AQSQID: 060811001

Site Name: Redwood City

Location: Redwood City (Ampex), CA

Reporting: True, Located: True

Current AQI: 56.0

Redwood City (Ampex) CA, US: 37.4828, -122.2022

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Jan. 25, 2020, 11 p.m. 8.0 ppb (7) 0.9 ppb (1) N/A 7.0 ppb (6) N/A N/A 27.0 ppb (21) 0.36 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 25, 2020, 10 p.m. 8.5 ppb (8) 1.7 ppb (2) N/A 7.0 ppb (6) N/A N/A 28.0 ppb (22) 0.36 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 25, 2020, 9 p.m. 11.4 ppb (11) 3.5 ppb (3) N/A 8.0 ppb (7) N/A N/A 24.0 ppb (18) 0.39 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 25, 2020, 8 p.m. 13.9 ppb (13) 5.7 ppb (5) N/A 8.0 ppb (7) N/A N/A 21.0 ppb (16) 0.39 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 25, 2020, 7 p.m. 12.7 ppb (12) 5.1 ppb (5) N/A 8.0 ppb (7) N/A N/A 20.0 ppb (15) 0.39 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 25, 2020, 6 p.m. 8.2 ppb (8) 1.9 ppb (2) N/A 6.0 ppb (6) N/A N/A 20.0 ppb (15) 0.37 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 25, 2020, 5 p.m. 14.8 ppb (14) 6.3 ppb (6) N/A 9.0 ppb (8) N/A N/A 7.0 ppb (5) 0.49 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 25, 2020, 4 p.m. 31.9 ppb (30) 21.6 ppb (20) N/A 10.0 ppb (9) N/A N/A 5.0 ppb (4) 0.72 ppb (8) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 25, 2020, 3 p.m. 42.3 ppb (39) 28.9 ppb (27) N/A 13.0 ppb (12) N/A N/A 2.0 ppb (2) 0.88 ppb (10) N/A 8.0 μg/m3 (33) 39.0
 
Jan. 25, 2020, 2 p.m. 23.0 ppb (21) 10.4 ppb (10) N/A 13.0 ppb (12) N/A N/A 0.0 ppb (0) 0.57 ppb (6) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 25, 2020, 1 p.m. 10.7 ppb (10) 0.7 ppb (1) N/A 10.0 ppb (9) N/A N/A 4.0 ppb (3) 0.41 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 25, 2020, noon 10.2 ppb (9) 0.1 ppb (0) N/A 10.0 ppb (9) N/A N/A 8.0 ppb (6) 0.4 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 25, 2020, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 25, 2020, 10 a.m. 9.4 ppb (9) -0.1 ppb (0) N/A 10.0 ppb (9) N/A N/A 18.0 ppb (14) 0.35 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 25, 2020, 9 a.m. 8.2 ppb (8) -0.2 ppb (0) N/A 8.0 ppb (7) N/A N/A 21.0 ppb (16) 0.34 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 25, 2020, 8 a.m. 26.5 ppb (25) 7.6 ppb (7) N/A 19.0 ppb (18) N/A N/A 2.0 ppb (2) 0.59 ppb (7) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 25, 2020, 7 a.m. 31.6 ppb (29) 12.2 ppb (11) N/A 19.0 ppb (18) N/A N/A 0.0 ppb (0) 0.65 ppb (7) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 25, 2020, 6 a.m. 32.5 ppb (30) 12.6 ppb (12) N/A 20.0 ppb (19) N/A N/A 0.0 ppb (0) 0.69 ppb (8) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 25, 2020, 5 a.m. 25.1 ppb (23) 5.2 ppb (5) N/A 20.0 ppb (19) N/A N/A 3.0 ppb (2) 0.58 ppb (6) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 25, 2020, 4 a.m. 14.7 ppb (14) 0.6 ppb (1) N/A 14.0 ppb (13) N/A N/A 14.0 ppb (11) 0.48 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 25, 2020, 3 a.m. 10.1 ppb (9) 0.0 ppb (0) N/A 10.0 ppb (9) N/A N/A 22.0 ppb (17) 0.38 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 25, 2020, 2 a.m. 13.3 ppb (12) 0.3 ppb (0) N/A 13.0 ppb (12) N/A N/A 19.0 ppb (15) 0.39 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 25, 2020, 1 a.m. 17.5 ppb (16) 1.0 ppb (1) N/A 17.0 ppb (16) N/A N/A 16.0 ppb (12) 0.43 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 25, 2020, midnight 17.7 ppb (16) 2.6 ppb (2) N/A 15.0 ppb (14) N/A N/A 20.0 ppb (15) 0.46 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 24, 2020, 11 p.m. 12.8 ppb (12) 2.5 ppb (2) N/A 10.0 ppb (9) N/A N/A 26.0 ppb (20) 0.37 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 24, 2020, 10 p.m. 11.2 ppb (10) 2.7 ppb (3) N/A 9.0 ppb (8) N/A N/A 28.0 ppb (22) 0.36 ppb (4) N/A 5.0 μg/m3 (21) 22.0
 
Jan. 24, 2020, 9 p.m. 10.2 ppb (9) 2.6 ppb (2) N/A 8.0 ppb (7) N/A N/A 29.0 ppb (22) 0.35 ppb (4) N/A 2.0 μg/m3 (8) 22.0
 
Jan. 24, 2020, 8 p.m. 8.5 ppb (8) 2.2 ppb (2) N/A 6.0 ppb (6) N/A N/A 29.0 ppb (22) 0.33 ppb (4) N/A 5.0 μg/m3 (21) 22.0
 
Jan. 24, 2020, 7 p.m. 29.9 ppb (28) 13.9 ppb (13) N/A 16.0 ppb (15) N/A N/A 13.0 ppb (10) 0.51 ppb (6) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 24, 2020, 6 p.m. 36.1 ppb (33) 18.4 ppb (17) N/A 18.0 ppb (17) N/A N/A 9.0 ppb (7) 0.56 ppb (6) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 24, 2020, 5 p.m. 41.4 ppb (38) 24.4 ppb (23) N/A 17.0 ppb (16) N/A N/A 6.0 ppb (5) 0.61 ppb (7) N/A 13.0 μg/m3 (52) 52.0
 
Jan. 24, 2020, 4 p.m. 73.9 ppb (71) 56.3 ppb (52) N/A 18.0 ppb (17) N/A N/A 1.0 ppb (1) 1.02 ppb (11) N/A 10.0 μg/m3 (42) 71.0
 
Jan. 24, 2020, 3 p.m. 106.4 ppb (101) 90.6 ppb (89) N/A 16.0 ppb (15) N/A N/A 0.0 ppb (0) 1.74 ppb (19) N/A 7.0 μg/m3 (29) 101.0
 
Jan. 24, 2020, 2 p.m. 52.0 ppb (48) 39.9 ppb (37) N/A 12.0 ppb (11) N/A N/A 0.0 ppb (0) 0.95 ppb (11) N/A 5.0 μg/m3 (21) 48.0
 
Jan. 24, 2020, 1 p.m. 23.8 ppb (22) 13.8 ppb (13) N/A 10.0 ppb (9) N/A N/A 0.0 ppb (0) 0.51 ppb (6) N/A 5.0 μg/m3 (21) 22.0
 
Jan. 24, 2020, noon 25.0 ppb (23) 16.4 ppb (15) N/A 9.0 ppb (8) N/A N/A 0.0 ppb (0) 0.49 ppb (5) N/A 4.0 μg/m3 (17) 23.0
 
Jan. 24, 2020, 11 a.m. 16.1 ppb (15) 7.3 ppb (7) N/A 9.0 ppb (8) N/A N/A 0.0 ppb (0) 0.44 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 24, 2020, 10 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
 
Jan. 24, 2020, 9 a.m. 37.3 ppb (35) 16.5 ppb (15) N/A 21.0 ppb (19) N/A N/A 0.0 ppb (0) 0.71 ppb (8) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 24, 2020, 8 a.m. 21.6 ppb (20) 10.5 ppb (10) N/A 11.0 ppb (10) N/A N/A 0.0 ppb (0) 0.65 ppb (7) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 24, 2020, 7 a.m. 24.1 ppb (22) 11.8 ppb (11) N/A 12.0 ppb (11) N/A N/A 0.0 ppb (0) 0.58 ppb (6) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 24, 2020, 6 a.m. 37.2 ppb (34) 16.7 ppb (15) N/A 21.0 ppb (19) N/A N/A 0.0 ppb (0) 0.64 ppb (7) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 24, 2020, 5 a.m. 27.5 ppb (25) 3.0 ppb (3) N/A 25.0 ppb (23) N/A N/A 3.0 ppb (2) 0.52 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 24, 2020, 4 a.m. 22.1 ppb (20) 1.4 ppb (1) N/A 21.0 ppb (19) N/A N/A 7.0 ppb (5) 0.49 ppb (5) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 24, 2020, 3 a.m. 24.4 ppb (23) 2.7 ppb (3) N/A 22.0 ppb (20) N/A N/A 7.0 ppb (5) 0.6 ppb (7) N/A 16.0 μg/m3 (59) 59.0
 
Jan. 24, 2020, 2 a.m. 29.7 ppb (28) 4.6 ppb (4) N/A 25.0 ppb (23) N/A N/A 4.0 ppb (3) 0.6 ppb (7) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 24, 2020, 1 a.m. 23.2 ppb (21) 2.9 ppb (3) N/A 20.0 ppb (19) N/A N/A 10.0 ppb (8) 0.56 ppb (6) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 24, 2020, midnight 21.9 ppb (20) 5.2 ppb (5) N/A 17.0 ppb (16) N/A N/A 13.0 ppb (10) 0.65 ppb (7) N/A 16.0 μg/m3 (59) 59.0
 
Jan. 23, 2020, 11 p.m. 14.3 ppb (13) 2.4 ppb (2) N/A 12.0 ppb (11) N/A N/A 23.0 ppb (18) 0.47 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 23, 2020, 10 p.m. 9.7 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A N/A 29.0 ppb (22) 0.36 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 23, 2020, 9 p.m. 10.5 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A N/A 26.0 ppb (20) 0.35 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 23, 2020, 8 p.m. 14.0 ppb (13) 3.7 ppb (3) N/A 10.0 ppb (9) N/A N/A 19.0 ppb (15) 0.4 ppb (4) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 23, 2020, 7 p.m. 17.8 ppb (16) 6.6 ppb (6) N/A 11.0 ppb (10) N/A N/A 16.0 ppb (12) 0.43 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 23, 2020, 6 p.m. 19.6 ppb (18) 7.5 ppb (7) N/A 12.0 ppb (11) N/A N/A 13.0 ppb (10) 0.46 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 23, 2020, 5 p.m. 24.3 ppb (23) 10.9 ppb (10) N/A 13.0 ppb (12) N/A N/A 10.0 ppb (8) 0.53 ppb (6) N/A 17.0 μg/m3 (61) 61.0
 
Jan. 23, 2020, 4 p.m. 82.9 ppb (81) 64.7 ppb (61) N/A 18.0 ppb (17) N/A N/A 1.0 ppb (1) 1.37 ppb (15) N/A 10.0 μg/m3 (42) 81.0
 
Jan. 23, 2020, 3 p.m. 115.0 ppb (103) 95.5 ppb (94) N/A 19.0 ppb (18) N/A N/A 0.0 ppb (0) 1.47 ppb (16) N/A 9.0 μg/m3 (38) 103.0
 
Jan. 23, 2020, 2 p.m. 48.7 ppb (45) 33.8 ppb (31) N/A 15.0 ppb (14) N/A N/A 0.0 ppb (0) 0.8 ppb (9) N/A 7.0 μg/m3 (29) 45.0
 
Jan. 23, 2020, 1 p.m. 24.0 ppb (22) 12.6 ppb (12) N/A 11.0 ppb (10) N/A N/A 0.0 ppb (0) 0.46 ppb (5) N/A 4.0 μg/m3 (17) 22.0
 
Jan. 23, 2020, noon 30.6 ppb (28) 21.4 ppb (20) N/A 9.0 ppb (8) N/A N/A 0.0 ppb (0) 0.45 ppb (5) N/A 2.0 μg/m3 (8) 28.0
 
Jan. 23, 2020, 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
 
Jan. 23, 2020, 10 a.m. 19.4 ppb (18) 10.2 ppb (9) N/A 9.0 ppb (8) N/A N/A 0.0 ppb (0) 0.45 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 23, 2020, 9 a.m. 17.8 ppb (16) 8.5 ppb (8) N/A 9.0 ppb (8) N/A N/A 0.0 ppb (0) 0.43 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 23, 2020, 8 a.m. 20.9 ppb (19) 10.6 ppb (10) N/A 10.0 ppb (9) N/A N/A 0.0 ppb (0) 0.48 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 23, 2020, 7 a.m. 24.5 ppb (23) 11.2 ppb (10) N/A 13.0 ppb (12) N/A N/A 0.0 ppb (0) 0.51 ppb (6) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 23, 2020, 6 a.m. 30.2 ppb (28) 14.8 ppb (14) N/A 15.0 ppb (14) N/A N/A 0.0 ppb (0) 0.55 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 23, 2020, 5 a.m. 28.0 ppb (26) 13.3 ppb (12) N/A 15.0 ppb (14) N/A N/A 1.0 ppb (1) 0.77 ppb (9) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 23, 2020, 4 a.m. 20.1 ppb (19) 4.7 ppb (4) N/A 15.0 ppb (14) N/A N/A 2.0 ppb (2) 0.56 ppb (6) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 23, 2020, 3 a.m. 36.0 ppb (33) 9.2 ppb (9) N/A 27.0 ppb (25) N/A N/A 3.0 ppb (2) 0.67 ppb (7) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 23, 2020, 2 a.m. 15.5 ppb (14) 0.9 ppb (1) N/A 15.0 ppb (14) N/A N/A 20.0 ppb (15) 0.45 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 23, 2020, 1 a.m. 14.4 ppb (13) 1.8 ppb (2) N/A 13.0 ppb (12) N/A N/A 22.0 ppb (17) 0.47 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 23, 2020, midnight 8.9 ppb (8) 1.3 ppb (1) N/A 8.0 ppb (7) N/A N/A 29.0 ppb (22) 0.36 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 22, 2020, 11 p.m. 11.4 ppb (11) 2.6 ppb (2) N/A 9.0 ppb (8) N/A N/A 27.0 ppb (21) 0.36 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 22, 2020, 10 p.m. 6.7 ppb (6) 1.5 ppb (1) N/A 5.0 ppb (5) N/A N/A 31.0 ppb (24) 0.31 ppb (3) N/A 2.0 μg/m3 (8) 24.0
 
Jan. 22, 2020, 9 p.m. 5.3 ppb (5) 1.4 ppb (1) N/A 4.0 ppb (4) N/A N/A 32.0 ppb (25) 0.28 ppb (3) N/A 1.0 μg/m3 (4) 25.0
 
Jan. 22, 2020, 8 p.m. 4.9 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 32.0 ppb (25) 0.32 ppb (4) N/A 4.0 μg/m3 (17) 25.0
 
Jan. 22, 2020, 7 p.m. 12.0 ppb (11) 4.4 ppb (4) N/A 8.0 ppb (7) N/A N/A 24.0 ppb (18) 0.35 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 22, 2020, 6 p.m. 10.3 ppb (10) 1.9 ppb (2) N/A 8.0 ppb (7) N/A N/A 20.0 ppb (15) 0.37 ppb (4) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 22, 2020, 5 p.m. 17.0 ppb (16) 4.2 ppb (4) N/A 13.0 ppb (12) N/A N/A 16.0 ppb (12) 0.4 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 22, 2020, 4 p.m. 25.7 ppb (24) 7.2 ppb (7) N/A 18.0 ppb (17) N/A N/A 8.0 ppb (6) 0.49 ppb (5) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 22, 2020, 3 p.m. 35.8 ppb (33) 11.6 ppb (11) N/A 24.0 ppb (22) N/A N/A 2.0 ppb (2) 0.55 ppb (6) N/A 5.0 μg/m3 (21) 33.0
 
Jan. 22, 2020, 2 p.m. 25.4 ppb (24) 3.5 ppb (3) N/A 22.0 ppb (20) N/A N/A 2.0 ppb (2) 0.53 ppb (6) N/A 4.0 μg/m3 (17) 24.0
 
Jan. 22, 2020, 1 p.m. 16.0 ppb (15) 0.3 ppb (0) N/A 16.0 ppb (15) N/A N/A 8.0 ppb (6) 0.39 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 22, 2020, noon 11.3 ppb (10) 0.0 ppb (0) N/A 11.0 ppb (10) N/A N/A 14.0 ppb (11) 0.44 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 22, 2020, 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
Jan. 22, 2020, 10 a.m. 3.6 ppb (3) -0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (19) 0.29 ppb (3) N/A 0.0 μg/m3 (0) 19.0
 
Jan. 22, 2020, 9 a.m. 3.1 ppb (3) -0.2 ppb (0) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) 0.28 ppb (3) N/A 2.0 μg/m3 (8) 20.0
 
Jan. 22, 2020, 8 a.m. 4.1 ppb (4) -0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A 26.0 ppb (20) 0.29 ppb (3) N/A 2.0 μg/m3 (8) 20.0
 
Jan. 22, 2020, 7 a.m. 6.0 ppb (6) -0.1 ppb (0) N/A 6.0 ppb (6) N/A N/A 24.0 ppb (18) 0.3 ppb (3) N/A 1.0 μg/m3 (4) 18.0
 
Jan. 22, 2020, 6 a.m. 1.4 ppb (1) -0.2 ppb (0) N/A 2.0 ppb (2) N/A N/A 31.0 ppb (24) 0.26 ppb (3) N/A 1.0 μg/m3 (4) 24.0
 
Jan. 22, 2020, 5 a.m. 4.1 ppb (4) 0.2 ppb (0) N/A 4.0 ppb (4) N/A N/A 28.0 ppb (22) 0.29 ppb (3) N/A 1.0 μg/m3 (4) 22.0
 
Jan. 22, 2020, 4 a.m. 8.8 ppb (8) 0.5 ppb (0) N/A 8.0 ppb (7) N/A N/A 22.0 ppb (17) 0.34 ppb (4) N/A 2.0 μg/m3 (8) 17.0
 
Jan. 22, 2020, 3 a.m. 10.6 ppb (10) 0.9 ppb (1) N/A 10.0 ppb (9) N/A N/A 21.0 ppb (16) 0.36 ppb (4) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 22, 2020, 2 a.m. 10.6 ppb (10) 0.5 ppb (0) N/A 10.0 ppb (9) N/A N/A 20.0 ppb (15) 0.37 ppb (4) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 22, 2020, 1 a.m. 4.2 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A N/A 28.0 ppb (22) 0.3 ppb (3) N/A 4.0 μg/m3 (17) 22.0
 
Jan. 22, 2020, midnight 3.9 ppb (4) 0.4 ppb (0) N/A 4.0 ppb (4) N/A N/A 29.0 ppb (22) 0.3 ppb (3) N/A 4.0 μg/m3 (17) 22.0
 
Jan. 21, 2020, 11 p.m. 4.0 ppb (4) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 30.0 ppb (23) 0.29 ppb (3) N/A 2.0 μg/m3 (8) 23.0
 
Jan. 21, 2020, 10 p.m. 2.4 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A N/A 32.0 ppb (25) 0.28 ppb (3) N/A 2.0 μg/m3 (8) 25.0
 
Jan. 21, 2020, 9 p.m. 3.7 ppb (3) 1.3 ppb (1) N/A 2.0 ppb (2) N/A N/A 31.0 ppb (24) 0.26 ppb (3) N/A 3.0 μg/m3 (12) 24.0
 
Jan. 21, 2020, 8 p.m. 3.0 ppb (3) 0.6 ppb (1) N/A 2.0 ppb (2) N/A N/A 31.0 ppb (24) 0.26 ppb (3) N/A 3.0 μg/m3 (12) 24.0
 
Jan. 21, 2020, 7 p.m. 3.3 ppb (3) 0.6 ppb (1) N/A 3.0 ppb (3) N/A N/A 32.0 ppb (25) 0.26 ppb (3) N/A 5.0 μg/m3 (21) 25.0
 
Jan. 21, 2020, 5 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 7.0 μg/m3 (29) 29.0
 
Jan. 21, 2020, 4 p.m. 36.6 ppb (34) 11.8 ppb (11) N/A 25.0 ppb (23) N/A N/A 8.0 ppb (6) 0.7 ppb (8) N/A 7.0 μg/m3 (29) 34.0
 
Jan. 21, 2020, 3 p.m. 34.8 ppb (32) 9.7 ppb (9) N/A 25.0 ppb (23) N/A N/A 8.0 ppb (6) 0.78 ppb (9) N/A 5.0 μg/m3 (21) 32.0
 
Jan. 21, 2020, 2 p.m. 18.9 ppb (18) 1.9 ppb (2) N/A 17.0 ppb (16) N/A N/A 16.0 ppb (12) 0.53 ppb (6) N/A 3.0 μg/m3 (12) 18.0
 
Jan. 21, 2020, 1 p.m. 12.3 ppb (11) 0.3 ppb (0) N/A 12.0 ppb (11) N/A N/A 19.0 ppb (15) 0.42 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 21, 2020, noon 11.7 ppb (11) 0.2 ppb (0) N/A 11.0 ppb (10) N/A N/A 18.0 ppb (14) 0.44 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 21, 2020, 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
 
Jan. 21, 2020, 10 a.m. 9.3 ppb (9) -0.1 ppb (0) N/A 9.0 ppb (8) N/A N/A 21.0 ppb (16) 0.44 ppb (5) N/A 3.0 μg/m3 (12) 16.0
 
Jan. 21, 2020, 9 a.m. 5.3 ppb (5) -0.2 ppb (0) N/A 6.0 ppb (6) N/A N/A 27.0 ppb (21) 0.36 ppb (4) N/A 4.0 μg/m3 (17) 21.0
 
Jan. 21, 2020, 8 a.m. 9.2 ppb (9) 0.1 ppb (0) N/A 9.0 ppb (8) N/A N/A 23.0 ppb (18) 0.41 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 21, 2020, 7 a.m. 20.0 ppb (19) 2.3 ppb (2) N/A 18.0 ppb (17) N/A N/A 9.0 ppb (7) 0.58 ppb (6) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 21, 2020, 6 a.m. 13.1 ppb (12) 1.1 ppb (1) N/A 12.0 ppb (11) N/A N/A 16.0 ppb (12) 0.59 ppb (7) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 21, 2020, 5 a.m. 23.0 ppb (21) 4.3 ppb (4) N/A 19.0 ppb (18) N/A N/A 10.0 ppb (8) 0.56 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 21, 2020, 4 a.m. 26.1 ppb (24) 5.0 ppb (5) N/A 21.0 ppb (19) N/A N/A 11.0 ppb (8) 0.68 ppb (8) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 21, 2020, 3 a.m. 21.5 ppb (20) 1.4 ppb (1) N/A 20.0 ppb (19) N/A N/A 14.0 ppb (11) 0.62 ppb (7) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 21, 2020, 2 a.m. 20.9 ppb (19) 2.4 ppb (2) N/A 19.0 ppb (18) N/A N/A 16.0 ppb (12) 0.58 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 21, 2020, 1 a.m. 25.3 ppb (23) 5.9 ppb (5) N/A 19.0 ppb (18) N/A N/A 9.0 ppb (7) 0.72 ppb (8) N/A 16.0 μg/m3 (59) 59.0
 
Jan. 21, 2020, midnight 30.3 ppb (28) 10.1 ppb (9) N/A 20.0 ppb (19) N/A N/A 4.0 ppb (3) 0.72 ppb (8) N/A 19.0 μg/m3 (65) 65.0
 
Jan. 20, 2020, 11 p.m. 28.9 ppb (27) 10.7 ppb (10) N/A 18.0 ppb (17) N/A N/A 6.0 ppb (5) 0.71 ppb (8) N/A 19.0 μg/m3 (65) 65.0
 
Jan. 20, 2020, 10 p.m. 22.8 ppb (21) 9.4 ppb (9) N/A 13.0 ppb (12) N/A N/A 8.0 ppb (6) 0.66 ppb (7) N/A 20.0 μg/m3 (67) 67.0
 
Jan. 20, 2020, 9 p.m. 18.7 ppb (17) 7.7 ppb (7) N/A 11.0 ppb (10) N/A N/A 10.0 ppb (8) 0.56 ppb (6) N/A 14.0 μg/m3 (54) 54.0
 
Jan. 20, 2020, 8 p.m. 21.4 ppb (20) 9.3 ppb (9) N/A 12.0 ppb (11) N/A N/A 6.0 ppb (5) 0.58 ppb (6) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 20, 2020, 7 p.m. 27.7 ppb (26) 13.4 ppb (12) N/A 14.0 ppb (13) N/A N/A 4.0 ppb (3) 0.62 ppb (7) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 20, 2020, 6 p.m. 31.2 ppb (29) 17.2 ppb (16) N/A 14.0 ppb (13) N/A N/A 5.0 ppb (4) 0.66 ppb (7) N/A 15.0 μg/m3 (56) 56.0
 
Jan. 20, 2020, 5 p.m. 35.0 ppb (32) 21.2 ppb (20) N/A 14.0 ppb (13) N/A N/A 1.0 ppb (1) 0.68 ppb (8) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 20, 2020, 4 p.m. 48.0 ppb (44) 33.8 ppb (31) N/A 14.0 ppb (13) N/A N/A 1.0 ppb (1) 0.92 ppb (10) N/A 9.0 μg/m3 (38) 44.0
 
Jan. 20, 2020, 3 p.m. 57.6 ppb (54) 42.6 ppb (39) N/A 15.0 ppb (14) N/A N/A 0.0 ppb (0) 1.18 ppb (13) N/A 9.0 μg/m3 (38) 54.0
 
Jan. 20, 2020, 2 p.m. 32.8 ppb (30) 20.3 ppb (19) N/A 12.0 ppb (11) N/A N/A 0.0 ppb (0) 0.7 ppb (8) N/A 7.0 μg/m3 (29) 30.0
 
Jan. 20, 2020, 1 p.m. 22.7 ppb (21) 11.5 ppb (11) N/A 11.0 ppb (10) N/A N/A 0.0 ppb (0) 0.64 ppb (7) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 20, 2020, noon 22.4 ppb (21) 10.5 ppb (10) N/A 12.0 ppb (11) N/A N/A 0.0 ppb (0) 0.56 ppb (6) N/A 13.0 μg/m3 (52) 52.0
 
Jan. 20, 2020, 11 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
 
Jan. 20, 2020, 10 a.m. 26.8 ppb (25) 13.5 ppb (12) N/A 13.0 ppb (12) N/A N/A 0.0 ppb (0) 0.69 ppb (8) N/A 12.0 μg/m3 (50) 50.0
 
Jan. 20, 2020, 9 a.m. 30.0 ppb (28) 16.1 ppb (15) N/A 14.0 ppb (13) N/A N/A 0.0 ppb (0) 0.77 ppb (9) N/A 17.0 μg/m3 (61) 61.0
 
Jan. 20, 2020, 8 a.m. 32.2 ppb (30) 17.1 ppb (16) N/A 15.0 ppb (14) N/A N/A 0.0 ppb (0) 0.82 ppb (9) N/A 19.0 μg/m3 (65) 65.0
 
Jan. 20, 2020, 7 a.m. 29.5 ppb (27) 14.5 ppb (13) N/A 15.0 ppb (14) N/A N/A 1.0 ppb (1) 0.76 ppb (8) N/A 17.0 μg/m3 (61) 61.0
 
Jan. 20, 2020, 6 a.m. 28.5 ppb (26) 12.7 ppb (12) N/A 16.0 ppb (15) N/A N/A 0.0 ppb (0) 0.75 ppb (8) N/A 21.0 μg/m3 (69) 69.0
 
Jan. 20, 2020, 5 a.m. 33.4 ppb (31) 16.6 ppb (15) N/A 17.0 ppb (16) N/A N/A 1.0 ppb (1) 0.8 ppb (9) N/A 24.0 μg/m3 (76) 76.0
 
Jan. 20, 2020, 4 a.m. 39.5 ppb (37) 20.9 ppb (19) N/A 19.0 ppb (18) N/A N/A 0.0 ppb (0) 0.83 ppb (9) N/A 25.0 μg/m3 (78) 78.0
 
Jan. 20, 2020, 3 a.m. 38.8 ppb (36) 18.5 ppb (17) N/A 20.0 ppb (19) N/A N/A 1.0 ppb (1) 0.94 ppb (10) N/A 26.0 μg/m3 (80) 80.0
 
Jan. 20, 2020, 2 a.m. 37.2 ppb (34) 15.2 ppb (14) N/A 22.0 ppb (20) N/A N/A 1.0 ppb (1) 0.88 ppb (10) N/A 32.0 μg/m3 (93) 93.0
 
Jan. 20, 2020, 1 a.m. 16.5 ppb (15) 1.8 ppb (2) N/A 15.0 ppb (14) N/A N/A 8.0 ppb (6) 0.61 ppb (7) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 20, 2020, midnight 8.4 ppb (8) 1.4 ppb (1) N/A 7.0 ppb (6) N/A N/A 14.0 ppb (11) 0.47 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2020, 11 p.m. 8.0 ppb (7) 1.6 ppb (1) N/A 6.0 ppb (6) N/A N/A 17.0 ppb (13) 0.44 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2020, 10 p.m. 7.9 ppb (7) 1.5 ppb (1) N/A 6.0 ppb (6) N/A N/A 19.0 ppb (15) 0.42 ppb (5) N/A 4.0 μg/m3 (17) 17.0
 
Jan. 19, 2020, 9 p.m. 6.7 ppb (6) 1.5 ppb (1) N/A 5.0 ppb (5) N/A N/A 20.0 ppb (15) 0.42 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2020, 8 p.m. 7.7 ppb (7) 2.2 ppb (2) N/A 6.0 ppb (6) N/A N/A 20.0 ppb (15) 0.42 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2020, 7 p.m. 9.4 ppb (9) 2.7 ppb (3) N/A 7.0 ppb (6) N/A N/A 19.0 ppb (15) 0.42 ppb (5) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 19, 2020, 6 p.m. 21.5 ppb (20) 7.4 ppb (7) N/A 14.0 ppb (13) N/A N/A 8.0 ppb (6) 0.52 ppb (6) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2020, 5 p.m. 35.2 ppb (33) 16.9 ppb (16) N/A 18.0 ppb (17) N/A N/A 3.0 ppb (2) 0.81 ppb (9) N/A 5.0 μg/m3 (21) 33.0
 
Jan. 19, 2020, 4 p.m. 36.8 ppb (34) 19.5 ppb (18) N/A 17.0 ppb (16) N/A N/A 1.0 ppb (1) 0.82 ppb (9) N/A 6.0 μg/m3 (25) 34.0
 
Jan. 19, 2020, 3 p.m. 32.1 ppb (30) 15.9 ppb (15) N/A 16.0 ppb (15) N/A N/A 0.0 ppb (0) 0.59 ppb (7) N/A 7.0 μg/m3 (29) 30.0
 
Jan. 19, 2020, 2 p.m. 25.1 ppb (23) 8.6 ppb (8) N/A 17.0 ppb (16) N/A N/A 0.0 ppb (0) 0.52 ppb (6) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2020, 1 p.m. 24.7 ppb (23) 7.9 ppb (7) N/A 17.0 ppb (16) N/A N/A 0.0 ppb (0) 0.54 ppb (6) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2020, noon 24.3 ppb (23) 6.4 ppb (6) N/A 18.0 ppb (17) N/A N/A 1.0 ppb (1) 0.53 ppb (6) N/A 4.0 μg/m3 (17) 23.0
 
Jan. 19, 2020, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 3.0 μg/m3 (12) 12.0
 
Jan. 19, 2020, 10 a.m. 17.7 ppb (16) 1.4 ppb (1) N/A 16.0 ppb (15) N/A N/A 3.0 ppb (2) 0.49 ppb (5) N/A 7.0 μg/m3 (29) 29.0
 
Jan. 19, 2020, 9 a.m. 19.8 ppb (18) 2.1 ppb (2) N/A 18.0 ppb (17) N/A N/A 4.0 ppb (3) 0.51 ppb (6) N/A 10.0 μg/m3 (42) 42.0
 
Jan. 19, 2020, 8 a.m. 21.4 ppb (20) 2.7 ppb (3) N/A 19.0 ppb (18) N/A N/A 4.0 ppb (3) 0.54 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
Jan. 19, 2020, 7 a.m. 12.2 ppb (11) 0.2 ppb (0) N/A 12.0 ppb (11) N/A N/A 12.0 ppb (9) 0.46 ppb (5) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 19, 2020, 6 a.m. 16.5 ppb (15) 1.1 ppb (1) N/A 15.0 ppb (14) N/A N/A 10.0 ppb (8) 0.51 ppb (6) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 19, 2020, 5 a.m. 16.7 ppb (15) 1.9 ppb (2) N/A 15.0 ppb (14) N/A N/A 7.0 ppb (5) 0.54 ppb (6) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 19, 2020, 4 a.m. 15.8 ppb (15) 1.2 ppb (1) N/A 15.0 ppb (14) N/A N/A 7.0 ppb (5) 0.53 ppb (6) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 19, 2020, 3 a.m. 21.2 ppb (20) 2.6 ppb (2) N/A 19.0 ppb (18) N/A N/A 5.0 ppb (4) 0.59 ppb (7) N/A 11.0 μg/m3 (46) 46.0
 
Jan. 19, 2020, 2 a.m. 25.5 ppb (24) 5.0 ppb (5) N/A 21.0 ppb (19) N/A N/A 8.0 ppb (6) 0.67 ppb (7) N/A 8.0 μg/m3 (33) 33.0
 
Jan. 19, 2020, 1 a.m. 10.8 ppb (10) 0.7 ppb (1) N/A 10.0 ppb (9) N/A N/A 22.0 ppb (17) 0.42 ppb (5) N/A 5.0 μg/m3 (21) 21.0
 
Jan. 19, 2020, midnight 7.1 ppb (7) 0.8 ppb (1) N/A 6.0 ppb (6) N/A N/A 27.0 ppb (21) 0.4 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Jan. 18, 2020, 11 p.m. 5.4 ppb (5) 0.9 ppb (1) N/A 4.0 ppb (4) N/A N/A 30.0 ppb (23) 0.37 ppb (4) N/A 7.0 μg/m3 (29) 29.0