AQSQID: 530330080

Site Name: Seattle-Beacon Hill

Location: Seattle, WA

Reporting: True, Located: True

Current AQI: 29.0

Seattle WA, US: 47.568236, -122.308628

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 23, 2019, midnight N/A 0.3 ppb (0) 5.7 ppb (5) 6.0 ppb (6) N/A 1.0 ppb (1) 38.0 ppb (29) 0.18 ppb (2) N/A 2.2 μg/m3 (9) 29.0
 
March 22, 2019, 11 p.m. N/A 0.5 ppb (0) 4.9 ppb (5) 5.0 ppb (5) N/A 1.0 ppb (1) 41.0 ppb (32) 0.18 ppb (2) N/A 1.0 μg/m3 (4) 32.0
 
March 22, 2019, 10 p.m. N/A 0.6 ppb (1) 5.7 ppb (5) 5.0 ppb (5) N/A 1.0 ppb (1) 41.0 ppb (32) 0.17 ppb (2) N/A 3.0 μg/m3 (12) 32.0
 
March 22, 2019, 9 p.m. N/A 0.9 ppb (1) 5.5 ppb (5) 4.0 ppb (4) N/A 1.0 ppb (1) 40.0 ppb (31) 0.17 ppb (2) N/A 3.6 μg/m3 (15) 31.0
 
March 22, 2019, 8 p.m. N/A 1.0 ppb (1) 4.8 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (1) 44.0 ppb (34) 0.16 ppb (2) N/A -1.0 μg/m3 (0) 34.0
 
March 22, 2019, 7 p.m. N/A 9.0 ppb (8) 23.2 ppb (21) 14.0 ppb (13) N/A 1.0 ppb (1) 32.0 ppb (25) 0.22 ppb (2) N/A 4.6 μg/m3 (19) 25.0
 
March 22, 2019, 6 p.m. N/A 29.9 ppb (28) 59.8 ppb (56) 31.0 ppb (29) N/A 2.0 ppb (3) 14.0 ppb (11) 0.35 ppb (4) N/A 11.9 μg/m3 (50) 56.0
 
March 22, 2019, 5 p.m. N/A 63.7 ppb (60) 98.4 ppb (97) 36.0 ppb (33) N/A 3.0 ppb (4) 8.0 ppb (6) 0.42 ppb (5) N/A 15.5 μg/m3 (57) 97.0
 
March 22, 2019, 4 p.m. N/A 49.8 ppb (46) 77.5 ppb (75) 28.0 ppb (26) N/A N/A 11.0 ppb (8) 0.46 ppb (5) N/A 12.5 μg/m3 (51) 75.0
 
March 22, 2019, 3 p.m. N/A 24.1 ppb (22) 48.8 ppb (45) 26.0 ppb (24) N/A N/A 10.0 ppb (8) 0.4 ppb (4) N/A 8.9 μg/m3 (37) 45.0
 
March 22, 2019, 2 p.m. N/A 3.8 ppb (4) 29.0 ppb (27) 26.0 ppb (24) N/A N/A 10.0 ppb (8) 0.32 ppb (4) N/A 6.4 μg/m3 (27) 27.0
 
March 22, 2019, 1 p.m. N/A 4.8 ppb (4) 36.9 ppb (34) 34.0 ppb (31) N/A 1.0 ppb (1) 4.0 ppb (3) 0.35 ppb (4) N/A 8.8 μg/m3 (37) 37.0
 
March 22, 2019, noon N/A 19.7 ppb (18) 56.3 ppb (52) 38.0 ppb (35) N/A 1.0 ppb (1) 2.0 ppb (2) 0.38 ppb (4) N/A 8.6 μg/m3 (36) 52.0
 
March 22, 2019, 11 a.m. N/A 0.1 ppb (0) 6.6 ppb (6) 7.0 ppb (6) N/A 1.0 ppb (1) 30.0 ppb (23) 0.2 ppb (2) N/A 3.9 μg/m3 (16) 23.0
 
March 22, 2019, 10 a.m. N/A 0.1 ppb (0) 7.9 ppb (7) 7.0 ppb (6) N/A 1.0 ppb (1) N/A 0.21 ppb (2) N/A 4.5 μg/m3 (19) 19.0
 
March 22, 2019, 9 a.m. N/A 0.1 ppb (0) 10.9 ppb (10) 11.0 ppb (10) N/A 1.0 ppb (1) 28.0 ppb (22) 0.2 ppb (2) N/A 3.8 μg/m3 (16) 22.0
 
March 22, 2019, 8 a.m. N/A 0.0 ppb (0) 4.6 ppb (4) 5.0 ppb (5) N/A 1.0 ppb (1) 38.0 ppb (29) N/A N/A 2.9 μg/m3 (12) 29.0
 
March 22, 2019, 7 a.m. N/A 0.1 ppb (0) 3.2 ppb (3) 3.0 ppb (3) N/A 1.0 ppb (1) 41.0 ppb (32) N/A N/A 1.5 μg/m3 (6) 32.0
 
March 22, 2019, 6 a.m. N/A 0.0 ppb (0) 3.2 ppb (3) 3.0 ppb (3) N/A 1.0 ppb (1) 42.0 ppb (32) 0.17 ppb (2) N/A 1.8 μg/m3 (8) 32.0
 
March 22, 2019, 5 a.m. N/A 0.2 ppb (0) 5.5 ppb (5) 6.0 ppb (6) N/A 1.0 ppb (1) 39.0 ppb (30) 0.18 ppb (2) N/A 1.3 μg/m3 (5) 30.0
 
March 22, 2019, 4 a.m. N/A 0.1 ppb (0) 4.4 ppb (4) 5.0 ppb (5) N/A 1.0 ppb (1) 41.0 ppb (32) 0.21 ppb (2) N/A 1.9 μg/m3 (8) 32.0
 
March 22, 2019, 3 a.m. N/A 0.3 ppb (0) 3.2 ppb (3) 3.0 ppb (3) N/A 1.0 ppb (1) 44.0 ppb (34) 0.17 ppb (2) N/A 1.6 μg/m3 (7) 34.0
 
March 22, 2019, 2 a.m. N/A 0.1 ppb (0) 5.1 ppb (5) 5.0 ppb (5) N/A 1.0 ppb (1) 42.0 ppb (32) 0.17 ppb (2) N/A 1.7 μg/m3 (7) 32.0
 
March 22, 2019, 1 a.m. N/A 0.2 ppb (0) 3.3 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) 0.16 ppb (2) N/A 1.1 μg/m3 (5) 33.0
 
March 22, 2019, midnight N/A N/A 4.2 ppb (4) N/A N/A 1.0 ppb (1) 42.0 ppb (32) 0.17 ppb (2) N/A 3.6 μg/m3 (15) 32.0
 
March 21, 2019, 11 p.m. N/A N/A 3.2 ppb (3) N/A N/A N/A 42.0 ppb (32) 0.17 ppb (2) N/A 0.1 μg/m3 (0) 32.0
 
March 21, 2019, 10 p.m. N/A 0.6 ppb (1) 2.7 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) 43.0 ppb (33) 0.17 ppb (2) N/A 0.1 μg/m3 (0) 33.0
 
March 21, 2019, 9 p.m. N/A 0.7 ppb (1) 3.1 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) 45.0 ppb (35) 0.16 ppb (2) N/A N/A 35.0
 
March 21, 2019, 8 p.m. N/A 0.5 ppb (0) 2.8 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) 45.0 ppb (35) 0.16 ppb (2) N/A 3.7 μg/m3 (15) 35.0
 
March 21, 2019, 7 p.m. N/A 0.8 ppb (1) 3.8 ppb (4) N/A N/A 1.0 ppb (1) 42.0 ppb (32) 0.16 ppb (2) N/A 4.3 μg/m3 (18) 32.0
 
March 21, 2019, 6 p.m. N/A 1.0 ppb (1) 4.6 ppb (4) N/A N/A 1.0 ppb (1) 41.0 ppb (32) 0.2 ppb (2) N/A 6.2 μg/m3 (26) 32.0
 
March 21, 2019, 5 p.m. N/A 1.4 ppb (1) 6.3 ppb (6) 5.0 ppb (5) N/A 1.0 ppb (1) 37.0 ppb (28) 0.27 ppb (3) N/A 6.4 μg/m3 (27) 28.0
 
March 21, 2019, 4 p.m. N/A 1.9 ppb (2) 9.7 ppb (9) 7.0 ppb (6) N/A 1.0 ppb (1) 33.0 ppb (25) 0.3 ppb (3) N/A 6.9 μg/m3 (29) 29.0
 
March 21, 2019, 3 p.m. N/A 3.0 ppb (3) 18.3 ppb (17) 16.0 ppb (15) N/A 1.0 ppb (1) 24.0 ppb (18) 0.27 ppb (3) N/A 7.5 μg/m3 (31) 31.0
 
March 21, 2019, 2 p.m. N/A 0.6 ppb (1) 15.3 ppb (14) 15.0 ppb (14) N/A N/A 25.0 ppb (19) 0.23 ppb (3) N/A 6.6 μg/m3 (28) 28.0
 
March 21, 2019, 1 p.m. N/A 1.1 ppb (1) 19.5 ppb (18) 18.0 ppb (17) N/A N/A 24.0 ppb (18) 0.22 ppb (2) N/A 5.7 μg/m3 (24) 24.0
 
March 21, 2019, noon N/A 0.2 ppb (0) 22.0 ppb (20) 22.0 ppb (20) N/A 1.0 ppb (1) 23.0 ppb (18) 0.24 ppb (3) N/A 5.6 μg/m3 (23) 23.0
 
March 21, 2019, 11 a.m. N/A 0.1 ppb (0) 20.8 ppb (19) 21.0 ppb (19) N/A 1.0 ppb (1) 25.0 ppb (19) 0.22 ppb (2) N/A 6.6 μg/m3 (28) 28.0
 
March 21, 2019, 10 a.m. N/A 0.1 ppb (0) 13.9 ppb (13) 14.0 ppb (13) N/A 1.0 ppb (1) 33.0 ppb (25) 0.19 ppb (2) N/A 3.8 μg/m3 (16) 25.0
 
March 21, 2019, 9 a.m. N/A 0.1 ppb (0) 13.3 ppb (12) 13.0 ppb (12) N/A 1.0 ppb (1) 39.0 ppb (30) 0.19 ppb (2) N/A 2.4 μg/m3 (10) 30.0
 
March 21, 2019, 8 a.m. N/A 0.1 ppb (0) 9.3 ppb (9) 9.0 ppb (8) N/A 1.0 ppb (1) 43.0 ppb (33) 0.18 ppb (2) N/A 7.7 μg/m3 (32) 33.0
 
March 21, 2019, 7 a.m. N/A 0.1 ppb (0) 9.5 ppb (9) 9.0 ppb (8) N/A N/A 44.0 ppb (34) 0.2 ppb (2) N/A 3.6 μg/m3 (15) 34.0
 
March 21, 2019, 6 a.m. N/A 0.1 ppb (0) 14.6 ppb (14) 14.0 ppb (13) N/A N/A 38.0 ppb (29) 0.21 ppb (2) N/A 3.1 μg/m3 (13) 29.0
 
March 21, 2019, 5 a.m. N/A 0.2 ppb (0) 9.1 ppb (8) 9.0 ppb (8) N/A 1.0 ppb (1) 44.0 ppb (34) 0.2 ppb (2) N/A 1.5 μg/m3 (6) 34.0
 
March 21, 2019, 4 a.m. N/A 0.3 ppb (0) 4.6 ppb (4) 4.0 ppb (4) N/A 1.0 ppb (1) 50.0 ppb (38) 0.16 ppb (2) N/A 1.5 μg/m3 (6) 38.0
 
March 21, 2019, 3 a.m. N/A 0.1 ppb (0) 3.0 ppb (3) 3.0 ppb (3) N/A N/A 52.0 ppb (40) 0.17 ppb (2) N/A 2.1 μg/m3 (9) 40.0
 
March 21, 2019, 2 a.m. N/A 0.2 ppb (0) 2.6 ppb (2) 2.0 ppb (2) N/A N/A 53.0 ppb (41) 0.16 ppb (2) N/A 1.0 μg/m3 (4) 41.0
 
March 21, 2019, 1 a.m. N/A 0.2 ppb (0) 2.0 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (1) 52.0 ppb (40) 0.14 ppb (2) N/A 1.8 μg/m3 (8) 40.0
 
March 21, 2019, midnight N/A 0.3 ppb (0) 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) 53.0 ppb (41) 0.15 ppb (2) N/A 2.6 μg/m3 (11) 41.0
 
March 20, 2019, 11 p.m. N/A 0.3 ppb (0) 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) 54.0 ppb (42) 0.15 ppb (2) N/A 0.6 μg/m3 (2) 42.0
 
March 20, 2019, 10 p.m. N/A 0.4 ppb (0) 2.7 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) 52.0 ppb (40) 0.16 ppb (2) N/A 1.1 μg/m3 (5) 40.0
 
March 20, 2019, 9 p.m. N/A 6.7 ppb (6) 22.7 ppb (21) 16.0 ppb (15) N/A 1.0 ppb (1) 36.0 ppb (28) 0.25 ppb (3) N/A 1.3 μg/m3 (5) 28.0
 
March 20, 2019, 8 p.m. N/A 15.7 ppb (15) 39.8 ppb (37) 26.0 ppb (24) N/A 1.0 ppb (1) 24.0 ppb (18) 0.28 ppb (3) N/A 5.5 μg/m3 (23) 37.0
 
March 20, 2019, 7 p.m. N/A 25.2 ppb (23) 53.1 ppb (49) 30.0 ppb (28) N/A 1.0 ppb (1) 18.0 ppb (14) 0.34 ppb (4) N/A 7.8 μg/m3 (32) 49.0
 
March 20, 2019, 6 p.m. N/A 18.1 ppb (17) 43.5 ppb (40) 27.0 ppb (25) N/A 1.0 ppb (1) 20.0 ppb (15) 0.44 ppb (5) N/A 6.7 μg/m3 (28) 40.0
 
March 20, 2019, 5 p.m. N/A 56.3 ppb (52) 91.2 ppb (90) 36.0 ppb (33) N/A 2.0 ppb (3) 9.0 ppb (7) 0.44 ppb (5) N/A 7.3 μg/m3 (30) 90.0
 
March 20, 2019, 4 p.m. N/A 53.7 ppb (50) 89.1 ppb (87) 37.0 ppb (34) N/A 2.0 ppb (3) 8.0 ppb (6) 0.53 ppb (6) N/A 8.0 μg/m3 (33) 87.0
 
March 20, 2019, 3 p.m. N/A 39.1 ppb (36) 74.8 ppb (72) 37.0 ppb (34) N/A 2.0 ppb (3) 7.0 ppb (5) 0.43 ppb (5) N/A 3.0 μg/m3 (12) 72.0
 
March 20, 2019, 2 p.m. N/A 29.5 ppb (27) 69.0 ppb (66) 41.0 ppb (38) N/A 1.0 ppb (1) 3.0 ppb (2) 0.31 ppb (3) N/A 7.8 μg/m3 (32) 66.0
 
March 20, 2019, 1 p.m. N/A 17.8 ppb (16) 59.0 ppb (55) 43.0 ppb (40) N/A 1.0 ppb (1) 3.0 ppb (2) 0.24 ppb (3) N/A 4.3 μg/m3 (18) 55.0
 
March 20, 2019, noon N/A 1.4 ppb (1) 21.7 ppb (20) 21.0 ppb (19) N/A 1.0 ppb (1) 26.0 ppb (20) 0.18 ppb (2) N/A 2.8 μg/m3 (12) 20.0
 
March 20, 2019, 11 a.m. N/A 0.0 ppb (0) 13.6 ppb (13) 13.0 ppb (12) N/A 1.0 ppb (1) 35.0 ppb (27) 0.16 ppb (2) N/A 2.1 μg/m3 (9) 27.0
 
March 20, 2019, 10 a.m. N/A 0.0 ppb (0) 1.9 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (1) N/A 0.14 ppb (2) N/A 2.4 μg/m3 (10) 10.0
 
March 20, 2019, 9 a.m. N/A 0.0 ppb (0) 2.2 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (1) 48.0 ppb (37) 0.15 ppb (2) N/A 0.6 μg/m3 (2) 37.0
 
March 20, 2019, 8 a.m. N/A 0.1 ppb (0) 1.5 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (1) 50.0 ppb (38) N/A N/A 1.6 μg/m3 (7) 38.0
 
March 20, 2019, 7 a.m. N/A 0.1 ppb (0) 1.3 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (1) 51.0 ppb (39) N/A N/A 0.3 μg/m3 (1) 39.0
 
March 20, 2019, 6 a.m. N/A 0.0 ppb (0) 1.2 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (1) 51.0 ppb (39) 0.14 ppb (2) N/A 1.4 μg/m3 (6) 39.0
 
March 20, 2019, 5 a.m. N/A 0.1 ppb (0) 1.8 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) 51.0 ppb (39) 0.15 ppb (2) N/A 1.2 μg/m3 (5) 39.0
 
March 20, 2019, 4 a.m. N/A 0.2 ppb (0) 3.5 ppb (3) 3.0 ppb (3) N/A 1.0 ppb (1) 49.0 ppb (38) 0.18 ppb (2) N/A 0.5 μg/m3 (2) 38.0
 
March 20, 2019, 3 a.m. N/A 0.3 ppb (0) 4.8 ppb (4) 4.0 ppb (4) N/A 1.0 ppb (1) 48.0 ppb (37) 0.17 ppb (2) N/A 2.4 μg/m3 (10) 37.0
 
March 20, 2019, 2 a.m. N/A 0.3 ppb (0) 6.3 ppb (6) 5.0 ppb (5) N/A 1.0 ppb (1) 47.0 ppb (36) 0.21 ppb (2) N/A 1.2 μg/m3 (5) 36.0
 
March 20, 2019, 1 a.m. N/A 0.5 ppb (0) 5.2 ppb (5) 4.0 ppb (4) N/A 1.0 ppb (1) 48.0 ppb (37) 0.2 ppb (2) N/A 0.6 μg/m3 (2) 37.0
 
March 20, 2019, midnight N/A 0.4 ppb (0) 3.0 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) 51.0 ppb (39) 0.17 ppb (2) N/A 2.3 μg/m3 (10) 39.0
 
March 19, 2019, 11 p.m. N/A 0.3 ppb (0) 2.1 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) 52.0 ppb (40) 0.16 ppb (2) N/A 1.8 μg/m3 (8) 40.0
 
March 19, 2019, 10 p.m. N/A 0.3 ppb (0) 2.2 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) 52.0 ppb (40) 0.17 ppb (2) N/A 1.3 μg/m3 (5) 40.0
 
March 19, 2019, 9 p.m. N/A 0.4 ppb (0) 2.1 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) 52.0 ppb (40) 0.16 ppb (2) N/A 0.5 μg/m3 (2) 40.0
 
March 19, 2019, 8 p.m. N/A 0.3 ppb (0) 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) 52.0 ppb (40) 0.15 ppb (2) N/A 2.6 μg/m3 (11) 40.0
 
March 19, 2019, 7 p.m. N/A 0.3 ppb (0) 2.0 ppb (2) N/A N/A 1.0 ppb (1) 52.0 ppb (40) 0.15 ppb (2) N/A -0.1 μg/m3 (0) 40.0
 
March 19, 2019, 6 p.m. N/A 28.1 ppb (26) 58.0 ppb (54) N/A N/A 1.0 ppb (1) 20.0 ppb (15) 0.35 ppb (4) N/A 5.5 μg/m3 (23) 54.0
 
March 19, 2019, 5 p.m. N/A 26.2 ppb (24) 56.3 ppb (52) 32.0 ppb (30) N/A 2.0 ppb (3) 16.0 ppb (12) 0.33 ppb (4) N/A 5.5 μg/m3 (23) 52.0
 
March 19, 2019, 4 p.m. N/A 50.7 ppb (47) 86.3 ppb (84) 37.0 ppb (34) N/A 2.0 ppb (3) 9.0 ppb (7) 0.39 ppb (4) N/A 11.6 μg/m3 (48) 84.0
 
March 19, 2019, 3 p.m. N/A 54.7 ppb (51) 93.4 ppb (92) 40.0 ppb (37) N/A 2.0 ppb (3) 11.0 ppb (8) 0.48 ppb (5) N/A 5.8 μg/m3 (24) 92.0
 
March 19, 2019, 2 p.m. N/A 9.9 ppb (9) 24.8 ppb (23) 15.0 ppb (14) N/A 1.0 ppb (1) 36.0 ppb (28) 0.25 ppb (3) N/A 2.6 μg/m3 (11) 28.0
 
March 19, 2019, 1 p.m. N/A 0.5 ppb (0) 7.8 ppb (7) 5.0 ppb (5) N/A 1.0 ppb (1) 45.0 ppb (35) 0.17 ppb (2) N/A 2.0 μg/m3 (8) 35.0
 
March 19, 2019, noon N/A 0.1 ppb (0) 4.1 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (1) 47.0 ppb (36) 0.16 ppb (2) N/A 2.0 μg/m3 (8) 36.0
 
March 19, 2019, 11 a.m. N/A 0.0 ppb (0) 1.6 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (1) 51.0 ppb (39) 0.14 ppb (2) N/A 0.7 μg/m3 (3) 39.0
 
March 19, 2019, 10 a.m. N/A 0.1 ppb (0) 2.9 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) 51.0 ppb (39) 0.15 ppb (2) N/A 2.4 μg/m3 (10) 39.0
 
March 19, 2019, 9 a.m. N/A 0.0 ppb (0) 1.5 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (1) 52.0 ppb (40) 0.14 ppb (2) N/A 1.2 μg/m3 (5) 40.0
 
March 19, 2019, 8 a.m. N/A 0.0 ppb (0) 1.9 ppb (2) 2.0 ppb (2) N/A 1.0 ppb (1) 51.0 ppb (39) 0.15 ppb (2) N/A 2.0 μg/m3 (8) 39.0
 
March 19, 2019, 7 a.m. N/A 0.0 ppb (0) 3.9 ppb (4) 3.0 ppb (3) N/A N/A 46.0 ppb (35) 0.18 ppb (2) N/A 1.6 μg/m3 (7) 35.0
 
March 19, 2019, 6 a.m. N/A 0.1 ppb (0) 3.2 ppb (3) 3.0 ppb (3) N/A N/A 47.0 ppb (36) 0.16 ppb (2) N/A 2.0 μg/m3 (8) 36.0
 
March 19, 2019, 5 a.m. N/A 0.1 ppb (0) 3.1 ppb (3) 3.0 ppb (3) N/A 1.0 ppb (1) 49.0 ppb (38) 0.15 ppb (2) N/A 2.2 μg/m3 (9) 38.0
 
March 19, 2019, 4 a.m. N/A 0.1 ppb (0) 4.5 ppb (4) 4.0 ppb (4) N/A 1.0 ppb (1) 47.0 ppb (36) 0.17 ppb (2) N/A 1.5 μg/m3 (6) 36.0
 
March 19, 2019, 3 a.m. N/A 0.1 ppb (0) 2.7 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) 50.0 ppb (38) 0.16 ppb (2) N/A 2.0 μg/m3 (8) 38.0
 
March 19, 2019, 2 a.m. N/A 0.1 ppb (0) 3.4 ppb (3) 3.0 ppb (3) N/A 1.0 ppb (1) 50.0 ppb (38) 0.16 ppb (2) N/A 1.2 μg/m3 (5) 38.0
 
March 19, 2019, 1 a.m. N/A 0.3 ppb (0) 3.7 ppb (3) 3.0 ppb (3) N/A 1.0 ppb (1) 49.0 ppb (38) 0.16 ppb (2) N/A 2.4 μg/m3 (10) 38.0
 
March 19, 2019, midnight N/A N/A 23.6 ppb (22) N/A N/A 1.0 ppb (1) N/A 0.23 ppb (3) N/A 4.9 μg/m3 (20) 22.0
 
March 18, 2019, 11 p.m. N/A 11.0 ppb (10) 34.8 ppb (32) 25.0 ppb (23) N/A 1.0 ppb (1) N/A 0.28 ppb (3) N/A 6.2 μg/m3 (26) 32.0
 
March 18, 2019, 10 p.m. N/A 12.9 ppb (12) 35.9 ppb (33) 24.0 ppb (22) N/A 1.0 ppb (1) N/A 0.27 ppb (3) N/A 5.6 μg/m3 (23) 33.0
 
March 18, 2019, 9 p.m. N/A 7.4 ppb (7) 22.1 ppb (20) 16.0 ppb (15) N/A 1.0 ppb (1) N/A 0.24 ppb (3) N/A 4.1 μg/m3 (17) 20.0
 
March 18, 2019, 8 p.m. N/A 1.3 ppb (1) 6.1 ppb (6) 4.0 ppb (4) N/A 1.0 ppb (1) N/A 0.18 ppb (2) N/A 3.2 μg/m3 (13) 13.0
 
March 18, 2019, 7 p.m. N/A 12.8 ppb (12) 26.7 ppb (25) 14.0 ppb (13) N/A 1.0 ppb (1) N/A 0.26 ppb (3) N/A 3.6 μg/m3 (15) 25.0
 
March 18, 2019, 6 p.m. N/A 18.8 ppb (17) 37.4 ppb (35) 20.0 ppb (19) N/A 1.0 ppb (1) N/A 0.28 ppb (3) N/A 3.8 μg/m3 (16) 35.0
 
March 18, 2019, 5 p.m. N/A 13.0 ppb (12) 28.4 ppb (26) 16.0 ppb (15) N/A 1.0 ppb (1) N/A 0.29 ppb (3) N/A 4.0 μg/m3 (17) 26.0
 
March 18, 2019, 4 p.m. N/A 5.2 ppb (5) 16.1 ppb (15) 11.0 ppb (10) N/A 1.0 ppb (1) N/A 0.25 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
March 18, 2019, 3 p.m. N/A 3.9 ppb (4) 16.7 ppb (15) 13.0 ppb (12) N/A 1.0 ppb (1) N/A 0.26 ppb (3) N/A 4.1 μg/m3 (17) 17.0
 
March 18, 2019, 2 p.m. N/A 2.1 ppb (2) 22.1 ppb (20) 20.0 ppb (19) N/A 1.0 ppb (1) N/A 0.28 ppb (3) N/A 4.3 μg/m3 (18) 20.0
 
March 18, 2019, 1 p.m. N/A 0.2 ppb (0) 11.9 ppb (11) 12.0 ppb (11) N/A 1.0 ppb (1) N/A 0.22 ppb (2) N/A 3.8 μg/m3 (16) 16.0
 
March 18, 2019, noon N/A 0.1 ppb (0) 8.5 ppb (8) 8.0 ppb (7) N/A 1.0 ppb (1) N/A 0.2 ppb (2) N/A 4.8 μg/m3 (20) 20.0
 
March 18, 2019, 11 a.m. N/A 0.1 ppb (0) 7.1 ppb (7) 6.0 ppb (6) N/A 1.0 ppb (1) N/A 0.19 ppb (2) N/A 5.2 μg/m3 (22) 22.0
 
March 18, 2019, 10 a.m. N/A 0.1 ppb (0) 7.9 ppb (7) 7.0 ppb (6) N/A 1.0 ppb (1) N/A 0.2 ppb (2) N/A 5.2 μg/m3 (22) 22.0
 
March 18, 2019, 9 a.m. N/A 0.1 ppb (0) 8.4 ppb (8) 7.0 ppb (6) N/A 1.0 ppb (1) N/A 0.19 ppb (2) N/A 4.7 μg/m3 (20) 20.0
 
March 18, 2019, 8 a.m. N/A 0.3 ppb (0) 11.7 ppb (11) 10.0 ppb (9) N/A 1.0 ppb (1) N/A N/A N/A 5.7 μg/m3 (24) 24.0
 
March 18, 2019, 7 a.m. N/A 0.2 ppb (0) 12.9 ppb (12) 12.0 ppb (11) N/A 1.0 ppb (1) N/A N/A N/A 6.4 μg/m3 (27) 27.0
 
March 18, 2019, 6 a.m. N/A 4.0 ppb (4) 33.0 ppb (31) 29.0 ppb (27) N/A 1.0 ppb (1) N/A 0.3 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
March 18, 2019, 5 a.m. N/A 0.2 ppb (0) 15.6 ppb (14) 14.0 ppb (13) N/A 1.0 ppb (1) N/A 0.28 ppb (3) N/A 9.3 μg/m3 (39) 39.0
 
March 18, 2019, 4 a.m. N/A 0.4 ppb (0) 13.3 ppb (12) 12.0 ppb (11) N/A 1.0 ppb (1) N/A 0.26 ppb (3) N/A 7.5 μg/m3 (31) 31.0
 
March 18, 2019, 3 a.m. N/A 0.3 ppb (0) 15.6 ppb (14) 15.0 ppb (14) N/A 1.0 ppb (1) N/A 0.3 ppb (3) N/A 9.9 μg/m3 (41) 41.0
 
March 18, 2019, 2 a.m. N/A 0.4 ppb (0) 17.7 ppb (16) 17.0 ppb (16) N/A 1.0 ppb (1) N/A 0.31 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 18, 2019, 1 a.m. N/A 2.2 ppb (2) 19.0 ppb (18) 17.0 ppb (16) N/A 1.0 ppb (1) N/A 0.28 ppb (3) N/A 6.8 μg/m3 (28) 28.0
 
March 18, 2019, midnight N/A 2.6 ppb (2) 13.0 ppb (12) 10.0 ppb (9) N/A 1.0 ppb (1) N/A 0.25 ppb (3) N/A 5.5 μg/m3 (23) 23.0
 
March 17, 2019, 11 p.m. N/A 2.2 ppb (2) 9.6 ppb (9) 7.0 ppb (6) N/A 1.0 ppb (1) N/A 0.23 ppb (3) N/A 4.3 μg/m3 (18) 18.0
 
March 17, 2019, 10 p.m. N/A 3.1 ppb (3) 10.4 ppb (10) 7.0 ppb (6) N/A 1.0 ppb (1) N/A 0.24 ppb (3) N/A 6.4 μg/m3 (27) 27.0
 
March 17, 2019, 9 p.m. N/A 3.5 ppb (3) 10.4 ppb (10) 7.0 ppb (6) N/A 1.0 ppb (1) N/A 0.22 ppb (2) N/A 5.2 μg/m3 (22) 22.0
 
March 17, 2019, 8 p.m. N/A 4.4 ppb (4) 12.0 ppb (11) 7.0 ppb (6) N/A 1.0 ppb (1) N/A 0.22 ppb (2) N/A 5.2 μg/m3 (22) 22.0
 
March 17, 2019, 7 p.m. N/A 4.6 ppb (4) 12.7 ppb (12) 8.0 ppb (7) N/A 1.0 ppb (1) 26.0 ppb (20) 0.23 ppb (3) N/A 6.3 μg/m3 (26) 26.0
 
March 17, 2019, 6 p.m. N/A 4.3 ppb (4) 11.8 ppb (11) 7.0 ppb (6) N/A 1.0 ppb (1) 23.0 ppb (18) 0.24 ppb (3) N/A 4.9 μg/m3 (20) 20.0
 
March 17, 2019, 5 p.m. N/A 2.7 ppb (3) 8.3 ppb (8) 5.0 ppb (5) N/A 1.0 ppb (1) 24.0 ppb (18) 0.22 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 17, 2019, 4 p.m. N/A 2.6 ppb (2) 9.2 ppb (9) 6.0 ppb (6) N/A 1.0 ppb (1) 21.0 ppb (16) 0.22 ppb (2) N/A 7.7 μg/m3 (32) 32.0
 
March 17, 2019, 3 p.m. N/A 2.6 ppb (2) 12.2 ppb (11) 9.0 ppb (8) N/A 1.0 ppb (1) 15.0 ppb (12) 0.25 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 17, 2019, 2 p.m. N/A 1.0 ppb (1) 16.8 ppb (16) 15.0 ppb (14) N/A 1.0 ppb (1) 12.0 ppb (9) 0.26 ppb (3) N/A 9.4 μg/m3 (39) 39.0
 
March 17, 2019, 1 p.m. N/A 0.2 ppb (0) 11.8 ppb (11) 10.0 ppb (9) N/A N/A 16.0 ppb (12) 0.25 ppb (3) N/A 10.4 μg/m3 (43) 43.0
 
March 17, 2019, noon N/A 0.2 ppb (0) 11.1 ppb (10) 10.0 ppb (9) N/A N/A 15.0 ppb (12) 0.25 ppb (3) N/A 8.6 μg/m3 (36) 36.0
 
March 17, 2019, 11 a.m. N/A 0.1 ppb (0) 12.9 ppb (12) 12.0 ppb (11) N/A 2.0 ppb (3) 18.0 ppb (14) 0.25 ppb (3) N/A 8.5 μg/m3 (35) 35.0
 
March 17, 2019, 10 a.m. N/A 0.1 ppb (0) 15.5 ppb (14) 14.0 ppb (13) N/A 2.0 ppb (3) 17.0 ppb (13) 0.28 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
March 17, 2019, 9 a.m. N/A 0.2 ppb (0) 13.5 ppb (12) 12.0 ppb (11) N/A 1.0 ppb (1) 19.0 ppb (15) 0.27 ppb (3) N/A 10.8 μg/m3 (45) 45.0
 
March 17, 2019, 8 a.m. N/A 0.3 ppb (0) 15.5 ppb (14) 13.0 ppb (12) N/A 1.0 ppb (1) 17.0 ppb (13) 0.3 ppb (3) N/A 13.4 μg/m3 (53) 53.0
 
March 17, 2019, 7 a.m. N/A 0.2 ppb (0) 16.5 ppb (15) 15.0 ppb (14) N/A N/A 17.0 ppb (13) 0.33 ppb (4) N/A 12.3 μg/m3 (51) 51.0
 
March 17, 2019, 6 a.m. N/A 0.6 ppb (1) 17.8 ppb (16) 15.0 ppb (14) N/A N/A 17.0 ppb (13) 0.33 ppb (4) N/A 10.9 μg/m3 (45) 45.0
 
March 17, 2019, 5 a.m. N/A 1.4 ppb (1) 26.6 ppb (25) 24.0 ppb (22) N/A 1.0 ppb (1) 11.0 ppb (8) 0.38 ppb (4) N/A 13.9 μg/m3 (54) 54.0
 
March 17, 2019, 4 a.m. N/A 4.5 ppb (4) 40.0 ppb (37) 36.0 ppb (33) N/A 1.0 ppb (1) 4.0 ppb (3) 0.37 ppb (4) N/A 9.8 μg/m3 (41) 41.0
 
March 17, 2019, 3 a.m. N/A 0.3 ppb (0) 21.6 ppb (20) 21.0 ppb (19) N/A 1.0 ppb (1) 21.0 ppb (16) 0.37 ppb (4) N/A 8.3 μg/m3 (35) 35.0
 
March 17, 2019, 2 a.m. N/A 0.4 ppb (0) 20.1 ppb (19) 20.0 ppb (19) N/A 1.0 ppb (1) 22.0 ppb (17) 0.28 ppb (3) N/A 5.3 μg/m3 (22) 22.0
 
March 17, 2019, 1 a.m. N/A 1.8 ppb (2) 18.9 ppb (18) 18.0 ppb (17) N/A N/A 22.0 ppb (17) 0.26 ppb (3) N/A 5.3 μg/m3 (22) 22.0
 
March 17, 2019, midnight N/A 1.8 ppb (2) 13.8 ppb (13) 12.0 ppb (11) N/A N/A 32.0 ppb (25) 0.21 ppb (2) N/A 4.4 μg/m3 (18) 25.0
 
March 16, 2019, 11 p.m. N/A 2.9 ppb (3) 13.6 ppb (13) 11.0 ppb (10) N/A N/A 33.0 ppb (25) 0.2 ppb (2) N/A 3.9 μg/m3 (16) 25.0
 
March 16, 2019, 10 p.m. N/A 3.3 ppb (3) 12.1 ppb (11) 8.0 ppb (7) N/A 1.0 ppb (1) 34.0 ppb (26) 0.22 ppb (2) N/A 4.4 μg/m3 (18) 26.0
 
March 16, 2019, 9 p.m. N/A 5.8 ppb (5) 18.2 ppb (17) 12.0 ppb (11) N/A 1.0 ppb (1) 30.0 ppb (23) 0.23 ppb (3) N/A 5.5 μg/m3 (23) 23.0
 
March 16, 2019, 8 p.m. N/A 6.0 ppb (6) 18.8 ppb (17) 13.0 ppb (12) N/A 1.0 ppb (1) 27.0 ppb (21) 0.26 ppb (3) N/A 8.8 μg/m3 (37) 37.0
 
March 16, 2019, 7 p.m. N/A 13.5 ppb (12) 30.9 ppb (29) 17.0 ppb (16) N/A 1.0 ppb (1) 18.0 ppb (14) 0.3 ppb (3) N/A 10.1 μg/m3 (42) 42.0
 
March 16, 2019, 6 p.m. N/A 27.2 ppb (25) 49.4 ppb (46) 22.0 ppb (20) N/A 1.0 ppb (1) 12.0 ppb (9) 0.37 ppb (4) N/A 11.6 μg/m3 (48) 48.0
 
March 16, 2019, 5 p.m. N/A 26.5 ppb (25) 50.1 ppb (46) 24.0 ppb (22) N/A 1.0 ppb (1) 9.0 ppb (7) 0.39 ppb (4) N/A 12.6 μg/m3 (51) 51.0
 
March 16, 2019, 4 p.m. N/A 9.6 ppb (9) 24.7 ppb (23) 15.0 ppb (14) N/A 1.0 ppb (1) 14.0 ppb (11) 0.32 ppb (4) N/A 6.7 μg/m3 (28) 28.0
 
March 16, 2019, 3 p.m. N/A 3.4 ppb (3) 16.4 ppb (15) 13.0 ppb (12) N/A 1.0 ppb (1) 11.0 ppb (8) 0.29 ppb (3) N/A 8.4 μg/m3 (35) 35.0
 
March 16, 2019, 2 p.m. N/A 1.4 ppb (1) 16.9 ppb (16) 15.0 ppb (14) N/A 1.0 ppb (1) 9.0 ppb (7) 0.3 ppb (3) N/A 10.9 μg/m3 (45) 45.0
 
March 16, 2019, 1 p.m. N/A 0.4 ppb (0) 14.8 ppb (14) 14.0 ppb (13) N/A 1.0 ppb (1) 9.0 ppb (7) 0.29 ppb (3) N/A 10.1 μg/m3 (42) 42.0
 
March 16, 2019, noon N/A 0.6 ppb (1) 16.3 ppb (15) 15.0 ppb (14) N/A 1.0 ppb (1) 11.0 ppb (8) 0.29 ppb (3) N/A 9.1 μg/m3 (38) 38.0
 
March 16, 2019, 11 a.m. N/A 0.2 ppb (0) 14.3 ppb (13) 13.0 ppb (12) N/A 1.0 ppb (1) 16.0 ppb (12) 0.27 ppb (3) N/A 8.6 μg/m3 (36) 36.0
 
March 16, 2019, 10 a.m. N/A 0.0 ppb (0) 11.4 ppb (11) 10.0 ppb (9) N/A 1.0 ppb (1) N/A 0.26 ppb (3) N/A 7.1 μg/m3 (30) 30.0
 
March 16, 2019, 9 a.m. N/A 0.2 ppb (0) 13.8 ppb (13) 12.0 ppb (11) N/A 1.0 ppb (1) 19.0 ppb (15) 0.29 ppb (3) N/A 8.7 μg/m3 (36) 36.0
 
March 16, 2019, 8 a.m. N/A 0.3 ppb (0) 17.6 ppb (16) 16.0 ppb (15) N/A 1.0 ppb (1) 17.0 ppb (13) N/A N/A 9.5 μg/m3 (40) 40.0
 
March 16, 2019, 7 a.m. N/A 2.8 ppb (3) 26.1 ppb (24) 23.0 ppb (21) N/A 1.0 ppb (1) 13.0 ppb (10) N/A N/A 8.9 μg/m3 (37) 37.0
 
March 16, 2019, 6 a.m. N/A 0.1 ppb (0) 15.6 ppb (14) 15.0 ppb (14) N/A 1.0 ppb (1) 21.0 ppb (16) 0.29 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 16, 2019, 5 a.m. N/A 0.2 ppb (0) 16.9 ppb (16) 16.0 ppb (15) N/A 1.0 ppb (1) 20.0 ppb (15) 0.33 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
March 16, 2019, 4 a.m. N/A 0.4 ppb (0) 16.0 ppb (15) 14.0 ppb (13) N/A 1.0 ppb (1) 23.0 ppb (18) 0.29 ppb (3) N/A 6.4 μg/m3 (27) 27.0
 
March 16, 2019, 3 a.m. N/A 0.2 ppb (0) 13.3 ppb (12) 13.0 ppb (12) N/A 1.0 ppb (1) 27.0 ppb (21) 0.27 ppb (3) N/A 7.8 μg/m3 (32) 32.0
 
March 16, 2019, 2 a.m. N/A 0.1 ppb (0) 11.4 ppb (11) 11.0 ppb (10) N/A 1.0 ppb (1) 29.0 ppb (22) 0.26 ppb (3) N/A 5.5 μg/m3 (23) 23.0
 
March 16, 2019, 1 a.m. N/A 1.0 ppb (1) 12.3 ppb (11) 11.0 ppb (10) N/A 1.0 ppb (1) 31.0 ppb (24) 0.24 ppb (3) N/A 5.4 μg/m3 (23) 24.0