AQSQID: 530330030

Site Name: Seattle-10th & Weller

Location: Seattle, WA

Reporting: True, Located: True

Current AQI: 20.0

Seattle WA, US: 47.597222, -122.319722

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
May 25, 2019, 5 p.m. 21.8 ppb (20) 12.0 ppb (11) N/A 10.0 ppb (9) N/A N/A N/A 0.36 ppb (4) N/A 2.0 μg/m3 (8) 20.0
 
May 25, 2019, 4 p.m. 23.5 ppb (22) 11.4 ppb (11) N/A 12.0 ppb (11) N/A N/A N/A 0.34 ppb (4) N/A 2.0 μg/m3 (8) 22.0
 
May 25, 2019, 3 p.m. 30.7 ppb (28) 15.5 ppb (14) N/A 15.0 ppb (14) N/A N/A N/A 0.42 ppb (5) N/A 1.0 μg/m3 (4) 28.0
 
May 25, 2019, 2 p.m. 25.9 ppb (24) 12.2 ppb (11) N/A 14.0 ppb (13) N/A N/A N/A 0.37 ppb (4) N/A 4.0 μg/m3 (17) 24.0
 
May 25, 2019, 1 p.m. 23.5 ppb (22) 9.2 ppb (9) N/A 14.0 ppb (13) N/A N/A N/A 0.32 ppb (4) N/A 5.0 μg/m3 (21) 22.0
 
May 25, 2019, noon 15.7 ppb (15) 5.5 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A 0.31 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 25, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
May 25, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
May 25, 2019, 9 a.m. 13.3 ppb (12) 4.2 ppb (4) N/A 9.0 ppb (8) N/A N/A N/A 0.27 ppb (3) N/A 2.0 μg/m3 (8) 12.0
 
May 25, 2019, 8 a.m. 11.7 ppb (11) 3.2 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.3 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
May 25, 2019, 7 a.m. 16.4 ppb (15) 5.6 ppb (5) N/A 11.0 ppb (10) N/A N/A N/A 0.31 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 25, 2019, 6 a.m. 19.2 ppb (18) 8.0 ppb (7) N/A 11.0 ppb (10) N/A N/A N/A 0.35 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
May 25, 2019, 5 a.m. 24.9 ppb (23) 10.2 ppb (9) N/A 15.0 ppb (14) N/A N/A N/A 0.41 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
May 25, 2019, 4 a.m. 24.5 ppb (23) 10.3 ppb (10) N/A 14.0 ppb (13) N/A N/A N/A 0.45 ppb (5) N/A 4.0 μg/m3 (17) 23.0
 
May 25, 2019, 3 a.m. 28.1 ppb (26) 13.2 ppb (12) N/A 15.0 ppb (14) N/A N/A N/A 0.43 ppb (5) N/A 6.0 μg/m3 (25) 26.0
 
May 25, 2019, 2 a.m. 32.8 ppb (30) 16.6 ppb (15) N/A 16.0 ppb (15) N/A N/A N/A 0.41 ppb (5) N/A 7.0 μg/m3 (29) 30.0
 
May 25, 2019, 1 a.m. 33.8 ppb (31) 18.5 ppb (17) N/A 15.0 ppb (14) N/A N/A N/A 0.37 ppb (4) N/A 6.0 μg/m3 (25) 31.0
 
May 25, 2019, midnight 31.6 ppb (29) 16.6 ppb (15) N/A 15.0 ppb (14) N/A N/A N/A 0.39 ppb (4) N/A 5.0 μg/m3 (21) 29.0
 
May 24, 2019, 11 p.m. 30.9 ppb (29) 16.9 ppb (16) N/A 14.0 ppb (13) N/A N/A N/A 0.37 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
May 24, 2019, 10 p.m. 41.9 ppb (39) 28.4 ppb (26) N/A 14.0 ppb (13) N/A N/A N/A 0.42 ppb (5) N/A 3.0 μg/m3 (12) 39.0
 
May 24, 2019, 9 p.m. 44.4 ppb (41) 24.7 ppb (23) N/A 20.0 ppb (19) N/A N/A N/A 0.41 ppb (5) N/A 3.0 μg/m3 (12) 41.0
 
May 24, 2019, 8 p.m. 46.8 ppb (43) 28.7 ppb (27) N/A 18.0 ppb (17) N/A N/A N/A 0.42 ppb (5) N/A 3.0 μg/m3 (12) 43.0
 
May 24, 2019, 7 p.m. 45.4 ppb (42) 23.8 ppb (22) N/A 22.0 ppb (20) N/A N/A N/A 0.43 ppb (5) N/A 6.0 μg/m3 (25) 42.0
 
May 24, 2019, 6 p.m. 45.5 ppb (42) 23.5 ppb (22) N/A 22.0 ppb (20) N/A N/A N/A 0.39 ppb (4) N/A 7.0 μg/m3 (29) 42.0
 
May 24, 2019, 5 p.m. 44.6 ppb (41) 27.4 ppb (25) N/A 17.0 ppb (16) N/A N/A N/A 0.32 ppb (4) N/A 9.0 μg/m3 (38) 41.0
 
May 24, 2019, 4 p.m. 46.5 ppb (43) 24.2 ppb (22) N/A 22.0 ppb (20) N/A N/A N/A 0.29 ppb (3) N/A 8.0 μg/m3 (33) 43.0
 
May 24, 2019, 3 p.m. 47.5 ppb (44) 23.6 ppb (22) N/A 24.0 ppb (22) N/A N/A N/A 0.29 ppb (3) N/A 9.0 μg/m3 (38) 44.0
 
May 24, 2019, 2 p.m. 36.5 ppb (34) 15.1 ppb (14) N/A 21.0 ppb (19) N/A N/A N/A 0.3 ppb (3) N/A 8.0 μg/m3 (33) 34.0
 
May 24, 2019, 1 p.m. 38.5 ppb (36) 20.1 ppb (19) N/A 18.0 ppb (17) N/A N/A N/A 0.35 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
May 24, 2019, noon 31.9 ppb (30) 15.0 ppb (14) N/A 17.0 ppb (16) N/A N/A N/A 0.4 ppb (4) N/A 7.0 μg/m3 (29) 30.0
 
May 24, 2019, 11 a.m. 17.5 ppb (16) 7.1 ppb (7) N/A 10.0 ppb (9) N/A N/A N/A 0.2 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
May 24, 2019, 10 a.m. 10.5 ppb (10) 3.6 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A 0.16 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
May 24, 2019, 9 a.m. 10.6 ppb (10) 3.7 ppb (3) N/A 7.0 ppb (6) N/A N/A N/A 0.15 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
May 24, 2019, 8 a.m. 8.9 ppb (8) 3.4 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.15 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
May 24, 2019, 7 a.m. 12.0 ppb (11) 5.3 ppb (5) N/A 7.0 ppb (6) N/A N/A N/A 0.2 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
May 24, 2019, 6 a.m. 23.9 ppb (22) 9.6 ppb (9) N/A 14.0 ppb (13) N/A N/A N/A 0.3 ppb (3) N/A 15.0 μg/m3 (56) 56.0
 
May 24, 2019, 5 a.m. 59.1 ppb (55) 26.0 ppb (24) N/A 33.0 ppb (31) N/A N/A N/A 0.41 ppb (5) N/A 11.0 μg/m3 (46) 55.0
 
May 24, 2019, 4 a.m. 84.3 ppb (82) 38.7 ppb (36) N/A 46.0 ppb (43) N/A N/A N/A 0.54 ppb (6) N/A 10.0 μg/m3 (42) 82.0
 
May 24, 2019, 3 a.m. 138.6 ppb (107) 84.5 ppb (82) N/A 54.0 ppb (50) N/A N/A N/A 0.83 ppb (9) N/A 19.0 μg/m3 (65) 107.0
 
May 24, 2019, 2 a.m. 113.2 ppb (102) 64.1 ppb (61) N/A 49.0 ppb (45) N/A N/A N/A 0.71 ppb (8) N/A 15.0 μg/m3 (56) 102.0
 
May 24, 2019, 1 a.m. 99.2 ppb (98) 56.8 ppb (53) N/A 42.0 ppb (39) N/A N/A N/A 0.67 ppb (7) N/A 14.0 μg/m3 (54) 98.0
 
May 24, 2019, midnight 47.6 ppb (44) 20.5 ppb (19) N/A 27.0 ppb (25) N/A N/A N/A 0.47 ppb (5) N/A 7.0 μg/m3 (29) 44.0
 
May 23, 2019, 11 p.m. 71.2 ppb (68) 39.7 ppb (37) N/A 32.0 ppb (30) N/A N/A N/A 0.48 ppb (5) N/A 11.0 μg/m3 (46) 68.0
 
May 23, 2019, 10 p.m. 42.0 ppb (39) 21.3 ppb (20) N/A 21.0 ppb (19) N/A N/A N/A 0.44 ppb (5) N/A 6.0 μg/m3 (25) 39.0
 
May 23, 2019, 9 p.m. 45.8 ppb (42) 25.3 ppb (23) N/A 20.0 ppb (19) N/A N/A N/A 0.45 ppb (5) N/A 8.0 μg/m3 (33) 42.0
 
May 23, 2019, 8 p.m. 69.3 ppb (66) 41.5 ppb (38) N/A 28.0 ppb (26) N/A N/A N/A 0.54 ppb (6) N/A 16.0 μg/m3 (59) 66.0
 
May 23, 2019, 7 p.m. 57.0 ppb (53) 33.3 ppb (31) N/A 24.0 ppb (22) N/A N/A N/A 0.5 ppb (6) N/A 16.0 μg/m3 (59) 59.0
 
May 23, 2019, 6 p.m. 67.8 ppb (65) 46.3 ppb (43) N/A 22.0 ppb (20) N/A N/A N/A 0.48 ppb (5) N/A 14.0 μg/m3 (54) 65.0
 
May 23, 2019, 5 p.m. 73.3 ppb (71) 52.1 ppb (48) N/A 21.0 ppb (19) N/A N/A N/A 0.47 ppb (5) N/A 15.0 μg/m3 (56) 71.0
 
May 23, 2019, 4 p.m. 87.4 ppb (86) 58.0 ppb (54) N/A 29.0 ppb (27) N/A N/A N/A 0.43 ppb (5) N/A 16.0 μg/m3 (59) 86.0
 
May 23, 2019, 3 p.m. 79.3 ppb (77) 51.4 ppb (48) N/A 28.0 ppb (26) N/A N/A N/A 0.45 ppb (5) N/A 15.0 μg/m3 (56) 77.0
 
May 23, 2019, 2 p.m. 82.4 ppb (80) 56.3 ppb (52) N/A 26.0 ppb (24) N/A N/A N/A 0.51 ppb (6) N/A 15.0 μg/m3 (56) 80.0
 
May 23, 2019, 1 p.m. 117.2 ppb (103) 84.4 ppb (82) N/A 33.0 ppb (31) N/A N/A N/A 0.67 ppb (7) N/A 18.0 μg/m3 (63) 103.0
 
May 23, 2019, noon 89.5 ppb (88) 65.1 ppb (62) N/A 24.0 ppb (22) N/A N/A N/A 0.8 ppb (9) N/A 15.0 μg/m3 (56) 88.0
 
May 23, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 13.0 μg/m3 (52) 52.0
 
May 23, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
May 23, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
May 23, 2019, 8 a.m. 54.9 ppb (51) 16.7 ppb (15) N/A 38.0 ppb (35) N/A N/A N/A 0.3 ppb (3) N/A 10.0 μg/m3 (42) 51.0
 
May 23, 2019, 7 a.m. 55.3 ppb (51) 17.4 ppb (16) N/A 38.0 ppb (35) N/A N/A N/A 0.34 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
May 23, 2019, 6 a.m. 36.1 ppb (33) 10.9 ppb (10) N/A 25.0 ppb (23) N/A N/A N/A 0.33 ppb (4) N/A 18.0 μg/m3 (63) 63.0
 
May 23, 2019, 5 a.m. 26.4 ppb (24) 5.0 ppb (5) N/A 21.0 ppb (19) N/A N/A N/A 0.43 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
May 23, 2019, 4 a.m. 10.5 ppb (10) 1.0 ppb (1) N/A 10.0 ppb (9) N/A N/A N/A 0.29 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
May 23, 2019, 3 a.m. 10.4 ppb (10) 1.6 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 23, 2019, 2 a.m. 12.2 ppb (11) 3.4 ppb (3) N/A 9.0 ppb (8) N/A N/A N/A 0.32 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
May 23, 2019, 1 a.m. 26.0 ppb (24) 10.4 ppb (10) N/A 16.0 ppb (15) N/A N/A N/A 0.46 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
May 23, 2019, midnight 44.1 ppb (41) 19.6 ppb (18) N/A 24.0 ppb (22) N/A N/A N/A 0.41 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
May 22, 2019, 11 p.m. 59.0 ppb (55) 29.6 ppb (27) N/A 29.0 ppb (27) N/A N/A N/A 0.44 ppb (5) N/A 8.0 μg/m3 (33) 55.0
 
May 22, 2019, 10 p.m. 53.7 ppb (50) 29.4 ppb (27) N/A 24.0 ppb (22) N/A N/A N/A 0.43 ppb (5) N/A N/A 50.0
 
May 22, 2019, 9 p.m. 52.1 ppb (48) 28.5 ppb (26) N/A 24.0 ppb (22) N/A N/A N/A 0.53 ppb (6) N/A 7.0 μg/m3 (29) 48.0
 
May 22, 2019, 8 p.m. 53.6 ppb (50) 30.5 ppb (28) N/A 23.0 ppb (21) N/A N/A N/A 0.56 ppb (6) N/A 7.0 μg/m3 (29) 50.0
 
May 22, 2019, 7 p.m. 61.3 ppb (58) 39.2 ppb (36) N/A 22.0 ppb (20) N/A N/A N/A 0.48 ppb (5) N/A 10.0 μg/m3 (42) 58.0
 
May 22, 2019, 6 p.m. 96.5 ppb (95) 67.3 ppb (64) N/A 29.0 ppb (27) N/A N/A N/A 0.58 ppb (6) N/A 16.0 μg/m3 (59) 95.0
 
May 22, 2019, 5 p.m. 83.3 ppb (81) 55.5 ppb (52) N/A 28.0 ppb (26) N/A N/A N/A 0.46 ppb (5) N/A 14.0 μg/m3 (54) 81.0
 
May 22, 2019, 4 p.m. 131.4 ppb (106) 97.6 ppb (96) N/A 34.0 ppb (31) N/A N/A N/A 0.63 ppb (7) N/A 20.0 μg/m3 (67) 106.0
 
May 22, 2019, 3 p.m. 159.5 ppb (111) 129.8 ppb (106) N/A 30.0 ppb (28) N/A N/A N/A 0.7 ppb (8) N/A 21.0 μg/m3 (69) 111.0
 
May 22, 2019, 2 p.m. 65.3 ppb (62) 46.1 ppb (43) N/A 19.0 ppb (18) N/A N/A N/A 0.58 ppb (6) N/A 7.0 μg/m3 (29) 62.0
 
May 22, 2019, 1 p.m. 139.5 ppb (107) 107.0 ppb (101) N/A 32.0 ppb (30) N/A N/A N/A 0.96 ppb (11) N/A 18.0 μg/m3 (63) 107.0
 
May 22, 2019, noon 79.3 ppb (77) 59.2 ppb (56) N/A 20.0 ppb (19) N/A N/A N/A 0.75 ppb (8) N/A 12.0 μg/m3 (50) 77.0
 
May 22, 2019, 11 a.m. 19.8 ppb (18) 4.7 ppb (4) N/A 15.0 ppb (14) N/A N/A N/A 0.29 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
May 22, 2019, 10 a.m. 21.2 ppb (20) 4.9 ppb (5) N/A 16.0 ppb (15) N/A N/A N/A 0.29 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 22, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
May 22, 2019, 8 a.m. 38.2 ppb (35) 12.5 ppb (12) N/A 26.0 ppb (24) N/A N/A N/A 0.43 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
May 22, 2019, 7 a.m. 62.4 ppb (59) 28.4 ppb (26) N/A 34.0 ppb (31) N/A N/A N/A 0.48 ppb (5) N/A 12.0 μg/m3 (50) 59.0
 
May 22, 2019, 6 a.m. 23.7 ppb (22) 3.2 ppb (3) N/A 21.0 ppb (19) N/A N/A N/A 0.39 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
May 22, 2019, 5 a.m. 30.9 ppb (29) 5.9 ppb (5) N/A 25.0 ppb (23) N/A N/A N/A 0.39 ppb (4) N/A 6.0 μg/m3 (25) 29.0
 
May 22, 2019, 4 a.m. 91.1 ppb (89) 46.9 ppb (43) N/A N/A N/A N/A N/A 0.66 ppb (7) N/A 17.0 μg/m3 (61) 89.0
 
May 22, 2019, 3 a.m. 15.5 ppb (14) 4.0 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.32 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
May 22, 2019, 2 a.m. 9.6 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.26 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
May 22, 2019, 1 a.m. 9.6 ppb (9) 2.3 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
May 22, 2019, midnight 8.1 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.24 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 21, 2019, 11 p.m. 9.2 ppb (9) 2.6 ppb (2) N/A 7.0 ppb (6) N/A N/A N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 21, 2019, 10 p.m. 9.8 ppb (9) 3.5 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.25 ppb (3) N/A 3.0 μg/m3 (12) 12.0
 
May 21, 2019, 9 p.m. 16.5 ppb (15) 6.6 ppb (6) N/A 10.0 ppb (9) N/A N/A N/A 0.31 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
May 21, 2019, 8 p.m. 40.4 ppb (37) 22.5 ppb (21) N/A 18.0 ppb (17) N/A N/A N/A 0.49 ppb (5) N/A 8.0 μg/m3 (33) 37.0
 
May 21, 2019, 7 p.m. 28.4 ppb (26) 13.7 ppb (13) N/A 15.0 ppb (14) N/A N/A N/A 0.4 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
May 21, 2019, 6 p.m. 18.7 ppb (17) 8.1 ppb (8) N/A 11.0 ppb (10) N/A N/A N/A 0.31 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
May 21, 2019, 5 p.m. 13.6 ppb (13) 4.8 ppb (4) N/A 9.0 ppb (8) N/A N/A N/A 0.24 ppb (3) N/A 1.0 μg/m3 (4) 13.0
 
May 21, 2019, 4 p.m. 25.1 ppb (23) 12.3 ppb (11) N/A 13.0 ppb (12) N/A N/A N/A 0.29 ppb (3) N/A 0.0 μg/m3 (0) 23.0
 
May 21, 2019, 3 p.m. 12.9 ppb (12) 3.0 ppb (3) N/A 10.0 ppb (9) N/A N/A N/A 0.23 ppb (3) N/A -1.0 μg/m3 (0) 12.0
 
May 21, 2019, 2 p.m. 11.1 ppb (10) 2.1 ppb (2) N/A 9.0 ppb (8) N/A N/A N/A 0.23 ppb (3) N/A 0.0 μg/m3 (0) 10.0
 
May 21, 2019, 1 p.m. 15.6 ppb (14) 5.9 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A 0.21 ppb (2) N/A 0.0 μg/m3 (0) 14.0
 
May 21, 2019, noon 11.2 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (6) N/A N/A N/A 0.22 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
May 21, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
May 21, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.0 μg/m3 (0) N/A
May 21, 2019, 9 a.m. 2.9 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (2) N/A 1.0 μg/m3 (4) 4.0
 
May 21, 2019, 8 a.m. 2.9 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
May 21, 2019, 7 a.m. 4.3 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A 0.16 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
May 21, 2019, 6 a.m. 3.7 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A 0.16 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 21, 2019, 5 a.m. 4.8 ppb (4) 0.5 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A 0.18 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
May 21, 2019, 4 a.m. 5.2 ppb (5) 0.6 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
May 21, 2019, 3 a.m. 5.8 ppb (5) 0.6 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.21 ppb (2) N/A 3.0 μg/m3 (12) 12.0
 
May 21, 2019, 2 a.m. 9.3 ppb (9) 1.6 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A 2.0 μg/m3 (8) 9.0
 
May 21, 2019, 1 a.m. 13.2 ppb (12) 2.1 ppb (2) N/A 11.0 ppb (10) N/A N/A N/A 0.27 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
May 21, 2019, midnight 23.5 ppb (22) 7.8 ppb (7) N/A 16.0 ppb (15) N/A N/A N/A 0.31 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
May 20, 2019, 11 p.m. 46.2 ppb (43) 20.6 ppb (19) N/A 26.0 ppb (24) N/A N/A N/A 0.48 ppb (5) N/A 5.0 μg/m3 (21) 43.0
 
May 20, 2019, 10 p.m. 46.4 ppb (43) 22.7 ppb (21) N/A 24.0 ppb (22) N/A N/A N/A 0.45 ppb (5) N/A 5.0 μg/m3 (21) 43.0
 
May 20, 2019, 9 p.m. 40.5 ppb (38) 24.1 ppb (22) N/A 16.0 ppb (15) N/A N/A N/A 0.42 ppb (5) N/A 4.0 μg/m3 (17) 38.0
 
May 20, 2019, 8 p.m. 47.8 ppb (44) 25.6 ppb (24) N/A 22.0 ppb (20) N/A N/A N/A 0.46 ppb (5) N/A 2.0 μg/m3 (8) 44.0
 
May 20, 2019, 7 p.m. 45.5 ppb (42) 26.5 ppb (25) N/A 19.0 ppb (18) N/A N/A N/A 0.41 ppb (5) N/A 4.0 μg/m3 (17) 42.0
 
May 20, 2019, 6 p.m. 49.0 ppb (45) 26.6 ppb (25) N/A 22.0 ppb (20) N/A N/A N/A 0.38 ppb (4) N/A 6.0 μg/m3 (25) 45.0
 
May 20, 2019, 5 p.m. 46.9 ppb (43) 23.5 ppb (22) N/A 23.0 ppb (21) N/A N/A N/A 0.37 ppb (4) N/A 5.0 μg/m3 (21) 43.0
 
May 20, 2019, 4 p.m. 45.0 ppb (42) 19.9 ppb (18) N/A 25.0 ppb (23) N/A N/A N/A 0.36 ppb (4) N/A 5.0 μg/m3 (21) 42.0
 
May 20, 2019, 3 p.m. 49.5 ppb (46) 22.6 ppb (21) N/A 27.0 ppb (25) N/A N/A N/A 0.37 ppb (4) N/A 7.0 μg/m3 (29) 46.0
 
May 20, 2019, 2 p.m. 48.8 ppb (45) 20.5 ppb (19) N/A 28.0 ppb (26) N/A N/A N/A 0.39 ppb (4) N/A 4.0 μg/m3 (17) 45.0
 
May 20, 2019, 1 p.m. 52.3 ppb (48) 25.9 ppb (24) N/A 26.0 ppb (24) N/A N/A N/A 0.46 ppb (5) N/A 0.0 μg/m3 (0) 48.0
 
May 20, 2019, noon 43.1 ppb (40) 21.9 ppb (20) N/A 21.0 ppb (19) N/A N/A N/A 0.43 ppb (5) N/A 3.0 μg/m3 (12) 40.0
 
May 20, 2019, 11 a.m. 19.4 ppb (18) 8.0 ppb (7) N/A 11.0 ppb (10) N/A N/A N/A 0.26 ppb (3) N/A 3.0 μg/m3 (12) 18.0
 
May 20, 2019, 10 a.m. 15.9 ppb (15) 4.5 ppb (4) N/A 11.0 ppb (10) N/A N/A N/A 0.21 ppb (2) N/A 1.0 μg/m3 (4) 15.0
 
May 20, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 8.0
 
May 20, 2019, 8 a.m. 17.4 ppb (16) 4.1 ppb (4) N/A 13.0 ppb (12) N/A N/A N/A 0.19 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
May 20, 2019, 7 a.m. 12.6 ppb (12) 4.0 ppb (4) N/A 9.0 ppb (8) N/A N/A N/A 0.25 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
May 20, 2019, 6 a.m. 30.6 ppb (28) 6.9 ppb (6) N/A 24.0 ppb (22) N/A N/A N/A 0.37 ppb (4) N/A 6.0 μg/m3 (25) 28.0
 
May 20, 2019, 5 a.m. 57.9 ppb (54) 21.1 ppb (20) N/A 37.0 ppb (34) N/A N/A N/A 0.52 ppb (6) N/A 8.0 μg/m3 (33) 54.0
 
May 20, 2019, 4 a.m. 33.2 ppb (31) 9.4 ppb (9) N/A 24.0 ppb (22) N/A N/A N/A 0.48 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
May 20, 2019, 3 a.m. 34.9 ppb (32) 13.1 ppb (12) N/A 22.0 ppb (20) N/A N/A N/A 0.57 ppb (6) N/A 8.0 μg/m3 (33) 33.0
 
May 20, 2019, 2 a.m. 35.6 ppb (33) 13.0 ppb (12) N/A 23.0 ppb (21) N/A N/A N/A 0.57 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
May 20, 2019, 1 a.m. 49.4 ppb (46) 21.5 ppb (20) N/A 28.0 ppb (26) N/A N/A N/A 0.58 ppb (6) N/A 8.0 μg/m3 (33) 46.0
 
May 20, 2019, midnight 30.6 ppb (28) 13.0 ppb (12) N/A 18.0 ppb (17) N/A N/A N/A 0.48 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
May 19, 2019, 11 p.m. 34.3 ppb (32) 16.3 ppb (15) N/A 18.0 ppb (17) N/A N/A N/A 0.4 ppb (4) N/A 6.0 μg/m3 (25) 32.0
 
May 19, 2019, 10 p.m. 34.3 ppb (32) 18.0 ppb (17) N/A 16.0 ppb (15) N/A N/A N/A 0.4 ppb (4) N/A 4.0 μg/m3 (17) 32.0
 
May 19, 2019, 9 p.m. 32.3 ppb (30) 17.7 ppb (16) N/A 15.0 ppb (14) N/A N/A N/A 0.39 ppb (4) N/A 4.0 μg/m3 (17) 30.0
 
May 19, 2019, 8 p.m. 38.8 ppb (36) 20.6 ppb (19) N/A 18.0 ppb (17) N/A N/A N/A 0.38 ppb (4) N/A 7.0 μg/m3 (29) 36.0
 
May 19, 2019, 7 p.m. 36.5 ppb (34) 20.1 ppb (19) N/A 16.0 ppb (15) N/A N/A N/A 0.34 ppb (4) N/A 6.0 μg/m3 (25) 34.0
 
May 19, 2019, 6 p.m. 56.2 ppb (52) 32.7 ppb (30) N/A 24.0 ppb (22) N/A N/A N/A 0.42 ppb (5) N/A 6.0 μg/m3 (25) 52.0
 
May 19, 2019, 5 p.m. 58.1 ppb (54) 34.8 ppb (32) N/A 23.0 ppb (21) N/A N/A N/A 0.46 ppb (5) N/A 8.0 μg/m3 (33) 54.0
 
May 19, 2019, 4 p.m. 37.1 ppb (34) 21.4 ppb (20) N/A 16.0 ppb (15) N/A N/A N/A 0.41 ppb (5) N/A 1.0 μg/m3 (4) 34.0
 
May 19, 2019, 3 p.m. 15.9 ppb (15) 5.9 ppb (5) N/A 10.0 ppb (9) N/A N/A N/A 0.24 ppb (3) N/A -1.0 μg/m3 (0) 15.0
 
May 19, 2019, 2 p.m. 8.7 ppb (8) 1.0 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.16 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
May 19, 2019, 1 p.m. 17.1 ppb (16) 3.7 ppb (3) 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
 
May 19, 2019, noon 30.0 ppb (28) 10.9 ppb (10) N/A 19.0 ppb (18) N/A N/A N/A 0.37 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
May 19, 2019, 11 a.m. 22.7 ppb (21) 4.5 ppb (4) N/A 18.0 ppb (17) N/A N/A N/A 0.32 ppb (4) N/A 4.0 μg/m3 (17) 21.0
 
May 19, 2019, 10 a.m. 15.6 ppb (14) 2.2 ppb (2) N/A 13.0 ppb (12) N/A N/A N/A 0.26 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 19, 2019, 9 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
May 19, 2019, 8 a.m. 21.9 ppb (20) 3.6 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A 0.35 ppb (4) N/A 4.0 μg/m3 (17) 20.0
 
May 19, 2019, 7 a.m. 32.3 ppb (30) 8.9 ppb (8) N/A 23.0 ppb (21) N/A N/A N/A 0.45 ppb (5) N/A 5.0 μg/m3 (21) 30.0
 
May 19, 2019, 6 a.m. 33.4 ppb (31) 9.7 ppb (9) N/A 24.0 ppb (22) N/A N/A N/A 0.45 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
May 19, 2019, 5 a.m. 19.2 ppb (18) 0.6 ppb (1) N/A 19.0 ppb (18) N/A N/A N/A 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
May 19, 2019, 4 a.m. 15.7 ppb (15) 1.4 ppb (1) N/A 14.0 ppb (13) N/A N/A N/A 0.32 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
May 19, 2019, 3 a.m. 9.9 ppb (9) 1.2 ppb (1) N/A 9.0 ppb (8) N/A N/A N/A 0.27 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 19, 2019, 2 a.m. 8.9 ppb (8) 1.2 ppb (1) N/A 8.0 ppb (7) N/A N/A N/A 0.25 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
May 19, 2019, 1 a.m. 10.1 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A N/A N/A 0.28 ppb (3) N/A 2.0 μg/m3 (8) 9.0
 
May 19, 2019, midnight 22.4 ppb (21) 8.9 ppb (8) N/A 14.0 ppb (13) N/A N/A N/A 0.4 ppb (4) N/A 1.0 μg/m3 (4) 21.0
 
May 18, 2019, 11 p.m. 39.1 ppb (36) 18.6 ppb (17) N/A 20.0 ppb (19) N/A N/A N/A 0.47 ppb (5) N/A 3.0 μg/m3 (12) 36.0
 
May 18, 2019, 10 p.m. 36.7 ppb (34) 19.4 ppb (18) N/A 17.0 ppb (16) N/A N/A N/A 0.45 ppb (5) N/A 5.0 μg/m3 (21) 34.0
 
May 18, 2019, 9 p.m. 26.8 ppb (25) 13.3 ppb (12) N/A 13.0 ppb (12) N/A N/A N/A 0.42 ppb (5) N/A 2.0 μg/m3 (8) 25.0
 
May 18, 2019, 8 p.m. 38.4 ppb (36) 20.0 ppb (19) N/A 18.0 ppb (17) N/A N/A N/A 0.38 ppb (4) N/A 2.0 μg/m3 (8) 36.0
 
May 18, 2019, 7 p.m. 48.9 ppb (45) 27.8 ppb (26) N/A 21.0 ppb (19) N/A N/A N/A 0.39 ppb (4) N/A 3.0 μg/m3 (12) 45.0
 
May 18, 2019, 6 p.m. 52.3 ppb (48) 31.3 ppb (29) N/A 21.0 ppb (19) N/A N/A N/A 0.4 ppb (4) N/A 4.0 μg/m3 (17) 48.0