AQSQID: 060811001

Site Name: Redwood City

Location: San Mateo Co, CA

Reporting: True, Located: True

Current AQI: 17.0

San Mateo Co CA, US: 37.4828, -122.2022

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 24, 2019, 8 a.m. 4.4 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A 21.0 ppb (16) 0.34 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
March 24, 2019, 7 a.m. 3.8 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A 21.0 ppb (16) 0.35 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 24, 2019, 6 a.m. 8.6 ppb (8) 0.3 ppb (0) N/A 8.0 ppb (7) N/A N/A 18.0 ppb (14) 0.41 ppb (5) N/A 18.0 μg/m3 (63) 63.0
 
March 24, 2019, 5 a.m. 8.4 ppb (8) 0.2 ppb (0) N/A 8.0 ppb (7) N/A N/A 26.0 ppb (20) 0.42 ppb (5) N/A N/A 20.0
 
March 24, 2019, 4 a.m. 4.3 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A 42.0 ppb (32) 0.36 ppb (4) N/A 18.0 μg/m3 (63) 63.0
 
March 24, 2019, 3 a.m. 2.7 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A 46.0 ppb (35) 0.33 ppb (4) N/A -3.0 μg/m3 (0) 35.0
 
March 24, 2019, 2 a.m. 2.6 ppb (2) 0.1 ppb (0) N/A 3.0 ppb (3) N/A N/A 45.0 ppb (35) 0.34 ppb (4) N/A 3.0 μg/m3 (12) 35.0
 
March 24, 2019, 1 a.m. 1.8 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A 47.0 ppb (36) 0.31 ppb (3) N/A 3.0 μg/m3 (12) 36.0
 
March 24, 2019, midnight 1.6 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A N/A 49.0 ppb (38) 0.3 ppb (3) N/A 4.0 μg/m3 (17) 38.0
 
March 23, 2019, 11 p.m. 1.7 ppb (2) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A 48.0 ppb (37) 0.31 ppb (3) N/A 7.0 μg/m3 (29) 37.0
 
March 23, 2019, 10 p.m. 1.9 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 48.0 ppb (37) 0.33 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
March 23, 2019, 9 p.m. 1.7 ppb (2) 0.3 ppb (0) N/A 1.0 ppb (1) N/A N/A 47.0 ppb (36) 0.31 ppb (3) N/A 23.0 μg/m3 (73) 73.0
 
March 23, 2019, 8 p.m. 2.4 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A 48.0 ppb (37) 0.32 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
March 23, 2019, 7 p.m. 2.9 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A 48.0 ppb (37) 0.33 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
March 23, 2019, 6 p.m. 3.2 ppb (3) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 47.0 ppb (36) 0.33 ppb (4) N/A 6.0 μg/m3 (25) 36.0
 
March 23, 2019, 5 p.m. 3.2 ppb (3) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 45.0 ppb (35) 0.33 ppb (4) N/A 5.0 μg/m3 (21) 35.0
 
March 23, 2019, 4 p.m. 4.8 ppb (4) 0.9 ppb (1) N/A 4.0 ppb (4) N/A N/A 42.0 ppb (32) 0.36 ppb (4) N/A 5.0 μg/m3 (21) 32.0
 
March 23, 2019, 3 p.m. 8.5 ppb (8) 1.1 ppb (1) N/A 7.0 ppb (6) N/A N/A 39.0 ppb (30) 0.38 ppb (4) N/A 5.0 μg/m3 (21) 30.0
 
March 23, 2019, 2 p.m. 8.3 ppb (8) 0.3 ppb (0) N/A 8.0 ppb (7) N/A N/A 37.0 ppb (28) 0.39 ppb (4) N/A 3.0 μg/m3 (12) 28.0
 
March 23, 2019, 1 p.m. 7.5 ppb (7) 0.3 ppb (0) N/A 7.0 ppb (6) N/A N/A 29.0 ppb (22) 0.38 ppb (4) N/A 4.0 μg/m3 (17) 22.0
 
March 23, 2019, noon 6.3 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A 21.0 ppb (16) 0.38 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
March 23, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 23, 2019, 10 a.m. 4.6 ppb (4) 0.2 ppb (0) N/A 5.0 ppb (5) N/A N/A 28.0 ppb (22) 0.38 ppb (4) N/A 1.0 μg/m3 (4) 22.0
 
March 23, 2019, 9 a.m. 5.2 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A N/A 27.0 ppb (21) 0.38 ppb (4) N/A -1.0 μg/m3 (0) 21.0
 
March 23, 2019, 8 a.m. 4.6 ppb (4) 0.1 ppb (0) N/A 5.0 ppb (5) N/A N/A 28.0 ppb (22) 0.38 ppb (4) N/A 17.0 μg/m3 (61) 61.0
 
March 23, 2019, 7 a.m. 5.9 ppb (5) 0.2 ppb (0) N/A 6.0 ppb (6) N/A N/A 25.0 ppb (19) 0.4 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 23, 2019, 6 a.m. 8.9 ppb (8) 0.6 ppb (1) N/A 8.0 ppb (7) N/A N/A 25.0 ppb (19) 0.39 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 23, 2019, 5 a.m. 11.7 ppb (11) 0.4 ppb (0) N/A 11.0 ppb (10) N/A N/A 22.0 ppb (17) 0.42 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
March 23, 2019, 4 a.m. 12.4 ppb (11) 0.7 ppb (1) N/A 12.0 ppb (11) N/A N/A 23.0 ppb (18) 0.42 ppb (5) N/A 2.0 μg/m3 (8) 18.0
 
March 23, 2019, 3 a.m. 8.8 ppb (8) 0.5 ppb (0) N/A 8.0 ppb (7) N/A N/A 26.0 ppb (20) 0.41 ppb (5) N/A 2.0 μg/m3 (8) 20.0
 
March 23, 2019, 2 a.m. 9.4 ppb (9) 0.6 ppb (1) N/A 9.0 ppb (8) N/A N/A 27.0 ppb (21) 0.43 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
March 23, 2019, 1 a.m. 11.5 ppb (11) 1.2 ppb (1) N/A 10.0 ppb (9) N/A N/A 27.0 ppb (21) 0.45 ppb (5) N/A 4.0 μg/m3 (17) 21.0
 
March 23, 2019, midnight 9.5 ppb (9) 1.5 ppb (1) N/A 8.0 ppb (7) N/A N/A 30.0 ppb (23) 0.43 ppb (5) N/A -1.0 μg/m3 (0) 23.0
 
March 22, 2019, 11 p.m. 5.3 ppb (5) 1.2 ppb (1) N/A 4.0 ppb (4) N/A N/A 36.0 ppb (28) 0.39 ppb (4) N/A 0.0 μg/m3 (0) 28.0
 
March 22, 2019, 10 p.m. 5.1 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 35.0 ppb (27) 0.38 ppb (4) N/A 2.0 μg/m3 (8) 27.0
 
March 22, 2019, 9 p.m. 4.5 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 37.0 ppb (28) 0.36 ppb (4) N/A 3.0 μg/m3 (12) 28.0
 
March 22, 2019, 8 p.m. 6.9 ppb (6) 1.7 ppb (2) N/A 5.0 ppb (5) N/A N/A 36.0 ppb (28) 0.38 ppb (4) N/A 6.0 μg/m3 (25) 28.0
 
March 22, 2019, 7 p.m. 6.8 ppb (6) 1.2 ppb (1) N/A 6.0 ppb (6) N/A N/A 37.0 ppb (28) 0.38 ppb (4) N/A 6.0 μg/m3 (25) 28.0
 
March 22, 2019, 6 p.m. 11.6 ppb (11) 3.1 ppb (3) N/A 9.0 ppb (8) N/A N/A 31.0 ppb (24) 0.42 ppb (5) N/A 5.0 μg/m3 (21) 24.0
 
March 22, 2019, 5 p.m. 21.6 ppb (20) 7.5 ppb (7) N/A 14.0 ppb (13) N/A N/A 20.0 ppb (15) 0.51 ppb (6) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2019, 4 p.m. 27.8 ppb (26) 8.7 ppb (8) N/A 19.0 ppb (18) N/A N/A 12.0 ppb (9) 0.51 ppb (6) N/A 3.0 μg/m3 (12) 26.0
 
March 22, 2019, 3 p.m. 32.0 ppb (30) 10.6 ppb (10) N/A 21.0 ppb (19) N/A N/A 9.0 ppb (7) 0.67 ppb (7) N/A 1.0 μg/m3 (4) 30.0
 
March 22, 2019, 2 p.m. 26.2 ppb (24) 6.9 ppb (6) N/A 19.0 ppb (18) N/A N/A 10.0 ppb (8) 0.55 ppb (6) N/A 2.0 μg/m3 (8) 24.0
 
March 22, 2019, 1 p.m. 27.4 ppb (25) 8.6 ppb (8) N/A 19.0 ppb (18) N/A N/A 13.0 ppb (10) 0.39 ppb (4) N/A 4.0 μg/m3 (17) 25.0
 
March 22, 2019, noon 18.5 ppb (17) 0.6 ppb (1) N/A 18.0 ppb (17) N/A N/A 11.0 ppb (8) 0.37 ppb (4) N/A 2.0 μg/m3 (8) 17.0
 
March 22, 2019, 11 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
March 22, 2019, 10 a.m. 4.5 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A N/A 22.0 ppb (17) 0.34 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
March 22, 2019, 9 a.m. 14.3 ppb (13) 3.2 ppb (3) N/A 11.0 ppb (10) N/A N/A 14.0 ppb (11) 0.34 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 22, 2019, 8 a.m. 8.7 ppb (8) 0.3 ppb (0) N/A 8.0 ppb (7) N/A N/A 17.0 ppb (13) 0.34 ppb (4) N/A 3.0 μg/m3 (12) 13.0
 
March 22, 2019, 7 a.m. 10.1 ppb (9) 0.1 ppb (0) N/A 10.0 ppb (9) N/A N/A 17.0 ppb (13) 0.41 ppb (5) N/A 3.0 μg/m3 (12) 13.0
 
March 22, 2019, 6 a.m. 14.8 ppb (14) 0.5 ppb (0) N/A 14.0 ppb (13) N/A N/A 13.0 ppb (10) 0.48 ppb (5) N/A 18.0 μg/m3 (63) 63.0
 
March 22, 2019, 5 a.m. 14.7 ppb (14) 0.8 ppb (1) N/A 14.0 ppb (13) N/A N/A 15.0 ppb (12) 0.51 ppb (6) N/A -3.0 μg/m3 (0) 14.0
 
March 22, 2019, 4 a.m. 14.7 ppb (14) 0.6 ppb (1) N/A 14.0 ppb (13) N/A N/A 22.0 ppb (17) 0.44 ppb (5) N/A -2.0 μg/m3 (0) 17.0
 
March 22, 2019, 3 a.m. 7.6 ppb (7) 0.3 ppb (0) N/A 7.0 ppb (6) N/A N/A 37.0 ppb (28) 0.37 ppb (4) N/A N/A 28.0
 
March 22, 2019, 2 a.m. 3.7 ppb (3) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A 43.0 ppb (33) 0.34 ppb (4) N/A 0.0 μg/m3 (0) 33.0
 
March 22, 2019, 1 a.m. 2.3 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A 44.0 ppb (34) 0.32 ppb (4) N/A 3.0 μg/m3 (12) 34.0
 
March 22, 2019, midnight 3.5 ppb (3) 0.7 ppb (1) N/A 3.0 ppb (3) N/A N/A 44.0 ppb (34) 0.34 ppb (4) N/A 4.0 μg/m3 (17) 34.0
 
March 21, 2019, 11 p.m. 2.9 ppb (3) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A 46.0 ppb (35) 0.32 ppb (4) N/A 5.0 μg/m3 (21) 35.0
 
March 21, 2019, 10 p.m. 7.3 ppb (7) 1.6 ppb (1) N/A 6.0 ppb (6) N/A N/A 45.0 ppb (35) 0.36 ppb (4) N/A 7.0 μg/m3 (29) 35.0
 
March 21, 2019, 9 p.m. 11.3 ppb (10) 2.7 ppb (3) N/A 9.0 ppb (8) N/A N/A 41.0 ppb (32) 0.4 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
March 21, 2019, 8 p.m. 7.4 ppb (7) 1.9 ppb (2) N/A 6.0 ppb (6) N/A N/A 44.0 ppb (34) 0.33 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
March 21, 2019, 7 p.m. 7.3 ppb (7) 1.8 ppb (2) N/A 6.0 ppb (6) N/A N/A 43.0 ppb (33) 0.34 ppb (4) N/A 30.0 μg/m3 (88) 88.0
 
March 21, 2019, 6 p.m. 10.9 ppb (10) 3.3 ppb (3) N/A 8.0 ppb (7) N/A N/A 37.0 ppb (28) 0.39 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
March 21, 2019, 5 p.m. 12.7 ppb (12) 3.6 ppb (3) N/A 9.0 ppb (8) N/A N/A 33.0 ppb (25) 0.4 ppb (4) N/A 17.0 μg/m3 (61) 61.0
 
March 21, 2019, 4 p.m. 16.8 ppb (16) 6.0 ppb (6) N/A 11.0 ppb (10) N/A N/A 24.0 ppb (18) 0.4 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
March 21, 2019, 3 p.m. 54.5 ppb (51) 33.7 ppb (31) N/A 21.0 ppb (19) N/A N/A 5.0 ppb (4) 0.71 ppb (8) N/A 8.0 μg/m3 (33) 51.0
 
March 21, 2019, 2 p.m. 76.4 ppb (74) 54.1 ppb (50) N/A 22.0 ppb (20) N/A N/A 1.0 ppb (1) 1.28 ppb (14) N/A 2.0 μg/m3 (8) 74.0
 
March 21, 2019, 1 p.m. 38.9 ppb (36) 21.8 ppb (20) N/A 17.0 ppb (16) N/A N/A 1.0 ppb (1) 0.81 ppb (9) N/A -1.0 μg/m3 (0) 36.0
 
March 21, 2019, noon 17.6 ppb (16) 5.3 ppb (5) N/A 12.0 ppb (11) N/A N/A 2.0 ppb (2) 0.45 ppb (5) N/A 0.0 μg/m3 (0) 16.0
 
March 21, 2019, 11 a.m. 8.8 ppb (8) 0.5 ppb (0) N/A 8.0 ppb (7) N/A N/A 7.0 ppb (5) 0.37 ppb (4) N/A 0.0 μg/m3 (0) 8.0
 
March 21, 2019, 10 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A -1.0 μg/m3 (0) N/A
March 21, 2019, 9 a.m. 6.1 ppb (6) 0.2 ppb (0) N/A 6.0 ppb (6) N/A N/A 17.0 ppb (13) 0.35 ppb (4) N/A 0.0 μg/m3 (0) 13.0
 
March 21, 2019, 8 a.m. 8.4 ppb (8) 0.4 ppb (0) N/A 8.0 ppb (7) N/A N/A 16.0 ppb (12) 0.33 ppb (4) N/A -3.0 μg/m3 (0) 12.0
 
March 21, 2019, 7 a.m. 5.4 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A N/A 18.0 ppb (14) 0.34 ppb (4) N/A -3.0 μg/m3 (0) 14.0
 
March 21, 2019, 6 a.m. 5.6 ppb (5) 0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A 20.0 ppb (15) 0.37 ppb (4) N/A 1.0 μg/m3 (4) 15.0
 
March 21, 2019, 5 a.m. 15.7 ppb (15) 0.8 ppb (1) N/A 15.0 ppb (14) N/A N/A 16.0 ppb (12) 0.49 ppb (5) N/A 18.0 μg/m3 (63) 63.0
 
March 21, 2019, 4 a.m. 8.4 ppb (8) 0.2 ppb (0) N/A 8.0 ppb (7) N/A N/A 33.0 ppb (25) 0.47 ppb (5) N/A N/A 25.0
 
March 21, 2019, 3 a.m. 6.0 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A 40.0 ppb (31) 0.35 ppb (4) N/A 0.0 μg/m3 (0) 31.0
 
March 21, 2019, 2 a.m. 3.8 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A 44.0 ppb (34) 0.35 ppb (4) N/A 2.0 μg/m3 (8) 34.0
 
March 21, 2019, 1 a.m. 2.0 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A 48.0 ppb (37) 0.3 ppb (3) N/A 1.0 μg/m3 (4) 37.0
 
March 21, 2019, midnight 2.3 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 49.0 ppb (38) 0.3 ppb (3) N/A 3.0 μg/m3 (12) 38.0
 
March 20, 2019, 11 p.m. 2.0 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 49.0 ppb (38) 0.3 ppb (3) N/A 2.0 μg/m3 (8) 38.0
 
March 20, 2019, 10 p.m. 2.7 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A 49.0 ppb (38) 0.32 ppb (4) N/A 0.0 μg/m3 (0) 38.0
 
March 20, 2019, 9 p.m. 2.5 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A 50.0 ppb (38) 0.32 ppb (4) N/A 3.0 μg/m3 (12) 38.0
 
March 20, 2019, 8 p.m. 2.1 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A N/A 50.0 ppb (38) 0.32 ppb (4) N/A 3.0 μg/m3 (12) 38.0
 
March 20, 2019, 7 p.m. 2.7 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A N/A 50.0 ppb (38) 0.34 ppb (4) N/A 0.0 μg/m3 (0) 38.0
 
March 20, 2019, 6 p.m. 3.1 ppb (3) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A 50.0 ppb (38) 0.34 ppb (4) N/A 1.0 μg/m3 (4) 38.0
 
March 20, 2019, 5 p.m. 6.6 ppb (6) 1.1 ppb (1) N/A 6.0 ppb (6) N/A N/A 46.0 ppb (35) 0.4 ppb (4) N/A 8.0 μg/m3 (33) 35.0
 
March 20, 2019, 4 p.m. 8.6 ppb (8) 1.5 ppb (1) N/A 7.0 ppb (6) N/A N/A 44.0 ppb (34) 0.42 ppb (5) N/A 8.0 μg/m3 (33) 34.0
 
March 20, 2019, 3 p.m. 15.7 ppb (15) 4.0 ppb (4) N/A 12.0 ppb (11) N/A N/A 32.0 ppb (25) 0.59 ppb (7) N/A 0.0 μg/m3 (0) 25.0
 
March 20, 2019, 2 p.m. 15.7 ppb (15) 2.9 ppb (3) N/A 13.0 ppb (12) N/A N/A 27.0 ppb (21) 0.49 ppb (5) N/A 1.0 μg/m3 (4) 21.0
 
March 20, 2019, 1 p.m. 13.3 ppb (12) 3.6 ppb (3) N/A 10.0 ppb (9) N/A N/A 31.0 ppb (24) 0.35 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
March 20, 2019, noon 6.0 ppb (6) 0.3 ppb (0) N/A 6.0 ppb (6) N/A N/A 36.0 ppb (28) 0.34 ppb (4) N/A 4.0 μg/m3 (17) 28.0
 
March 20, 2019, 11 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
March 20, 2019, 10 a.m. 2.4 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 48.0 ppb (37) 0.29 ppb (3) N/A 1.0 μg/m3 (4) 37.0
 
March 20, 2019, 9 a.m. 1.7 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 51.0 ppb (39) 0.28 ppb (3) N/A -2.0 μg/m3 (0) 39.0
 
March 20, 2019, 8 a.m. 2.3 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 48.0 ppb (37) 0.29 ppb (3) N/A 5.0 μg/m3 (21) 37.0
 
March 20, 2019, 7 a.m. 1.4 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A 51.0 ppb (39) 0.28 ppb (3) N/A 6.0 μg/m3 (25) 39.0
 
March 20, 2019, 6 a.m. 1.4 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A 54.0 ppb (42) 0.27 ppb (3) N/A 1.0 μg/m3 (4) 42.0
 
March 20, 2019, 5 a.m. 1.6 ppb (1) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 54.0 ppb (42) 0.28 ppb (3) N/A 1.0 μg/m3 (4) 42.0
 
March 20, 2019, 4 a.m. 2.4 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 48.0 ppb (37) 0.3 ppb (3) N/A 3.0 μg/m3 (12) 37.0
 
March 20, 2019, 3 a.m. 3.5 ppb (3) 0.5 ppb (0) N/A 3.0 ppb (3) N/A N/A 48.0 ppb (37) 0.29 ppb (3) N/A 2.0 μg/m3 (8) 37.0
 
March 20, 2019, 2 a.m. 2.5 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A N/A 56.0 ppb (43) 0.26 ppb (3) N/A 3.0 μg/m3 (12) 43.0
 
March 20, 2019, 1 a.m. 4.5 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A N/A 54.0 ppb (42) 0.28 ppb (3) N/A 7.0 μg/m3 (29) 42.0
 
March 20, 2019, midnight 15.0 ppb (14) 1.9 ppb (2) N/A 13.0 ppb (12) N/A N/A 38.0 ppb (29) 0.4 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 11 p.m. 17.0 ppb (16) 2.7 ppb (3) N/A 14.0 ppb (13) N/A N/A 39.0 ppb (30) 0.43 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 10 p.m. 26.7 ppb (25) 5.5 ppb (5) N/A 21.0 ppb (19) N/A N/A 33.0 ppb (25) 0.53 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 9 p.m. 25.5 ppb (24) 6.1 ppb (6) N/A 19.0 ppb (18) N/A N/A 35.0 ppb (27) 0.49 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 8 p.m. 31.2 ppb (29) 9.4 ppb (9) N/A 22.0 ppb (20) N/A N/A 27.0 ppb (21) 0.55 ppb (6) N/A 16.0 μg/m3 (59) 59.0
 
March 19, 2019, 7 p.m. 33.3 ppb (31) 11.6 ppb (11) N/A 22.0 ppb (20) N/A N/A 23.0 ppb (18) 0.54 ppb (6) N/A 13.0 μg/m3 (52) 52.0
 
March 19, 2019, 6 p.m. 32.3 ppb (30) 12.4 ppb (11) N/A 20.0 ppb (19) N/A N/A 20.0 ppb (15) 0.54 ppb (6) N/A 18.0 μg/m3 (63) 63.0
 
March 19, 2019, 5 p.m. 27.9 ppb (26) 10.2 ppb (9) N/A 18.0 ppb (17) N/A N/A 20.0 ppb (15) 0.54 ppb (6) N/A 16.0 μg/m3 (59) 59.0
 
March 19, 2019, 4 p.m. 19.7 ppb (18) 5.4 ppb (5) N/A 14.0 ppb (13) N/A N/A 20.0 ppb (15) 0.49 ppb (5) N/A 30.0 μg/m3 (88) 88.0
 
March 19, 2019, 3 p.m. 34.9 ppb (32) 14.4 ppb (13) N/A 21.0 ppb (19) N/A N/A 9.0 ppb (7) 0.7 ppb (8) N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 2 p.m. 40.4 ppb (37) 15.1 ppb (14) N/A 25.0 ppb (23) N/A N/A 5.0 ppb (4) 0.89 ppb (10) N/A 22.0 μg/m3 (71) 71.0
 
March 19, 2019, 1 p.m. 17.4 ppb (16) 2.5 ppb (2) N/A 15.0 ppb (14) N/A N/A 13.0 ppb (10) 0.52 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, noon 8.4 ppb (8) 0.2 ppb (0) N/A 8.0 ppb (7) N/A N/A 16.0 ppb (12) 0.39 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
March 19, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 22.0 μg/m3 (71) 71.0
 
March 19, 2019, 10 a.m. 8.7 ppb (8) 0.1 ppb (0) N/A 9.0 ppb (8) N/A N/A 16.0 ppb (12) 0.39 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
March 19, 2019, 9 a.m. 7.7 ppb (7) 0.2 ppb (0) N/A 8.0 ppb (7) N/A N/A 23.0 ppb (18) 0.36 ppb (4) N/A 2.0 μg/m3 (8) 18.0
 
March 19, 2019, 8 a.m. 7.1 ppb (7) 0.1 ppb (0) N/A 7.0 ppb (6) N/A N/A 25.0 ppb (19) 0.36 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
March 19, 2019, 7 a.m. 6.4 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A 33.0 ppb (25) 0.36 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, 6 a.m. 6.1 ppb (6) 0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A 36.0 ppb (28) 0.36 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 5 a.m. 6.7 ppb (6) 0.1 ppb (0) N/A 7.0 ppb (6) N/A N/A 37.0 ppb (28) 0.36 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 4 a.m. 12.3 ppb (11) 0.2 ppb (0) N/A 12.0 ppb (11) N/A N/A 33.0 ppb (25) 0.4 ppb (4) N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 3 a.m. 11.4 ppb (11) 0.2 ppb (0) N/A 11.0 ppb (10) N/A N/A 34.0 ppb (26) 0.43 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
March 19, 2019, 2 a.m. 9.1 ppb (8) 0.3 ppb (0) N/A 9.0 ppb (8) N/A N/A 40.0 ppb (31) 0.41 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 1 a.m. 9.3 ppb (9) 0.7 ppb (1) N/A 9.0 ppb (8) N/A N/A 41.0 ppb (32) 0.42 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
March 19, 2019, midnight 8.8 ppb (8) 1.2 ppb (1) N/A 8.0 ppb (7) N/A N/A 43.0 ppb (33) 0.38 ppb (4) N/A 6.0 μg/m3 (25) 33.0
 
March 18, 2019, 11 p.m. 7.6 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A N/A 52.0 ppb (40) 0.34 ppb (4) N/A 6.0 μg/m3 (25) 40.0
 
March 18, 2019, 10 p.m. 11.8 ppb (11) 1.6 ppb (1) N/A 10.0 ppb (9) N/A N/A 57.0 ppb (44) 0.44 ppb (5) N/A 8.0 μg/m3 (33) 44.0
 
March 18, 2019, 9 p.m. 9.0 ppb (8) 1.1 ppb (1) N/A 8.0 ppb (7) N/A N/A 60.0 ppb (46) 0.37 ppb (4) N/A 8.0 μg/m3 (33) 46.0
 
March 18, 2019, 8 p.m. 12.4 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (9) N/A N/A 54.0 ppb (42) 0.41 ppb (5) N/A 9.0 μg/m3 (38) 42.0
 
March 18, 2019, 7 p.m. 20.5 ppb (19) 4.5 ppb (4) N/A 16.0 ppb (15) N/A N/A 40.0 ppb (31) 0.52 ppb (6) N/A 32.0 μg/m3 (93) 93.0
 
March 18, 2019, 6 p.m. 28.1 ppb (26) 9.2 ppb (9) N/A 19.0 ppb (18) N/A N/A 29.0 ppb (22) 0.51 ppb (6) N/A 16.0 μg/m3 (59) 59.0
 
March 18, 2019, 5 p.m. 32.0 ppb (30) 11.0 ppb (10) N/A 21.0 ppb (19) N/A N/A 22.0 ppb (17) 0.61 ppb (7) N/A 34.0 μg/m3 (97) 97.0
 
March 18, 2019, 4 p.m. 41.9 ppb (39) 17.6 ppb (16) N/A 24.0 ppb (22) N/A N/A 13.0 ppb (10) 0.76 ppb (8) N/A N/A 39.0
 
March 18, 2019, 3 p.m. 86.6 ppb (85) 53.6 ppb (50) N/A 33.0 ppb (31) N/A N/A 4.0 ppb (3) 1.33 ppb (15) N/A 15.0 μg/m3 (56) 85.0
 
March 18, 2019, 2 p.m. 78.9 ppb (76) 49.9 ppb (46) N/A 29.0 ppb (27) N/A N/A 1.0 ppb (1) 1.69 ppb (19) N/A 4.0 μg/m3 (17) 76.0
 
March 18, 2019, 1 p.m. 41.0 ppb (38) 19.0 ppb (18) N/A 22.0 ppb (20) N/A N/A 2.0 ppb (2) 0.68 ppb (8) N/A -2.0 μg/m3 (0) 38.0
 
March 18, 2019, noon 16.7 ppb (15) 1.1 ppb (1) N/A 16.0 ppb (15) N/A N/A 9.0 ppb (7) 0.49 ppb (5) N/A N/A 15.0
 
March 18, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 22.0 μg/m3 (71) 71.0
 
March 18, 2019, 10 a.m. 9.3 ppb (9) 0.1 ppb (0) N/A 9.0 ppb (8) N/A N/A 14.0 ppb (11) 0.45 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, 9 a.m. 9.0 ppb (8) 0.2 ppb (0) N/A 9.0 ppb (8) N/A N/A 17.0 ppb (13) 0.45 ppb (5) N/A 2.0 μg/m3 (8) 13.0
 
March 18, 2019, 8 a.m. 10.7 ppb (10) 0.1 ppb (0) N/A 11.0 ppb (10) N/A N/A 18.0 ppb (14) 0.45 ppb (5) N/A 19.0 μg/m3 (65) 65.0
 
March 18, 2019, 7 a.m. 13.0 ppb (12) 0.1 ppb (0) N/A 13.0 ppb (12) N/A N/A 17.0 ppb (13) 0.48 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
March 18, 2019, 6 a.m. 13.5 ppb (12) 0.1 ppb (0) N/A 13.0 ppb (12) N/A N/A 24.0 ppb (18) 0.49 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
March 18, 2019, 5 a.m. 14.6 ppb (14) 0.2 ppb (0) N/A 14.0 ppb (13) N/A N/A 27.0 ppb (21) 0.53 ppb (6) N/A 10.0 μg/m3 (42) 42.0
 
March 18, 2019, 4 a.m. 31.5 ppb (29) 2.4 ppb (2) N/A 29.0 ppb (27) N/A N/A 16.0 ppb (12) 0.69 ppb (8) N/A 12.0 μg/m3 (50) 50.0
 
March 18, 2019, 3 a.m. 25.5 ppb (24) 0.9 ppb (1) N/A 25.0 ppb (23) N/A N/A 28.0 ppb (22) 0.7 ppb (8) N/A 20.0 μg/m3 (67) 67.0
 
March 18, 2019, 2 a.m. 13.1 ppb (12) 0.3 ppb (0) N/A 13.0 ppb (12) N/A N/A 48.0 ppb (37) 0.47 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
March 18, 2019, 1 a.m. 11.1 ppb (10) 0.5 ppb (0) N/A 11.0 ppb (10) N/A N/A 59.0 ppb (45) 0.41 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
March 18, 2019, midnight 9.1 ppb (8) 0.6 ppb (1) N/A 9.0 ppb (8) N/A N/A 63.0 ppb (48) 0.43 ppb (5) N/A 10.0 μg/m3 (42) 48.0
 
March 17, 2019, 11 p.m. 5.5 ppb (5) 0.4 ppb (0) N/A 5.0 ppb (5) N/A N/A 63.0 ppb (48) 0.4 ppb (4) N/A 9.0 μg/m3 (38) 48.0
 
March 17, 2019, 10 p.m. 5.4 ppb (5) 0.5 ppb (0) N/A 5.0 ppb (5) N/A N/A 58.0 ppb (45) 0.41 ppb (5) N/A 10.0 μg/m3 (42) 45.0
 
March 17, 2019, 9 p.m. 6.5 ppb (6) 0.9 ppb (1) N/A 6.0 ppb (6) N/A N/A 50.0 ppb (38) 0.37 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
March 17, 2019, 8 p.m. 8.1 ppb (8) 1.5 ppb (1) N/A 7.0 ppb (6) N/A N/A 45.0 ppb (35) 0.4 ppb (4) N/A 34.0 μg/m3 (97) 97.0
 
March 17, 2019, 7 p.m. 12.1 ppb (11) 3.1 ppb (3) N/A 9.0 ppb (8) N/A N/A 37.0 ppb (28) 0.45 ppb (5) N/A 22.0 μg/m3 (71) 71.0
 
March 17, 2019, 6 p.m. 13.5 ppb (12) 3.8 ppb (4) N/A 10.0 ppb (9) N/A N/A 32.0 ppb (25) 0.45 ppb (5) N/A 19.0 μg/m3 (65) 65.0
 
March 17, 2019, 5 p.m. 17.8 ppb (16) 6.0 ppb (6) N/A 12.0 ppb (11) N/A N/A 24.0 ppb (18) 0.48 ppb (5) N/A 13.0 μg/m3 (52) 52.0
 
March 17, 2019, 4 p.m. 16.1 ppb (15) 5.0 ppb (5) N/A 11.0 ppb (10) N/A N/A 20.0 ppb (15) 0.49 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
March 17, 2019, 3 p.m. 25.8 ppb (24) 9.7 ppb (9) N/A 16.0 ppb (15) N/A N/A 10.0 ppb (8) 0.53 ppb (6) N/A 5.0 μg/m3 (21) 24.0
 
March 17, 2019, 2 p.m. 23.4 ppb (22) 5.2 ppb (5) N/A 18.0 ppb (17) N/A N/A 4.0 ppb (3) 0.6 ppb (7) N/A 2.0 μg/m3 (8) 22.0
 
March 17, 2019, 1 p.m. 16.2 ppb (15) 1.4 ppb (1) N/A 15.0 ppb (14) N/A N/A 8.0 ppb (6) 0.41 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
March 17, 2019, noon 13.7 ppb (13) 0.4 ppb (0) N/A 13.0 ppb (12) N/A N/A 8.0 ppb (6) 0.39 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
March 17, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 17, 2019, 10 a.m. 10.0 ppb (9) 0.1 ppb (0) N/A 10.0 ppb (9) N/A N/A 15.0 ppb (12) 0.39 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
March 17, 2019, 9 a.m. 11.1 ppb (10) 0.2 ppb (0) N/A 11.0 ppb (10) N/A N/A 12.0 ppb (9) 0.43 ppb (5) N/A 7.0 μg/m3 (29) 29.0