0 ppb (19) N/A N/A N/A 0.24 ppb (3) N/A 26.0 μg/m3 (80) 80.0
 
Jan. 22, 2020, 4 p.m. 55.0 ppb (51) 29.0 ppb (27) N/A 26.0 ppb (24) N/A N/A N/A 0.3 ppb (3) N/A N/A 51.0
 
Jan. 22, 2020, 3 p.m. 94.0 ppb (93) 60.0 ppb (56) N/A 34.0 ppb (31) N/A N/A N/A 0.39 ppb (4) N/A 16.0 μg/m3 (59) 93.0
 
Jan. 22, 2020, 2 p.m. 110.0 ppb (102) 70.0 ppb (67) N/A 39.0 ppb (36) N/A N/A N/A 0.51 ppb (6) N/A 16.0 μg/m3 (59) 102.0
 
Jan. 22, 2020, 1 p.m. 129.0 ppb (105) 85.0 ppb (83) N/A 44.0 ppb (41) N/A N/A N/A 0.71 ppb (8) N/A 17.0 μg/m3 (61) 105.0
 
Jan. 22, 2020, noon 149.0 ppb (109) 102.0 ppb (100) N/A 47.0 ppb (44) N/A N/A N/A 0.85 ppb (9) N/A 16.0 μg/m3 (59) 109.0
 
Jan. 22, 2020, 11 a.m. 154.0 ppb (110) 105.0 ppb (101) N/A 48.0 ppb (44) N/A N/A N/A 0.8 ppb (9) N/A 13.0 μg/m3 (52) 110.0
 
Jan. 22, 2020, 10 a.m. 118.0 ppb (103) 72.0 ppb (69) N/A 46.0 ppb (43) N/A N/A N/A 0.62 ppb (7) N/A 14.0 μg/m3 (54) 103.0
 
Jan. 22, 2020, 9 a.m. 94.0 ppb (93) 49.0 ppb (45) N/A 45.0 ppb (42) N/A N/A N/A 0.44 ppb (5) N/A 8.0 μg/m3 (33) 93.0
 
Jan. 22, 2020, 8 a.m. 71.0 ppb (68) 28.0 ppb (26) N/A 42.0 ppb (39) N/A N/A N/A 0.36 ppb (4) N/A 10.0 μg/m3 (42) 68.0
 
Jan. 22, 2020, 7 a.m. 65.0 ppb (62) 22.0 ppb (20) N/A 43.0 ppb (40) N/A N/A N/A 0.49 ppb (5) N/A 12.0 μg/m3 (50) 62.0
 
Jan. 22, 2020, 6 a.m. 72.0 ppb (69) 29.0 ppb (27) N/A 44.0 ppb (41) N/A N/A N/A 0.41 ppb (5) N/A 10.0 μg/m3 (42) 69.0
 
Jan. 22, 2020, 5 a.m. 69.0 ppb (66) 26.0 ppb (24) N/A 43.0 ppb (40) N/A N/A N/A 0.43 ppb (5) N/A 9.0 μg/m3 (38) 66.0
 
Jan. 22, 2020, 4 a.m. 69.0 ppb (66) 25.0 ppb (23) N/A 44.0 ppb (41) N/A N/A N/A 0.52 ppb (6) N/A 14.0 μg/m3 (54) 66.0
 
Jan. 22, 2020, 3 a.m. 86.0 ppb (84) 40.0 ppb (37) N/A 47.0 ppb (44) N/A N/A N/A 0.68 ppb (8) N/A 15.0 μg/m3 (56) 84.0
 
Jan. 22, 2020, 2 a.m. 100.0 ppb (99) 52.0 ppb (48) N/A 48.0 ppb (44) N/A N/A N/A 0.67 ppb (7) N/A 14.0 μg/m3 (54) 99.0
 
Jan. 22, 2020, 1 a.m. 113.0 ppb (102) 64.0 ppb (61) N/A 49.0 ppb (45) N/A N/A N/A 0.88 ppb (10) N/A 17.0 μg/m3 (61) 102.0
 
Jan. 22, 2020, midnight 101.0 ppb (100) 53.0 ppb (49) N/A 49.0 ppb (45) N/A N/A N/A 0.71 ppb (8) N/A 12.0 μg/m3 (50) 100.0
 
Jan. 21, 2020, 11 p.m. 53.0 ppb (49) 12.0 ppb (11) N/A 41.0 ppb (38) N/A N/A N/A 0.35 ppb (4) N/A 10.0 μg/m3 (42) 49.0
 
Jan. 21, 2020, 10 p.m. 42.0 ppb (39) 9.0 ppb (8) N/A 32.0 ppb (30) N/A N/A N/A 0.3 ppb (3) N/A 9.0 μg/m3 (38) 39.0
 
Jan. 21, 2020, 9 p.m. 41.0 ppb (38) 10.0 ppb (9) N/A 30.0 ppb (28) N/A N/A N/A 0.24 ppb (3) N/A 8.0 μg/m3 (33) 38.0
 
Jan. 21, 2020, 8 p.m. 43.0 ppb (40) 17.0 ppb (16) N/A 26.0 ppb (24) N/A N/A N/A 0.27 ppb (3) N/A 7.0 μg/m3 (29) 40.0
 
Jan. 21, 2020, 7 p.m. 41.0 ppb (38) 17.0 ppb (16) N/A 24.0 ppb (22) N/A N/A N/A 0.3 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 21, 2020, 6 p.m. 42.0 ppb (39) 21.0 ppb (19) N/A 21.0 ppb (19) N/A N/A N/A 0.26 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 21, 2020, 5 p.m. 38.0 ppb (35) 17.0 ppb (16) N/A 21.0 ppb (19) N/A N/A N/A 0.22 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 21, 2020, 4 p.m. 38.0 ppb (35) 18.0 ppb (17) N/A 19.0 ppb (18) N/A N/A N/A 0.17 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 21, 2020, 3 p.m. 58.0 ppb (54) 32.0 ppb (30) N/A 26.0 ppb (24) N/A N/A N/A 0.19 ppb (2) N/A 12.0 μg/m3 (50) 54.0
 
Jan. 21, 2020, 2 p.m. 56.0 ppb (52) 30.0 ppb (28) N/A 27.0 ppb (25) N/A N/A N/A 0.19 ppb (2) N/A 9.0 μg/m3 (38) 52.0
 
Jan. 21, 2020, 1 p.m. 37.0 ppb (34) 13.0 ppb (12) N/A 23.0 ppb (21) N/A N/A N/A 0.19 ppb (2) N/A 7.0 μg/m3 (29) 34.0
 
Jan. 21, 2020, noon 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 7.0 μg/m3 (29) 50.0
 
Jan. 21, 2020, 11 a.m. 63.0 ppb (60) 28.0 ppb (26) N/A 35.0 ppb (32) N/A N/A N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 60.0
 
Jan. 21, 2020, 10 a.m. 44.0 ppb (41) 18.0 ppb (17) N/A 26.0 ppb (24) N/A N/A N/A 0.27 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 21, 2020, 9 a.m. 29.0 ppb (27) 9.0 ppb (8) 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
 
Jan. 21, 2020, 8 a.m. 22.0 ppb (20) 5.0 ppb (5) N/A 17.0 ppb (16) N/A N/A N/A 0.12 ppb (1) N/A 3.0 μg/m3 (12) 20.0
 
Jan. 21, 2020, 7 a.m. 21.0 ppb (19) 4.0 ppb (4) 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
 
Jan. 21, 2020, 6 a.m. 18.0 ppb (17) 2.0 ppb (2) N/A 16.0 ppb (15) N/A N/A N/A 0.14 ppb (2) N/A 14.0 μg/m3 (54) 54.0
 
Jan. 21, 2020, 5 a.m. 18.0 ppb (17) 3.0 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.18 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 21, 2020, 4 a.m. 23.0 ppb (21) 5.0 ppb (5) N/A 18.0 ppb (17) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 21, 2020, 3 a.m. 33.0 ppb (31) 8.0 ppb (7) N/A 25.0 ppb (23) N/A N/A N/A 0.32 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 21, 2020, 2 a.m. 30.0 ppb (28) 8.0 ppb (7) N/A 23.0 ppb (21) N/A N/A N/A 0.26 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 21, 2020, 1 a.m. 21.0 ppb (19) 5.0 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A 0.22 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 21, 2020, midnight 25.0 ppb (23) 6.0 ppb (6) N/A 19.0 ppb (18) N/A N/A N/A 0.26 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 20, 2020, 11 p.m. 30.0 ppb (28) 7.0 ppb (6) N/A 22.0 ppb (20) N/A N/A N/A 0.31 ppb (3) N/A 6.0 μg/m3 (25) 28.0
 
Jan. 20, 2020, 10 p.m. 40.0 ppb (37) 11.0 ppb (10) N/A 29.0 ppb (27) N/A N/A N/A 0.24 ppb (3) N/A 4.0 μg/m3 (17) 37.0
 
Jan. 20, 2020, 9 p.m. 33.0 ppb (31) 9.0 ppb (8) N/A 24.0 ppb (22) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 31.0
 
Jan. 20, 2020, 8 p.m. 26.0 ppb (24) 9.0 ppb (8) N/A 18.0 ppb (17) N/A N/A N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 20, 2020, 7 p.m. 35.0 ppb (32) 16.0 ppb (15) N/A 19.0 ppb (18) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 32.0
 
Jan. 20, 2020, 6 p.m. 32.0 ppb (30) 15.0 ppb (14) N/A 18.0 ppb (17) N/A N/A N/A 0.2 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 20, 2020, 5 p.m. 30.0 ppb (28) 14.0 ppb (13) N/A 15.0 ppb (14) N/A N/A N/A 0.25 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 20, 2020, 4 p.m. 31.0 ppb (29) 15.0 ppb (14) N/A 16.0 ppb (15) N/A N/A N/A 0.21 ppb (2) N/A 6.0 μg/m3 (25) 29.0
 
Jan. 20, 2020, 3 p.m. 34.0 ppb (31) 17.0 ppb (16) N/A 17.0 ppb (16) N/A N/A N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 20, 2020, 2 p.m. 43.0 ppb (40) 21.0 ppb (19) N/A 21.0 ppb (19) N/A N/A N/A 0.27 ppb (3) N/A 9.0 μg/m3 (38) 40.0
 
Jan. 20, 2020, 1 p.m. 37.0 ppb (34) 17.0 ppb (16) N/A 20.0 ppb (19) N/A N/A N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 34.0
 
Jan. 20, 2020, noon 33.0 ppb (31) 12.0 ppb (11) N/A 21.0 ppb (19) N/A N/A N/A 0.29 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 20, 2020, 11 a.m. 41.0 ppb (38) 18.0 ppb (17) N/A 22.0 ppb (20) N/A N/A N/A 0.26 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 20, 2020, 10 a.m. 33.0 ppb (31) 14.0 ppb (13) N/A 19.0 ppb (18) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
Jan. 20, 2020, 9 a.m. 23.0 ppb (21) 8.0 ppb (7) N/A 16.0 ppb (15) N/A N/A N/A 0.17 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 20, 2020, 8 a.m. 18.0 ppb (17) 5.0 ppb (5) N/A 13.0 ppb (12) N/A N/A N/A 0.14 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 20, 2020, 7 a.m. 16.0 ppb (15) 4.0 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A 0.14 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 20, 2020, 6 a.m. N/A N/A N/A N/A N/A N/A N/A 0.14 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 20, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A N/A 0.14 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 20, 2020, 4 a.m. 21.0 ppb (19) 6.0 ppb (6) N/A 15.0 ppb (14) N/A N/A N/A 0.15 ppb (2) N/A 3.0 μg/m3 (12) 19.0
 
Jan. 20, 2020, 3 a.m. 20.0 ppb (19) 5.0 ppb (5) N/A 15.0 ppb (14) N/A N/A N/A 0.15 ppb (2) N/A 2.0 μg/m3 (8) 19.0
 
Jan. 20, 2020, 2 a.m. 16.0 ppb (15) 4.0 ppb (4) N/A 12.0 ppb (11) N/A N/A N/A 0.17 ppb (2) N/A 3.0 μg/m3 (12) 15.0
 
Jan. 20, 2020, 1 a.m. 14.0 ppb (13) 4.0 ppb (4) N/A 10.0 ppb (9) N/A N/A N/A 0.18 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 20, 2020, midnight 14.0 ppb (13) 4.0 ppb (4) N/A 10.0 ppb (9) N/A N/A N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2020, 11 p.m. 13.0 ppb (12) 4.0 ppb (4) N/A 10.0 ppb (9) N/A N/A N/A 0.18 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 19, 2020, 10 p.m. 15.0 ppb (14) 4.0 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.18 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2020, 9 p.m. 15.0 ppb (14) 5.0 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2020, 8 p.m. 14.0 ppb (13) 5.0 ppb (5) N/A 9.0 ppb (8) N/A N/A N/A 0.18 ppb (2) N/A 2.0 μg/m3 (8) 13.0
 
Jan. 19, 2020, 7 p.m. 15.0 ppb (14) 6.0 ppb (6) N/A 9.0 ppb (8) N/A N/A N/A 0.19 ppb (2) N/A 3.0 μg/m3 (12) 14.0
 
Jan. 19, 2020, 6 p.m. 15.0 ppb (14) 7.0 ppb (6) N/A 8.0 ppb (7) N/A N/A N/A 0.18 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 19, 2020, 5 p.m. 14.0 ppb (13) 6.0 ppb (6) N/A 8.0 ppb (7) N/A N/A N/A 0.17 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2020, 4 p.m. 17.0 ppb (16) 8.0 ppb (7) N/A 9.0 ppb (8) N/A N/A N/A 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2020, 3 p.m. 32.0 ppb (30) 16.0 ppb (15) N/A 16.0 ppb (15) N/A N/A N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 19, 2020, 2 p.m. 52.0 ppb (48) 29.0 ppb (27) N/A 23.0 ppb (21) N/A N/A N/A 0.44 ppb (5) N/A 24.0 μg/m3 (76) 76.0
 
Jan. 19, 2020, 1 p.m. 60.0 ppb (56) 33.0 ppb (31) N/A 27.0 ppb (25) N/A N/A N/A 0.5 ppb (6) N/A 20.0 μg/m3 (67) 67.0
 
Jan. 19, 2020, noon 59.0 ppb (55) 29.0 ppb (27) N/A 30.0 ppb (28) N/A N/A N/A 0.47 ppb (5) N/A 18.0 μg/m3 (63) 63.0
 
Jan. 19, 2020, 11 a.m. 58.0 ppb (54) 26.0 ppb (24) N/A 32.0 ppb (30) N/A N/A N/A 0.43 ppb (5) N/A 22.0 μg/m3 (71) 71.0
 
Jan. 19, 2020, 10 a.m. 51.0 ppb (47) 19.0 ppb (18) N/A 32.0 ppb (30) N/A N/A N/A 0.4 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 19, 2020, 9 a.m. 45.0 ppb (42) 14.0 ppb (13) N/A 32.0 ppb (30) N/A N/A N/A 0.34 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 19, 2020, 8 a.m. 55.0 ppb (51) 21.0 ppb (19) N/A 34.0 ppb (31) N/A N/A N/A 0.32 ppb (4) N/A 17.0 μg/m3 (61) 61.0
 
Jan. 19, 2020, 7 a.m. 59.0 ppb (55) 22.0 ppb (20) N/A 36.0 ppb (33) N/A N/A N/A 0.34 ppb (4) N/A 12.0 μg/m3 (50) 55.0
 
Jan. 19, 2020, 6 a.m. 84.0 ppb (82) 42.0 ppb (39) N/A 42.0 ppb (39) N/A N/A N/A 0.47 ppb (5) N/A 15.0 μg/m3 (56) 82.0
 
Jan. 19, 2020, 5 a.m. 78.0 ppb (76) 34.0 ppb (31) N/A 44.0 ppb (41) N/A N/A N/A 0.37 ppb (4) N/A 19.0 μg/m3 (65) 76.0
 
Jan. 19, 2020, 4 a.m. 60.0 ppb (56) 21.0 ppb (19) N/A 39.0 ppb (36) N/A N/A N/A 0.33 ppb (4) N/A 17.0 μg/m3 (61) 61.0
 
Jan. 19, 2020, 3 a.m. 36.0 ppb (33) 9.0 ppb (8) N/A 27.0 ppb (25) N/A N/A N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 19, 2020, 2 a.m. 35.0 ppb (32) 8.0 ppb (7) N/A 27.0 ppb (25) N/A N/A N/A 0.22 ppb (2) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 19, 2020, 1 a.m. 16.0 ppb (15) 2.0 ppb (2) N/A 14.0 ppb (13) N/A N/A N/A 0.1 ppb (1) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2020, midnight 13.0 ppb (12) 2.0 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.1 ppb (1) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 18, 2020, 11 p.m. 19.0 ppb (18) 3.0 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.17 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 18, 2020, 10 p.m. 25.0 ppb (23) 7.0 ppb (6) N/A 18.0 ppb (17) N/A N/A N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2020, 9 p.m. 36.0 ppb (33) 13.0 ppb (12) N/A 23.0 ppb (21) N/A N/A N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2020, 8 p.m. 31.0 ppb (29) 11.0 ppb (10) N/A 20.0 ppb (19) N/A N/A N/A 0.28 ppb (3) N/A 4.0 μg/m3 (17) 29.0
 
Jan. 18, 2020, 7 p.m. 35.0 ppb (32) 12.0 ppb (11) N/A 23.0 ppb (21) N/A N/A N/A 0.29 ppb (3) N/A 6.0 μg/m3 (25) 32.0
 
Jan. 18, 2020, 6 p.m. 29.0 ppb (27) 9.0 ppb (8) N/A 20.0 ppb (19) N/A N/A N/A 0.24 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 18, 2020, 5 p.m. 26.0 ppb (24) 7.0 ppb (6) N/A 19.0 ppb (18) N/A N/A N/A 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2020, 4 p.m. 31.0 ppb (29) 9.0 ppb (8) N/A 22.0 ppb (20) N/A N/A N/A 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2020, 3 p.m. 30.0 ppb (28) 11.0 ppb (10) N/A 19.0 ppb (18) N/A N/A N/A 0.27 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 18, 2020, 2 p.m. 35.0 ppb (32) 13.0 ppb (12) N/A 22.0 ppb (20) N/A N/A N/A 0.29 ppb (3) N/A 6.0 μg/m3 (25) 32.0
 
Jan. 18, 2020, 1 p.m. 33.0 ppb (31) 11.0 ppb (10) N/A 22.0 ppb (20) N/A N/A N/A 0.27 ppb (3) N/A 7.0 μg/m3 (29) 31.0
 
Jan. 18, 2020, noon 34.0 ppb (31) 12.0 ppb (11) N/A 22.0 ppb (20) N/A N/A N/A 0.29 ppb (3) N/A 5.0 μg/m3 (21) 31.0
 
Jan. 18, 2020, 11 a.m. 32.0 ppb (30) 11.0 ppb (10) N/A 21.0 ppb (19) N/A N/A N/A 0.22 ppb (2) N/A 4.0 μg/m3 (17) 30.0
 
Jan. 18, 2020, 10 a.m. 29.0 ppb (27) 9.0 ppb (8) N/A 20.0 ppb (19) N/A N/A N/A 0.23 ppb (3) N/A 3.0 μg/m3 (12) 27.0
 
Jan. 18, 2020, 9 a.m. 20.0 ppb (19) 4.0 ppb (4) N/A 16.0 ppb (15) N/A N/A N/A 0.13 ppb (1) N/A 2.0 μg/m3 (8) 19.0
 
Jan. 18, 2020, 8 a.m. 17.0 ppb (16) 4.0 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.14 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2020, 7 a.m. 17.0 ppb (16) 3.0 ppb (3) N/A 15.0 ppb (14) N/A N/A N/A 0.14 ppb (2) N/A 7.0 μg/m3 (29) 29.0