AQSQID: 060371103

Site Name: Los Angeles - N. Main Street

Location: LA (Chavez Ravine Place), CA

Reporting: True, Located: True

Current AQI: 59.0

LA (Chavez Ravine Place) CA, US: 34.0669, -118.2417

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 25, 2019, 8 a.m. 18.7 ppb (17) 0.8 ppb (1) 17.1 ppb (16) 18.0 ppb (17) 16.7 ppb (15) 0.0 ppb (0) 14.0 ppb (11) 0.4 ppb (4) 27.0 μg/m3 (25) 15.0 μg/m3 (56) 56.0
 
March 25, 2019, 7 a.m. 13.5 ppb (12) 0.5 ppb (0) 16.1 ppb (15) 13.0 ppb (12) 14.9 ppb (14) 0.0 ppb (0) 21.0 ppb (16) 0.45 ppb (5) 28.0 μg/m3 (25) 16.0 μg/m3 (59) 59.0
 
March 25, 2019, 6 a.m. 16.8 ppb (16) 0.9 ppb (1) 14.5 ppb (13) 16.0 ppb (15) 14.2 ppb (13) 0.0 ppb (0) 21.0 ppb (16) 0.5 ppb (6) 22.0 μg/m3 (20) 12.0 μg/m3 (50) 50.0
 
March 25, 2019, 5 a.m. 15.1 ppb (14) 0.4 ppb (0) 14.3 ppb (13) 15.0 ppb (14) 14.2 ppb (13) 0.0 ppb (0) 23.0 ppb (18) 0.4 ppb (4) 26.0 μg/m3 (24) 11.0 μg/m3 (46) 46.0
 
March 25, 2019, 4 a.m. 6.2 ppb (6) 0.0 ppb (0) 7.0 ppb (6) 6.0 ppb (6) 7.0 ppb (6) 0.0 ppb (0) 38.0 ppb (29) 0.24 ppb (3) 21.0 μg/m3 (19) 13.0 μg/m3 (52) 52.0
 
March 25, 2019, 3 a.m. 6.0 ppb (6) 0.0 ppb (0) 6.6 ppb (6) 6.0 ppb (6) 6.6 ppb (6) 0.0 ppb (0) 40.0 ppb (31) 0.21 ppb (2) 20.0 μg/m3 (18) 13.0 μg/m3 (52) 52.0
 
March 25, 2019, 2 a.m. 5.6 ppb (5) -0.1 ppb (0) 6.2 ppb (6) 6.0 ppb (6) 6.2 ppb (6) 0.0 ppb (0) 41.0 ppb (32) 0.21 ppb (2) 16.0 μg/m3 (15) 9.0 μg/m3 (38) 38.0
 
March 25, 2019, 1 a.m. 6.3 ppb (6) 0.0 ppb (0) 7.1 ppb (7) 6.0 ppb (6) 6.9 ppb (6) 0.0 ppb (0) 49.0 ppb (38) 0.24 ppb (3) 29.0 μg/m3 (26) 11.0 μg/m3 (46) 46.0
 
March 25, 2019, midnight 6.8 ppb (6) 0.3 ppb (0) 6.8 ppb (6) 7.0 ppb (6) 6.3 ppb (6) 0.0 ppb (0) 51.0 ppb (39) 0.24 ppb (3) 28.0 μg/m3 (25) 16.0 μg/m3 (59) 59.0
 
March 24, 2019, 11 p.m. 6.9 ppb (6) 0.5 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 50.0 ppb (38) 0.24 ppb (3) 25.0 μg/m3 (23) 16.0 μg/m3 (59) 59.0
 
March 24, 2019, 10 p.m. 8.5 ppb (8) 0.8 ppb (1) 10.3 ppb (10) 8.0 ppb (7) 9.1 ppb (8) 0.0 ppb (0) 51.0 ppb (39) 0.25 ppb (3) 27.0 μg/m3 (25) 17.0 μg/m3 (61) 61.0
 
March 24, 2019, 9 p.m. 9.1 ppb (8) 1.2 ppb (1) 10.6 ppb (10) 8.0 ppb (7) 9.0 ppb (8) 0.0 ppb (0) 47.0 ppb (36) 0.25 ppb (3) 35.0 μg/m3 (32) 15.0 μg/m3 (56) 56.0
 
March 24, 2019, 8 p.m. 6.2 ppb (6) 0.8 ppb (1) 7.5 ppb (7) 5.0 ppb (5) 6.5 ppb (6) 0.0 ppb (0) 48.0 ppb (37) 0.22 ppb (2) 25.0 μg/m3 (23) 13.0 μg/m3 (52) 52.0
 
March 24, 2019, 7 p.m. 6.3 ppb (6) 1.1 ppb (1) 7.5 ppb (7) 5.0 ppb (5) 6.3 ppb (6) 0.0 ppb (0) 42.0 ppb (32) 0.2 ppb (2) 26.0 μg/m3 (24) 11.0 μg/m3 (46) 46.0
 
March 24, 2019, 6 p.m. 6.4 ppb (6) 1.4 ppb (1) 7.5 ppb (7) 5.0 ppb (5) 6.0 ppb (6) 0.0 ppb (0) 37.0 ppb (28) 0.2 ppb (2) 22.0 μg/m3 (20) 9.0 μg/m3 (38) 38.0
 
March 24, 2019, 5 p.m. 7.7 ppb (7) 1.8 ppb (2) 8.5 ppb (8) 6.0 ppb (6) 6.5 ppb (6) 0.0 ppb (0) 31.0 ppb (24) 0.19 ppb (2) 21.0 μg/m3 (19) 12.0 μg/m3 (50) 50.0
 
March 24, 2019, 4 p.m. 9.7 ppb (9) 3.0 ppb (3) 10.4 ppb (10) 7.0 ppb (6) 7.4 ppb (7) 0.0 ppb (0) 24.0 ppb (18) 0.26 ppb (3) 22.0 μg/m3 (20) 14.0 μg/m3 (54) 54.0
 
March 24, 2019, 3 p.m. 27.0 ppb (25) 11.8 ppb (11) 26.8 ppb (25) 15.0 ppb (14) 14.9 ppb (14) 0.0 ppb (0) 9.0 ppb (7) 0.45 ppb (5) 23.0 μg/m3 (21) 12.0 μg/m3 (50) 50.0
 
March 24, 2019, 2 p.m. 38.9 ppb (36) 19.5 ppb (18) 38.1 ppb (35) 19.0 ppb (18) 18.7 ppb (17) 0.0 ppb (0) 2.0 ppb (2) 0.53 ppb (6) 23.0 μg/m3 (21) 13.0 μg/m3 (52) 52.0
 
March 24, 2019, 1 p.m. 30.1 ppb (28) 11.0 ppb (10) 27.7 ppb (26) 19.0 ppb (18) 17.5 ppb (16) 0.0 ppb (0) 1.0 ppb (1) 0.45 ppb (5) 20.0 μg/m3 (18) 14.0 μg/m3 (54) 54.0
 
March 24, 2019, noon 30.0 ppb (28) 12.6 ppb (12) 30.2 ppb (28) 17.0 ppb (16) 17.4 ppb (16) 0.0 ppb (0) 1.0 ppb (1) 0.51 ppb (6) 17.0 μg/m3 (15) 10.0 μg/m3 (42) 42.0
 
March 24, 2019, 11 a.m. 17.7 ppb (16) 2.6 ppb (2) 18.7 ppb (17) 15.0 ppb (14) 15.6 ppb (14) 0.0 ppb (0) 3.0 ppb (2) 0.39 ppb (4) 22.0 μg/m3 (20) 14.0 μg/m3 (54) 54.0
 
March 24, 2019, 10 a.m. 21.4 ppb (20) 4.7 ppb (4) 22.9 ppb (21) 17.0 ppb (16) 18.9 ppb (18) 0.0 ppb (0) 2.0 ppb (2) 0.48 ppb (5) 19.0 μg/m3 (17) 12.0 μg/m3 (50) 50.0
 
March 24, 2019, 9 a.m. 20.8 ppb (19) 1.6 ppb (1) 20.6 ppb (19) 19.0 ppb (18) 19.4 ppb (18) 0.0 ppb (0) 4.0 ppb (3) 0.45 ppb (5) 15.0 μg/m3 (14) 9.0 μg/m3 (38) 38.0
 
March 24, 2019, 8 a.m. 20.7 ppb (19) 1.7 ppb (2) 19.3 ppb (18) 19.0 ppb (18) 18.6 ppb (17) 0.0 ppb (0) 10.0 ppb (8) 0.34 ppb (4) 26.0 μg/m3 (24) 8.0 μg/m3 (33) 33.0
 
March 24, 2019, 7 a.m. 12.0 ppb (11) 0.5 ppb (0) 13.0 ppb (12) 11.0 ppb (10) 13.0 ppb (12) 0.0 ppb (0) 21.0 ppb (16) 0.26 ppb (3) 22.0 μg/m3 (20) 9.0 μg/m3 (38) 38.0
 
March 24, 2019, 6 a.m. 20.1 ppb (19) 1.2 ppb (1) 21.1 ppb (20) 19.0 ppb (18) 20.3 ppb (19) 0.0 ppb (0) 9.0 ppb (7) 0.41 ppb (5) 19.0 μg/m3 (17) 13.0 μg/m3 (52) 52.0
 
March 24, 2019, 5 a.m. 9.8 ppb (9) 0.2 ppb (0) 10.5 ppb (10) 10.0 ppb (9) 10.5 ppb (10) 0.0 ppb (0) 19.0 ppb (15) 0.29 ppb (3) 11.0 μg/m3 (10) 3.0 μg/m3 (12) 15.0
 
March 24, 2019, 4 a.m. 5.0 ppb (5) -0.1 ppb (0) 5.6 ppb (5) 5.0 ppb (5) 5.6 ppb (5) 0.0 ppb (0) 27.0 ppb (21) 0.21 ppb (2) 12.0 μg/m3 (11) 3.0 μg/m3 (12) 21.0
 
March 24, 2019, 3 a.m. 3.7 ppb (3) -0.1 ppb (0) 4.2 ppb (4) 4.0 ppb (4) 4.2 ppb (4) 0.0 ppb (0) 29.0 ppb (22) 0.16 ppb (2) 16.0 μg/m3 (15) 5.0 μg/m3 (21) 22.0
 
March 24, 2019, 2 a.m. 3.6 ppb (3) -0.1 ppb (0) 4.3 ppb (4) 4.0 ppb (4) 4.2 ppb (4) 0.0 ppb (0) 29.0 ppb (22) 0.16 ppb (2) 11.0 μg/m3 (10) 6.0 μg/m3 (25) 25.0
 
March 24, 2019, 1 a.m. 3.6 ppb (3) 0.0 ppb (0) 4.3 ppb (4) 4.0 ppb (4) 4.0 ppb (4) 0.0 ppb (0) 30.0 ppb (23) 0.15 ppb (2) 13.0 μg/m3 (12) 6.0 μg/m3 (25) 25.0
 
March 24, 2019, midnight 3.4 ppb (3) 0.1 ppb (0) 4.2 ppb (4) 3.0 ppb (3) 3.8 ppb (4) 0.0 ppb (0) 32.0 ppb (25) 0.15 ppb (2) 15.0 μg/m3 (14) 5.0 μg/m3 (21) 25.0
 
March 23, 2019, 11 p.m. 3.9 ppb (4) 0.2 ppb (0) 4.9 ppb (5) 4.0 ppb (4) 4.4 ppb (4) 0.0 ppb (0) 39.0 ppb (30) 0.17 ppb (2) 16.0 μg/m3 (15) 6.0 μg/m3 (25) 30.0
 
March 23, 2019, 10 p.m. 5.4 ppb (5) 0.4 ppb (0) 6.4 ppb (6) 5.0 ppb (5) 5.8 ppb (5) 0.0 ppb (0) 44.0 ppb (34) 0.18 ppb (2) 21.0 μg/m3 (19) 9.0 μg/m3 (38) 38.0
 
March 23, 2019, 9 p.m. 11.7 ppb (11) 2.7 ppb (3) 12.2 ppb (11) 9.0 ppb (8) 8.3 ppb (8) 0.0 ppb (0) 39.0 ppb (30) 0.19 ppb (2) 25.0 μg/m3 (23) 11.0 μg/m3 (46) 46.0
 
March 23, 2019, 8 p.m. 10.2 ppb (9) 1.9 ppb (2) 12.0 ppb (11) 8.0 ppb (7) 9.4 ppb (9) 0.0 ppb (0) 39.0 ppb (30) 0.22 ppb (2) 27.0 μg/m3 (25) 11.0 μg/m3 (46) 46.0
 
March 23, 2019, 7 p.m. 16.2 ppb (15) 3.8 ppb (4) 17.2 ppb (16) 12.0 ppb (11) 12.7 ppb (12) 0.0 ppb (0) 33.0 ppb (25) 0.26 ppb (3) 28.0 μg/m3 (25) 14.0 μg/m3 (54) 54.0
 
March 23, 2019, 6 p.m. 13.0 ppb (12) 3.1 ppb (3) 14.0 ppb (13) 10.0 ppb (9) 10.2 ppb (9) 0.0 ppb (0) 32.0 ppb (25) 0.24 ppb (3) 31.0 μg/m3 (28) 11.0 μg/m3 (46) 46.0
 
March 23, 2019, 5 p.m. 13.2 ppb (12) 3.4 ppb (3) 13.4 ppb (12) 10.0 ppb (9) 9.7 ppb (9) 0.0 ppb (0) 28.0 ppb (22) 0.22 ppb (2) 42.0 μg/m3 (38) 12.0 μg/m3 (50) 50.0
 
March 23, 2019, 4 p.m. 14.0 ppb (13) 2.6 ppb (2) 14.6 ppb (14) 11.0 ppb (10) 11.9 ppb (11) 0.0 ppb (0) 20.0 ppb (15) 0.27 ppb (3) 69.0 μg/m3 (57) 27.0 μg/m3 (82) 82.0
 
March 23, 2019, 3 p.m. 14.4 ppb (13) 2.5 ppb (2) 14.5 ppb (13) 12.0 ppb (11) 12.5 ppb (12) 0.0 ppb (0) 15.0 ppb (12) 0.28 ppb (3) 21.0 μg/m3 (19) 13.0 μg/m3 (52) 52.0
 
March 23, 2019, 2 p.m. 18.0 ppb (17) 2.9 ppb (3) 17.5 ppb (16) 15.0 ppb (14) 15.6 ppb (14) 0.0 ppb (0) 10.0 ppb (8) 0.31 ppb (3) 33.0 μg/m3 (30) 14.0 μg/m3 (54) 54.0
 
March 23, 2019, 1 p.m. 22.2 ppb (21) 4.0 ppb (4) 18.3 ppb (17) 18.0 ppb (17) 15.5 ppb (14) 0.0 ppb (0) 7.0 ppb (5) 0.33 ppb (4) 28.0 μg/m3 (25) 13.0 μg/m3 (52) 52.0
 
March 23, 2019, noon 28.8 ppb (27) 7.4 ppb (7) 27.4 ppb (25) 21.0 ppb (19) 22.0 ppb (20) 0.0 ppb (0) 6.0 ppb (5) 0.39 ppb (4) 24.0 μg/m3 (22) 11.0 μg/m3 (46) 46.0
 
March 23, 2019, 11 a.m. 30.8 ppb (29) 8.9 ppb (8) 27.3 ppb (25) 22.0 ppb (20) 19.9 ppb (18) 0.0 ppb (0) 5.0 ppb (4) 0.38 ppb (4) 28.0 μg/m3 (25) 12.0 μg/m3 (50) 50.0
 
March 23, 2019, 10 a.m. 24.8 ppb (23) 2.3 ppb (2) 26.1 ppb (24) 23.0 ppb (21) 24.3 ppb (23) 0.0 ppb (0) 4.0 ppb (3) 0.48 ppb (5) 27.0 μg/m3 (25) 14.0 μg/m3 (54) 54.0
 
March 23, 2019, 9 a.m. 34.8 ppb (32) 7.8 ppb (7) 28.6 ppb (26) 27.0 ppb (25) 24.9 ppb (23) 0.0 ppb (0) 2.0 ppb (2) 0.51 ppb (6) 24.0 μg/m3 (22) 11.0 μg/m3 (46) 46.0
 
March 23, 2019, 8 a.m. 38.7 ppb (36) 11.2 ppb (10) 34.1 ppb (32) 27.0 ppb (25) 28.6 ppb (26) 0.0 ppb (0) 2.0 ppb (2) 0.56 ppb (6) 24.0 μg/m3 (22) 12.0 μg/m3 (50) 50.0
 
March 23, 2019, 7 a.m. 38.4 ppb (36) 9.0 ppb (8) 38.3 ppb (35) 29.0 ppb (27) 30.4 ppb (28) 0.0 ppb (0) 3.0 ppb (2) 0.55 ppb (6) 27.0 μg/m3 (25) 11.0 μg/m3 (46) 46.0
 
March 23, 2019, 6 a.m. 25.4 ppb (24) 1.3 ppb (1) 24.8 ppb (23) 24.0 ppb (22) 24.3 ppb (23) 0.0 ppb (0) 12.0 ppb (9) 0.36 ppb (4) 39.0 μg/m3 (35) 7.0 μg/m3 (29) 35.0
 
March 23, 2019, 5 a.m. 13.5 ppb (12) 0.4 ppb (0) 17.1 ppb (16) 13.0 ppb (12) 16.4 ppb (15) 0.0 ppb (0) 23.0 ppb (18) 0.3 ppb (3) 17.0 μg/m3 (15) 8.0 μg/m3 (33) 33.0
 
March 23, 2019, 4 a.m. 10.0 ppb (9) 0.2 ppb (0) 10.4 ppb (10) 10.0 ppb (9) 10.3 ppb (10) 0.0 ppb (0) 29.0 ppb (22) 0.22 ppb (2) 17.0 μg/m3 (15) 6.0 μg/m3 (25) 25.0
 
March 23, 2019, 3 a.m. 6.3 ppb (6) 0.0 ppb (0) 6.9 ppb (6) 6.0 ppb (6) 6.9 ppb (6) 0.0 ppb (0) 35.0 ppb (27) 0.2 ppb (2) 12.0 μg/m3 (11) 5.0 μg/m3 (21) 27.0
 
March 23, 2019, 2 a.m. 5.2 ppb (5) -0.1 ppb (0) 5.8 ppb (5) 5.0 ppb (5) 5.7 ppb (5) 0.0 ppb (0) 37.0 ppb (28) 0.19 ppb (2) 12.0 μg/m3 (11) 5.0 μg/m3 (21) 28.0
 
March 23, 2019, 1 a.m. 5.3 ppb (5) 0.0 ppb (0) 5.8 ppb (5) 5.0 ppb (5) 5.6 ppb (5) 0.0 ppb (0) 41.0 ppb (32) 0.19 ppb (2) 16.0 μg/m3 (15) 7.0 μg/m3 (29) 32.0
 
March 23, 2019, midnight 5.7 ppb (5) 0.4 ppb (0) 6.4 ppb (6) 5.0 ppb (5) 5.7 ppb (5) 0.0 ppb (0) 42.0 ppb (32) 0.2 ppb (2) 14.0 μg/m3 (13) 6.0 μg/m3 (25) 32.0
 
March 22, 2019, 11 p.m. 7.2 ppb (7) 0.9 ppb (1) 8.0 ppb (7) 6.0 ppb (6) 6.8 ppb (6) 0.0 ppb (0) 45.0 ppb (35) 0.22 ppb (2) 18.0 μg/m3 (16) 7.0 μg/m3 (29) 35.0
 
March 22, 2019, 10 p.m. 10.1 ppb (9) 1.5 ppb (1) 10.7 ppb (10) 9.0 ppb (8) 8.8 ppb (8) 0.0 ppb (0) 46.0 ppb (35) 0.25 ppb (3) 24.0 μg/m3 (22) 10.0 μg/m3 (42) 42.0
 
March 22, 2019, 9 p.m. 10.0 ppb (9) 1.7 ppb (2) 10.7 ppb (10) 8.0 ppb (7) 8.6 ppb (8) 0.0 ppb (0) 44.0 ppb (34) 0.25 ppb (3) 19.0 μg/m3 (17) 7.0 μg/m3 (29) 34.0
 
March 22, 2019, 8 p.m. 10.4 ppb (10) 1.9 ppb (2) 11.1 ppb (10) 8.0 ppb (7) 8.7 ppb (8) 0.0 ppb (0) 43.0 ppb (33) 0.25 ppb (3) 16.0 μg/m3 (15) 9.0 μg/m3 (38) 38.0
 
March 22, 2019, 7 p.m. 13.0 ppb (12) 3.1 ppb (3) 13.8 ppb (13) 10.0 ppb (9) 10.3 ppb (10) 0.0 ppb (0) 38.0 ppb (29) 0.26 ppb (3) 26.0 μg/m3 (24) 12.0 μg/m3 (50) 50.0
 
March 22, 2019, 6 p.m. 23.6 ppb (22) 7.0 ppb (6) 23.5 ppb (22) 17.0 ppb (16) 15.9 ppb (15) 0.0 ppb (0) 31.0 ppb (24) 0.3 ppb (3) 32.0 μg/m3 (29) 12.0 μg/m3 (50) 50.0
 
March 22, 2019, 5 p.m. 25.1 ppb (23) 7.2 ppb (7) 25.7 ppb (24) 18.0 ppb (17) 17.6 ppb (16) 0.0 ppb (0) 27.0 ppb (21) 0.27 ppb (3) 22.0 μg/m3 (20) 9.0 μg/m3 (38) 38.0
 
March 22, 2019, 4 p.m. 36.1 ppb (33) 13.5 ppb (12) 35.9 ppb (33) 23.0 ppb (21) 21.7 ppb (20) 0.0 ppb (0) 17.0 ppb (13) 0.39 ppb (4) 29.0 μg/m3 (26) 13.0 μg/m3 (52) 52.0
 
March 22, 2019, 3 p.m. 61.0 ppb (57) 35.6 ppb (33) 59.7 ppb (56) 25.0 ppb (23) 22.9 ppb (21) 0.0 ppb (0) 5.0 ppb (4) 0.58 ppb (6) 29.0 μg/m3 (26) 11.0 μg/m3 (46) 57.0
 
March 22, 2019, 2 p.m. 70.9 ppb (68) 45.8 ppb (42) 68.8 ppb (66) 25.0 ppb (23) 21.4 ppb (20) 0.0 ppb (0) 1.0 ppb (1) 0.75 ppb (8) 31.0 μg/m3 (28) 9.0 μg/m3 (38) 68.0
 
March 22, 2019, 1 p.m. 52.1 ppb (48) 27.9 ppb (26) 53.2 ppb (49) 24.0 ppb (22) 19.5 ppb (18) 0.0 ppb (0) 1.0 ppb (1) 0.57 ppb (6) 21.0 μg/m3 (19) 10.0 μg/m3 (42) 49.0
 
March 22, 2019, noon 50.0 ppb (46) 22.8 ppb (21) 44.7 ppb (41) 27.0 ppb (25) 27.2 ppb (25) 0.0 ppb (0) 1.0 ppb (1) 0.5 ppb (6) 18.0 μg/m3 (16) 8.0 μg/m3 (33) 46.0
 
March 22, 2019, 11 a.m. 15.2 ppb (14) 1.4 ppb (1) 18.5 ppb (17) 14.0 ppb (13) 16.4 ppb (15) 0.0 ppb (0) 17.0 ppb (13) 0.28 ppb (3) 17.0 μg/m3 (15) 7.0 μg/m3 (29) 29.0
 
March 22, 2019, 10 a.m. 15.5 ppb (14) 1.2 ppb (1) 13.3 ppb (12) 14.0 ppb (13) 13.0 ppb (12) 0.0 ppb (0) 18.0 ppb (14) 0.29 ppb (3) 16.0 μg/m3 (15) 6.0 μg/m3 (25) 25.0
 
March 22, 2019, 9 a.m. 19.9 ppb (18) 3.8 ppb (4) 12.4 ppb (11) 16.0 ppb (15) 12.0 ppb (11) 0.0 ppb (0) 15.0 ppb (12) 0.35 ppb (4) 15.0 μg/m3 (14) 7.0 μg/m3 (29) 29.0
 
March 22, 2019, 8 a.m. 46.2 ppb (43) 20.3 ppb (19) 46.1 ppb (43) 26.0 ppb (24) 26.6 ppb (25) 0.0 ppb (0) 1.0 ppb (1) 0.62 ppb (7) 17.0 μg/m3 (15) 11.0 μg/m3 (46) 46.0
 
March 22, 2019, 7 a.m. 44.2 ppb (41) 14.7 ppb (14) 45.7 ppb (42) 29.0 ppb (27) 30.1 ppb (28) 0.0 ppb (0) 1.0 ppb (1) 0.64 ppb (7) 24.0 μg/m3 (22) 11.0 μg/m3 (46) 46.0
 
March 22, 2019, 6 a.m. 33.9 ppb (31) 5.2 ppb (5) 34.7 ppb (32) 29.0 ppb (27) 30.5 ppb (28) 0.0 ppb (0) 3.0 ppb (2) 0.61 ppb (7) 22.0 μg/m3 (20) 7.0 μg/m3 (29) 32.0
 
March 22, 2019, 5 a.m. 25.4 ppb (24) 2.4 ppb (2) 25.9 ppb (24) 23.0 ppb (21) 24.0 ppb (22) 0.0 ppb (0) 12.0 ppb (9) 0.62 ppb (7) 23.0 μg/m3 (21) 7.0 μg/m3 (29) 29.0
 
March 22, 2019, 4 a.m. 11.7 ppb (11) 0.1 ppb (0) 12.2 ppb (11) 12.0 ppb (11) 12.1 ppb (11) 0.0 ppb (0) 30.0 ppb (23) 0.33 ppb (4) 16.0 μg/m3 (15) 6.0 μg/m3 (25) 25.0
 
March 22, 2019, 3 a.m. 6.7 ppb (6) -0.1 ppb (0) 7.1 ppb (7) 7.0 ppb (6) 7.1 ppb (7) 0.0 ppb (0) 39.0 ppb (30) 0.2 ppb (2) 11.0 μg/m3 (10) 4.0 μg/m3 (17) 30.0
 
March 22, 2019, 2 a.m. 5.5 ppb (5) -0.1 ppb (0) 5.8 ppb (5) 6.0 ppb (6) 5.8 ppb (5) 0.0 ppb (0) 40.0 ppb (31) 0.19 ppb (2) 7.0 μg/m3 (6) 2.0 μg/m3 (8) 31.0
 
March 22, 2019, 1 a.m. 4.9 ppb (5) 0.0 ppb (0) 5.2 ppb (5) 5.0 ppb (5) 5.0 ppb (5) 0.0 ppb (0) 38.0 ppb (29) 0.18 ppb (2) 7.0 μg/m3 (6) 2.0 μg/m3 (8) 29.0
 
March 22, 2019, midnight 4.8 ppb (4) 0.3 ppb (0) 5.1 ppb (5) 5.0 ppb (5) 4.5 ppb (4) 0.0 ppb (0) 40.0 ppb (31) 0.17 ppb (2) 6.0 μg/m3 (5) 5.0 μg/m3 (21) 31.0
 
March 21, 2019, 11 p.m. 7.7 ppb (7) 1.2 ppb (1) 8.0 ppb (7) 7.0 ppb (6) 6.5 ppb (6) 0.0 ppb (0) 40.0 ppb (31) 0.19 ppb (2) 10.0 μg/m3 (9) 4.0 μg/m3 (17) 31.0
 
March 21, 2019, 10 p.m. 15.6 ppb (14) 3.1 ppb (3) 15.8 ppb (15) 12.0 ppb (11) 12.1 ppb (11) 0.0 ppb (0) 35.0 ppb (27) 0.24 ppb (3) 15.0 μg/m3 (14) 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 9 p.m. 21.6 ppb (20) 4.0 ppb (4) 21.0 ppb (19) 18.0 ppb (17) 16.2 ppb (15) 0.0 ppb (0) 29.0 ppb (22) 0.28 ppb (3) 16.0 μg/m3 (15) 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 8 p.m. 15.0 ppb (14) 2.8 ppb (3) 15.4 ppb (14) 12.0 ppb (11) 12.1 ppb (11) 0.0 ppb (0) 35.0 ppb (27) 0.21 ppb (2) 20.0 μg/m3 (18) 6.0 μg/m3 (25) 27.0
 
March 21, 2019, 7 p.m. 15.8 ppb (15) 2.7 ppb (3) 16.0 ppb (15) 13.0 ppb (12) 13.1 ppb (12) 0.0 ppb (0) 34.0 ppb (26) 0.22 ppb (2) 17.0 μg/m3 (15) 5.0 μg/m3 (21) 26.0
 
March 21, 2019, 6 p.m. 15.8 ppb (15) 2.3 ppb (2) 15.8 ppb (15) 14.0 ppb (13) 13.4 ppb (12) 0.0 ppb (0) 34.0 ppb (26) 0.22 ppb (2) 21.0 μg/m3 (19) 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 5 p.m. 29.0 ppb (27) 7.3 ppb (7) 28.3 ppb (26) 22.0 ppb (20) 20.3 ppb (19) 0.0 ppb (0) 25.0 ppb (19) 0.33 ppb (4) 30.0 μg/m3 (27) 11.0 μg/m3 (46) 46.0
 
March 21, 2019, 4 p.m. 52.2 ppb (48) 19.2 ppb (18) 50.0 ppb (46) 30.0 ppb (28) 29.3 ppb (27) 0.0 ppb (0) 13.0 ppb (10) 0.41 ppb (5) 37.0 μg/m3 (34) 12.0 μg/m3 (50) 50.0
 
March 21, 2019, 3 p.m. 53.2 ppb (49) 22.3 ppb (21) 49.9 ppb (46) 31.0 ppb (29) 29.4 ppb (27) 0.0 ppb (0) 6.0 ppb (5) 0.47 ppb (5) 36.0 μg/m3 (33) 14.0 μg/m3 (54) 54.0
 
March 21, 2019, 2 p.m. 62.6 ppb (59) 30.6 ppb (28) 58.6 ppb (55) 32.0 ppb (30) 28.9 ppb (27) 0.0 ppb (0) 2.0 ppb (2) 0.61 ppb (7) 32.0 μg/m3 (29) 8.0 μg/m3 (33) 59.0
 
March 21, 2019, 1 p.m. 46.6 ppb (43) 16.6 ppb (15) 43.7 ppb (40) 30.0 ppb (28) 26.2 ppb (24) 0.0 ppb (0) 1.0 ppb (1) 0.51 ppb (6) 22.0 μg/m3 (20) 8.0 μg/m3 (33) 43.0
 
March 21, 2019, noon 45.6 ppb (42) 22.0 ppb (20) 35.7 ppb (33) 24.0 ppb (22) 19.6 ppb (18) 0.0 ppb (0) 2.0 ppb (2) 0.38 ppb (4) 20.0 μg/m3 (18) 8.0 μg/m3 (33) 42.0
 
March 21, 2019, 11 a.m. 26.7 ppb (25) 4.2 ppb (4) 26.3 ppb (24) 22.0 ppb (20) 21.1 ppb (20) 0.0 ppb (0) 4.0 ppb (3) 0.32 ppb (4) 19.0 μg/m3 (17) 10.0 μg/m3 (42) 42.0
 
March 21, 2019, 10 a.m. 25.3 ppb (23) 2.7 ppb (3) 22.8 ppb (21) 23.0 ppb (21) 22.0 ppb (20) 0.0 ppb (0) 4.0 ppb (3) 0.31 ppb (3) 13.0 μg/m3 (12) 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 9 a.m. 18.6 ppb (17) 0.6 ppb (1) 17.6 ppb (16) 18.0 ppb (17) 17.5 ppb (16) 0.0 ppb (0) 11.0 ppb (8) 0.31 ppb (3) 14.0 μg/m3 (13) 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 8 a.m. 22.6 ppb (21) 1.5 ppb (1) 23.3 ppb (22) 21.0 ppb (19) 22.0 ppb (20) 0.0 ppb (0) 11.0 ppb (8) 0.34 ppb (4) 19.0 μg/m3 (17) 5.0 μg/m3 (21) 22.0
 
March 21, 2019, 7 a.m. 20.0 ppb (19) 2.0 ppb (2) 22.1 ppb (20) 18.0 ppb (17) 20.4 ppb (19) 0.0 ppb (0) 17.0 ppb (13) 0.37 ppb (4) 17.0 μg/m3 (15) 7.0 μg/m3 (29) 29.0
 
March 21, 2019, 6 a.m. 26.0 ppb (24) 3.9 ppb (4) 26.5 ppb (25) 22.0 ppb (20) 23.6 ppb (22) 0.0 ppb (0) 10.0 ppb (8) 0.59 ppb (7) 17.0 μg/m3 (15) 8.0 μg/m3 (33) 33.0
 
March 21, 2019, 5 a.m. 26.0 ppb (24) 1.3 ppb (1) 28.0 ppb (26) 25.0 ppb (23) 26.7 ppb (25) 0.0 ppb (0) 11.0 ppb (8) 0.51 ppb (6) 22.0 μg/m3 (20) 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 4 a.m. 13.9 ppb (13) 0.4 ppb (0) 14.1 ppb (13) 14.0 ppb (13) 13.9 ppb (13) 0.0 ppb (0) 27.0 ppb (21) 0.38 ppb (4) 18.0 μg/m3 (16) 6.0 μg/m3 (25) 25.0
 
March 21, 2019, 3 a.m. 6.0 ppb (6) -0.1 ppb (0) 6.7 ppb (6) 6.0 ppb (6) 6.7 ppb (6) 0.0 ppb (0) 38.0 ppb (29) 0.17 ppb (2) 13.0 μg/m3 (12) 2.0 μg/m3 (8) 29.0
 
March 21, 2019, 2 a.m. 4.9 ppb (5) -0.2 ppb (0) 5.5 ppb (5) 5.0 ppb (5) 5.5 ppb (5) 0.0 ppb (0) 39.0 ppb (30) 0.17 ppb (2) 12.0 μg/m3 (11) 3.0 μg/m3 (12) 30.0
 
March 21, 2019, 1 a.m. 4.0 ppb (4) -0.1 ppb (0) 4.4 ppb (4) 4.0 ppb (4) 4.3 ppb (4) 0.0 ppb (0) 42.0 ppb (32) 0.15 ppb (2) 12.0 μg/m3 (11) -2.0 μg/m3 (0) 32.0
 
March 21, 2019, midnight 6.8 ppb (6) 0.6 ppb (1) 7.3 ppb (7) 6.0 ppb (6) 6.4 ppb (6) 0.0 ppb (0) 41.0 ppb (32) 0.17 ppb (2) 12.0 μg/m3 (11) 1.0 μg/m3 (4) 32.0
 
March 20, 2019, 11 p.m. 4.7 ppb (4) 0.6 ppb (1) 5.5 ppb (5) 4.0 ppb (4) 4.6 ppb (4) 0.0 ppb (0) 42.0 ppb (32) 0.17 ppb (2) 11.0 μg/m3 (10) 6.0 μg/m3 (25) 32.0
 
March 20, 2019, 10 p.m. 18.5 ppb (17) 2.5 ppb (2) 18.8 ppb (17) 16.0 ppb (15) 16.0 ppb (15) 0.0 ppb (0) 33.0 ppb (25) 0.29 ppb (3) 24.0 μg/m3 (22) 8.0 μg/m3 (33) 33.0
 
March 20, 2019, 9 p.m. 17.8 ppb (16) 3.2 ppb (3) 18.0 ppb (17) 15.0 ppb (14) 14.4 ppb (13) N/A 35.0 ppb (27) N/A 18.0 μg/m3 (16) 11.0 μg/m3 (46) 46.0
 
March 20, 2019, 8 p.m. 12.6 ppb (12) 1.4 ppb (1) 13.1 ppb (12) 11.0 ppb (10) 11.4 ppb (11) N/A 35.0 ppb (27) N/A 19.0 μg/m3 (17) 9.0 μg/m3 (38) 38.0
 
March 20, 2019, 7 p.m. 13.8 ppb (13) 2.5 ppb (2) 14.1 ppb (13) 11.0 ppb (10) 11.2 ppb (10) 0.0 ppb (0) 34.0 ppb (26) 0.26 ppb (3) 12.0 μg/m3 (11) 6.0 μg/m3 (25) 26.0
 
March 20, 2019, 6 p.m. 13.4 ppb (12) 2.6 ppb (2) 13.6 ppb (13) 11.0 ppb (10) 10.6 ppb (10) 0.0 ppb (0) 34.0 ppb (26) N/A 17.0 μg/m3 (15) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 5 p.m. 19.9 ppb (18) 6.4 ppb (6) 19.8 ppb (18) 14.0 ppb (13) 12.3 ppb (11) 0.0 ppb (0) 29.0 ppb (22) 0.22 ppb (2) 28.0 μg/m3 (25) 11.0 μg/m3 (46) 46.0
 
March 20, 2019, 4 p.m. 16.7 ppb (15) 4.2 ppb (4) 16.5 ppb (15) 12.0 ppb (11) 10.8 ppb (10) 0.0 ppb (0) 31.0 ppb (24) 0.19 ppb (2) 25.0 μg/m3 (23) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 3 p.m. 22.5 ppb (21) 4.1 ppb (4) 21.4 ppb (20) 18.0 ppb (17) 17.2 ppb (16) 0.0 ppb (0) 24.0 ppb (18) 0.22 ppb (2) 36.0 μg/m3 (33) 11.0 μg/m3 (46) 46.0
 
March 20, 2019, 2 p.m. 26.7 ppb (25) 4.8 ppb (4) 24.8 ppb (23) 22.0 ppb (20) 20.6 ppb (19) 0.0 ppb (0) 18.0 ppb (14) 0.24 ppb (3) 24.0 μg/m3 (22) 9.0 μg/m3 (38) 38.0
 
March 20, 2019, 1 p.m. 19.7 ppb (18) 1.7 ppb (2) 17.5 ppb (16) 18.0 ppb (17) 15.8 ppb (15) 0.0 ppb (0) 23.0 ppb (18) 0.21 ppb (2) 20.0 μg/m3 (18) 11.0 μg/m3 (46) 46.0
 
March 20, 2019, noon 15.0 ppb (14) 1.3 ppb (1) 11.0 ppb (10) 14.0 ppb (13) 10.9 ppb (10) 0.0 ppb (0) 27.0 ppb (21) 0.2 ppb (2) 23.0 μg/m3 (21) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 11 a.m. 8.4 ppb (8) 0.1 ppb (0) 8.5 ppb (8) 8.0 ppb (7) 8.2 ppb (8) 0.0 ppb (0) 32.0 ppb (25) 0.15 ppb (2) 17.0 μg/m3 (15) 7.0 μg/m3 (29) 29.0
 
March 20, 2019, 10 a.m. 9.5 ppb (9) 0.1 ppb (0) 9.4 ppb (9) 9.0 ppb (8) 9.4 ppb (9) 0.0 ppb (0) 31.0 ppb (24) 0.15 ppb (2) 19.0 μg/m3 (17) 6.0 μg/m3 (25) 25.0
 
March 20, 2019, 9 a.m. 10.1 ppb (9) 0.4 ppb (0) 9.9 ppb (9) 10.0 ppb (9) 9.2 ppb (9) 0.0 ppb (0) 32.0 ppb (25) 0.14 ppb (2) 17.0 μg/m3 (15) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 8 a.m. 7.6 ppb (7) 0.2 ppb (0) 7.5 ppb (7) 7.0 ppb (6) 7.5 ppb (7) 0.0 ppb (0) 36.0 ppb (28) 0.15 ppb (2) 20.0 μg/m3 (18) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 7 a.m. 6.7 ppb (6) 0.0 ppb (0) 7.4 ppb (7) 7.0 ppb (6) 7.3 ppb (7) 0.0 ppb (0) 37.0 ppb (28) 0.14 ppb (2) 21.0 μg/m3 (19) 9.0 μg/m3 (38) 38.0
 
March 20, 2019, 6 a.m. 6.9 ppb (6) 0.0 ppb (0) 7.8 ppb (7) 7.0 ppb (6) 7.8 ppb (7) 0.0 ppb (0) 36.0 ppb (28) 0.15 ppb (2) 17.0 μg/m3 (15) 12.0 μg/m3 (50) 50.0
 
March 20, 2019, 5 a.m. 7.7 ppb (7) -0.1 ppb (0) 8.6 ppb (8) 8.0 ppb (7) 8.6 ppb (8) 0.0 ppb (0) 36.0 ppb (28) 0.15 ppb (2) 24.0 μg/m3 (22) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 4 a.m. 9.4 ppb (9) 1.4 ppb (1) 9.2 ppb (9) 8.0 ppb (7) 6.6 ppb (6) 0.0 ppb (0) 37.0 ppb (28) 0.15 ppb (2) 23.0 μg/m3 (21) 13.0 μg/m3 (52) 52.0
 
March 20, 2019, 3 a.m. 8.4 ppb (8) 0.7 ppb (1) 9.7 ppb (9) 8.0 ppb (7) 8.9 ppb (8) 0.0 ppb (0) 35.0 ppb (27) 0.17 ppb (2) 26.0 μg/m3 (24) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 2 a.m. 10.2 ppb (9) 1.0 ppb (1) 11.4 ppb (11) 9.0 ppb (8) 10.4 ppb (10) 0.0 ppb (0) 36.0 ppb (28) 0.17 ppb (2) 28.0 μg/m3 (25) 14.0 μg/m3 (54) 54.0
 
March 20, 2019, 1 a.m. 10.6 ppb (10) 0.3 ppb (0) 11.9 ppb (11) 10.0 ppb (9) 11.5 ppb (11) 0.0 ppb (0) 37.0 ppb (28) 0.17 ppb (2) 32.0 μg/m3 (29) 12.0 μg/m3 (50) 50.0
 
March 20, 2019, midnight 10.1 ppb (9) 0.6 ppb (1) 11.4 ppb (11) 9.0 ppb (8) 10.6 ppb (10) 0.0 ppb (0) 41.0 ppb (32) 0.18 ppb (2) 26.0 μg/m3 (24) 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 11 p.m. 13.2 ppb (12) 1.7 ppb (2) 15.1 ppb (14) 11.0 ppb (10) 13.0 ppb (12) 0.0 ppb (0) 42.0 ppb (32) 0.2 ppb (2) 33.0 μg/m3 (30) 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 10 p.m. 13.9 ppb (13) 1.8 ppb (2) 15.5 ppb (14) 12.0 ppb (11) 13.5 ppb (12) 0.0 ppb (0) 44.0 ppb (34) 0.21 ppb (2) 29.0 μg/m3 (26) 8.0 μg/m3 (33) 34.0
 
March 19, 2019, 9 p.m. 15.6 ppb (14) 2.7 ppb (3) 17.5 ppb (16) 13.0 ppb (12) 14.2 ppb (13) 1.0 ppb (1) 43.0 ppb (33) 0.23 ppb (3) 32.0 μg/m3 (29) 26.0 μg/m3 (80) 80.0
 
March 19, 2019, 8 p.m. 14.5 ppb (13) 2.5 ppb (2) 16.6 ppb (15) 12.0 ppb (11) 13.7 ppb (13) N/A 46.0 ppb (35) N/A 33.0 μg/m3 (30) N/A 35.0
 
March 19, 2019, 7 p.m. 19.4 ppb (18) 3.7 ppb (3) 21.9 ppb (20) 16.0 ppb (15) 17.8 ppb (16) N/A 44.0 ppb (34) N/A 35.0 μg/m3 (32) 17.0 μg/m3 (61) 61.0
 
March 19, 2019, 6 p.m. 36.0 ppb (33) 11.5 ppb (11) 38.4 ppb (36) 24.0 ppb (22) 26.1 ppb (24) N/A 27.0 ppb (21) N/A 46.0 μg/m3 (42) 29.0 μg/m3 (86) 86.0
 
March 19, 2019, 5 p.m. 72.7 ppb (70) 35.6 ppb (33) 74.9 ppb (72) 37.0 ppb (34) 37.8 ppb (35) N/A 11.0 ppb (8) N/A 63.0 μg/m3 (54) 32.0 μg/m3 (93) 93.0
 
March 19, 2019, 4 p.m. 105.5 ppb (101) 60.6 ppb (57) 107.4 ppb (101) 45.0 ppb (42) 43.9 ppb (41) 1.0 ppb (1) 5.0 ppb (4) 1.0 ppb (11) 80.0 μg/m3 (62) 34.0 μg/m3 (97) 101.0
 
March 19, 2019, 3 p.m. 83.9 ppb (82) 47.8 ppb (44) 84.6 ppb (83) 36.0 ppb (33) 35.5 ppb (33) 0.0 ppb (0) 4.0 ppb (3) 0.97 ppb (11) 53.0 μg/m3 (48) 23.0 μg/m3 (73) 83.0
 
March 19, 2019, 2 p.m. 101.2 ppb (100) 67.5 ppb (64) 98.8 ppb (98) 34.0 ppb (31) 32.0 ppb (30) 0.0 ppb (0) 1.0 ppb (1) 1.01 ppb (11) 52.0 μg/m3 (47) 21.0 μg/m3 (69) 100.0
 
March 19, 2019, 1 p.m. 67.1 ppb (64) 36.3 ppb (34) 60.2 ppb (57) 31.0 ppb (29) 26.6 ppb (25) 0.0 ppb (0) 1.0 ppb (1) 0.75 ppb (8) 39.0 μg/m3 (35) 17.0 μg/m3 (61) 64.0
 
March 19, 2019, noon 58.3 ppb (55) 30.4 ppb (28) 48.2 ppb (45) 28.0 ppb (26) 29.0 ppb (27) 0.0 ppb (0) 1.0 ppb (1) 0.66 ppb (7) 30.0 μg/m3 (27) 12.0 μg/m3 (50) 55.0
 
March 19, 2019, 11 a.m. 34.5 ppb (32) 8.5 ppb (8) 33.6 ppb (31) 26.0 ppb (24) 26.0 ppb (24) 0.0 ppb (0) 1.0 ppb (1) 0.5 ppb (6) 33.0 μg/m3 (30) 18.0 μg/m3 (63) 63.0
 
March 19, 2019, 10 a.m. 35.5 ppb (33) 9.9 ppb (9) 38.8 ppb (36) 26.0 ppb (24) 29.1 ppb (27) 0.0 ppb (0) 2.0 ppb (2) 0.46 ppb (5) 38.0 μg/m3 (35) 22.0 μg/m3 (71) 71.0
 
March 19, 2019, 9 a.m. 38.6 ppb (36) 9.4 ppb (9) 38.4 ppb (36) 29.0 ppb (27) 28.3 ppb (26) 0.0 ppb (0) 2.0 ppb (2) 0.46 ppb (5) 41.0 μg/m3 (37) 24.0 μg/m3 (76) 76.0
 
March 19, 2019, 8 a.m. 31.6 ppb (29) 3.2 ppb (3) 33.7 ppb (31) 28.0 ppb (26) 31.7 ppb (29) 0.0 ppb (0) 5.0 ppb (4) 0.46 ppb (5) 33.0 μg/m3 (30) 21.0 μg/m3 (69) 69.0
 
March 19, 2019, 7 a.m. 27.6 ppb (26) 2.0 ppb (2) 29.8 ppb (28) 26.0 ppb (24) 28.7 ppb (27) 0.0 ppb (0) 10.0 ppb (8) 0.46 ppb (5) 31.0 μg/m3 (28) 16.0 μg/m3 (59) 59.0
 
March 19, 2019, 6 a.m. 25.5 ppb (24) 1.0 ppb (1) 28.2 ppb (26) 24.0 ppb (22) 27.8 ppb (26) 0.0 ppb (0) 19.0 ppb (15) 0.33 ppb (4) 33.0 μg/m3 (30) 18.0 μg/m3 (63) 63.0
 
March 19, 2019, 5 a.m. 28.0 ppb (26) 1.8 ppb (2) 30.2 ppb (28) 26.0 ppb (24) 29.2 ppb (27) 0.0 ppb (0) 19.0 ppb (15) 0.32 ppb (4) 34.0 μg/m3 (31) 18.0 μg/m3 (63) 63.0
 
March 19, 2019, 4 a.m. 26.7 ppb (25) 1.0 ppb (1) 27.8 ppb (26) 26.0 ppb (24) 27.5 ppb (25) 0.0 ppb (0) 21.0 ppb (16) 0.35 ppb (4) 35.0 μg/m3 (32) 11.0 μg/m3 (46) 46.0
 
March 19, 2019, 3 a.m. 30.0 ppb (28) 1.0 ppb (1) 31.1 ppb (29) 29.0 ppb (27) 30.5 ppb (28) 1.0 ppb (1) 25.0 ppb (19) 0.39 ppb (4) 37.0 μg/m3 (34) 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 2 a.m. 22.0 ppb (20) 0.1 ppb (0) 23.6 ppb (22) 22.0 ppb (20) 23.4 ppb (22) 0.0 ppb (0) 44.0 ppb (34) 0.34 ppb (4) 33.0 μg/m3 (30) 13.0 μg/m3 (52) 52.0
 
March 19, 2019, 1 a.m. 16.2 ppb (15) 0.4 ppb (0) 17.8 ppb (16) 16.0 ppb (15) 17.1 ppb (16) 0.0 ppb (0) 52.0 ppb (40) 0.29 ppb (3) 27.0 μg/m3 (25) 7.0 μg/m3 (29) 40.0
 
March 19, 2019, midnight 15.7 ppb (15) 1.1 ppb (1) 17.5 ppb (16) 15.0 ppb (14) 16.0 ppb (15) 0.0 ppb (0) 55.0 ppb (42) 0.29 ppb (3) 25.0 μg/m3 (23) 7.0 μg/m3 (29) 42.0
 
March 18, 2019, 11 p.m. 12.8 ppb (12) 0.9 ppb (1) 15.0 ppb (14) 12.0 ppb (11) 13.7 ppb (13) 1.0 ppb (1) 65.0 ppb (50) 0.31 ppb (3) 32.0 μg/m3 (29) 18.0 μg/m3 (63) 63.0
 
March 18, 2019, 10 p.m. 22.6 ppb (21) 2.4 ppb (2) 25.1 ppb (23) 20.0 ppb (19) 22.0 ppb (20) 1.0 ppb (1) 59.0 ppb (45) 0.37 ppb (4) 44.0 μg/m3 (40) 19.0 μg/m3 (65) 65.0
 
March 18, 2019, 9 p.m. 30.5 ppb (28) 4.1 ppb (4) 32.7 ppb (30) 26.0 ppb (24) 27.6 ppb (26) 1.0 ppb (1) 52.0 ppb (40) 0.46 ppb (5) 51.0 μg/m3 (46) 19.0 μg/m3 (65) 65.0
 
March 18, 2019, 8 p.m. 32.4 ppb (30) 4.9 ppb (5) 34.8 ppb (32) 28.0 ppb (26) 28.7 ppb (27) 1.0 ppb (1) 49.0 ppb (38) 0.48 ppb (5) 53.0 μg/m3 (48) 21.0 μg/m3 (69) 69.0
 
March 18, 2019, 7 p.m. 36.8 ppb (34) 7.3 ppb (7) 38.5 ppb (36) 30.0 ppb (28) 29.6 ppb (27) 1.0 ppb (1) 41.0 ppb (32) 0.41 ppb (5) 52.0 μg/m3 (47) 20.0 μg/m3 (67) 67.0
 
March 18, 2019, 6 p.m. 36.1 ppb (33) 9.1 ppb (8) 37.5 ppb (35) 27.0 ppb (25) 26.8 ppb (25) 0.0 ppb (0) 31.0 ppb (24) 0.4 ppb (4) 41.0 μg/m3 (37) 14.0 μg/m3 (54) 54.0
 
March 18, 2019, 5 p.m. 33.1 ppb (31) 10.4 ppb (10) 33.9 ppb (31) 23.0 ppb (21) 24.0 ppb (22) 0.0 ppb (0) 27.0 ppb (21) 0.36 ppb (4) 31.0 μg/m3 (28) 14.0 μg/m3 (54) 54.0
 
March 18, 2019, 4 p.m. 50.6 ppb (47) 20.3 ppb (19) 50.3 ppb (47) 30.0 ppb (28) 29.2 ppb (27) 0.0 ppb (0) 16.0 ppb (12) 0.52 ppb (6) 40.0 μg/m3 (36) 20.0 μg/m3 (67) 67.0
 
March 18, 2019, 3 p.m. 67.2 ppb (64) 32.7 ppb (30) 66.4 ppb (63) 35.0 ppb (32) 32.3 ppb (30) 0.0 ppb (0) 7.0 ppb (5) 0.73 ppb (8) 43.0 μg/m3 (39) 17.0 μg/m3 (61) 64.0
 
March 18, 2019, 2 p.m. 89.8 ppb (88) 53.1 ppb (49) 84.7 ppb (83) 37.0 ppb (34) 33.5 ppb (31) 0.0 ppb (0) 2.0 ppb (2) 0.9 ppb (10) 49.0 μg/m3 (45) 17.0 μg/m3 (61) 88.0
 
March 18, 2019, 1 p.m. 44.6 ppb (41) 10.7 ppb (10) 42.1 ppb (39) 34.0 ppb (31) 30.6 ppb (28) 0.0 ppb (0) 4.0 ppb (3) 0.55 ppb (6) 30.0 μg/m3 (27) 14.0 μg/m3 (54) 54.0
 
March 18, 2019, noon 42.2 ppb (39) 8.3 ppb (8) 41.5 ppb (38) 34.0 ppb (31) 33.9 ppb (31) 0.0 ppb (0) 4.0 ppb (3) 0.54 ppb (6) 32.0 μg/m3 (29) 13.0 μg/m3 (52) 52.0
 
March 18, 2019, 11 a.m. 36.5 ppb (34) 4.7 ppb (4) 38.3 ppb (35) 32.0 ppb (30) 32.2 ppb (30) 0.0 ppb (0) 4.0 ppb (3) 0.43 ppb (5) 29.0 μg/m3 (26) 11.0 μg/m3 (46) 46.0
 
March 18, 2019, 10 a.m. 24.6 ppb (23) 1.2 ppb (1) 25.2 ppb (23) 23.0 ppb (21) 24.9 ppb (23) 0.0 ppb (0) 11.0 ppb (8) 0.41 ppb (5) 23.0 μg/m3 (21) 12.0 μg/m3 (50) 50.0
 
March 18, 2019, 9 a.m. 22.8 ppb (21) 0.9 ppb (1) 23.9 ppb (22) 22.0 ppb (20) 23.8 ppb (22) 0.0 ppb (0) 16.0 ppb (12) 0.41 ppb (5) 27.0 μg/m3 (25) 12.0 μg/m3 (50) 50.0