AQSQID: 060250005

Site Name: Calexico - Ethel Street

Location: Calexico, CA

Reporting: True, Located: True

Current AQI: 54.0

Calexico CA, US: 32.676102, -115.483299

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 25, 2019, 8 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) N/A N/A N/A 16.0 μg/m3 (59) 59.0
 
March 25, 2019, 7 a.m. 20.1 ppb (19) 0.3 ppb (0) N/A 20.0 ppb (19) N/A 0.0 ppb (0) 21.0 ppb (16) 0.39 ppb (4) N/A 14.0 μg/m3 (54) 54.0
 
March 25, 2019, 6 a.m. 19.9 ppb (18) 1.6 ppb (1) N/A 18.0 ppb (17) N/A 0.0 ppb (0) 22.0 ppb (17) 0.33 ppb (4) 34.0 μg/m3 (31) 12.0 μg/m3 (50) 50.0
 
March 25, 2019, 5 a.m. 55.5 ppb (52) 12.8 ppb (12) N/A 43.0 ppb (40) N/A 0.0 ppb (0) 6.0 ppb (5) 0.82 ppb (9) 68.0 μg/m3 (56) 27.0 μg/m3 (82) 82.0
 
March 25, 2019, 3 a.m. 40.6 ppb (38) 1.2 ppb (1) N/A 39.0 ppb (36) N/A 0.0 ppb (0) 18.0 ppb (14) 0.66 ppb (7) 59.0 μg/m3 (52) 18.0 μg/m3 (63) 63.0
 
March 25, 2019, 2 a.m. 14.9 ppb (14) 1.0 ppb (1) N/A 14.0 ppb (13) N/A 0.0 ppb (0) 48.0 ppb (37) 0.3 ppb (3) 39.0 μg/m3 (35) 7.0 μg/m3 (29) 37.0
 
March 25, 2019, 1 a.m. 3.2 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 67.0 ppb (52) 0.16 ppb (2) 15.0 μg/m3 (14) 5.0 μg/m3 (21) 52.0
 
March 25, 2019, midnight 1.6 ppb (1) -0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 69.0 ppb (53) 0.14 ppb (2) 14.0 μg/m3 (13) 8.0 μg/m3 (33) 53.0
 
March 24, 2019, 11 p.m. 1.4 ppb (1) -0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 67.0 ppb (52) 0.13 ppb (1) 13.0 μg/m3 (12) 5.0 μg/m3 (21) 52.0
 
March 24, 2019, 10 p.m. 2.0 ppb (2) -0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 65.0 ppb (50) 0.14 ppb (2) 22.0 μg/m3 (20) 5.0 μg/m3 (21) 50.0
 
March 24, 2019, 9 p.m. 2.3 ppb (2) -0.2 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 65.0 ppb (50) 0.14 ppb (2) 19.0 μg/m3 (17) 6.0 μg/m3 (25) 50.0
 
March 24, 2019, 8 p.m. 2.7 ppb (3) -0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 63.0 ppb (48) 0.15 ppb (2) 24.0 μg/m3 (22) 7.0 μg/m3 (29) 48.0
 
March 24, 2019, 7 p.m. 2.5 ppb (2) -0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 59.0 ppb (45) 0.15 ppb (2) 11.0 μg/m3 (10) 7.0 μg/m3 (29) 45.0
 
March 24, 2019, 6 p.m. 2.6 ppb (2) -0.1 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 55.0 ppb (42) 0.15 ppb (2) 19.0 μg/m3 (17) 7.0 μg/m3 (29) 42.0
 
March 24, 2019, 5 p.m. 2.6 ppb (2) -0.1 ppb (0) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 51.0 ppb (39) 0.15 ppb (2) 22.0 μg/m3 (20) 8.0 μg/m3 (33) 39.0
 
March 24, 2019, 4 p.m. 2.6 ppb (2) -0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 44.0 ppb (34) 0.14 ppb (2) 26.0 μg/m3 (24) 8.0 μg/m3 (33) 34.0
 
March 24, 2019, 3 p.m. 3.5 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 40.0 ppb (31) 0.15 ppb (2) 29.0 μg/m3 (26) 9.0 μg/m3 (38) 38.0
 
March 24, 2019, 2 p.m. 5.4 ppb (5) 0.2 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 35.0 ppb (27) 0.16 ppb (2) 19.0 μg/m3 (17) 8.0 μg/m3 (33) 33.0
 
March 24, 2019, 1 p.m. 2.9 ppb (3) -0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) 0.14 ppb (2) 16.0 μg/m3 (15) 6.0 μg/m3 (25) 32.0
 
March 24, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A 13.0 μg/m3 (12) 7.0 μg/m3 (29) 29.0
 
March 24, 2019, 11 a.m. 1.5 ppb (1) -0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 45.0 ppb (35) 0.12 ppb (1) 11.0 μg/m3 (10) 6.0 μg/m3 (25) 35.0
 
March 24, 2019, 10 a.m. 1.3 ppb (1) -0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (33) 0.12 ppb (1) 8.0 μg/m3 (7) 5.0 μg/m3 (21) 33.0
 
March 24, 2019, 9 a.m. 1.7 ppb (2) -0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 40.0 ppb (31) 0.12 ppb (1) 9.0 μg/m3 (8) 5.0 μg/m3 (21) 31.0
 
March 24, 2019, 8 a.m. 2.2 ppb (2) -0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) 0.12 ppb (1) 8.0 μg/m3 (7) 3.0 μg/m3 (12) 33.0
 
March 24, 2019, 7 a.m. 1.9 ppb (2) -0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 46.0 ppb (35) 0.12 ppb (1) 13.0 μg/m3 (12) 3.0 μg/m3 (12) 35.0
 
March 24, 2019, 6 a.m. 1.6 ppb (1) -0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 46.0 ppb (35) 0.12 ppb (1) 28.0 μg/m3 (25) 5.0 μg/m3 (21) 35.0
 
March 24, 2019, 5 a.m. 1.6 ppb (1) -0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (38) 0.12 ppb (1) 30.0 μg/m3 (27) 4.0 μg/m3 (17) 38.0
 
March 24, 2019, 4 a.m. 2.3 ppb (2) -0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 48.0 ppb (37) 0.13 ppb (1) 13.0 μg/m3 (12) 4.0 μg/m3 (17) 37.0
 
March 24, 2019, 3 a.m. 1.8 ppb (2) -0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 48.0 ppb (37) 0.12 ppb (1) 45.0 μg/m3 (41) 5.0 μg/m3 (21) 41.0
 
March 24, 2019, 2 a.m. 2.3 ppb (2) -0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 49.0 ppb (38) 0.13 ppb (1) 31.0 μg/m3 (28) 4.0 μg/m3 (17) 38.0
 
March 24, 2019, 1 a.m. 2.6 ppb (2) -0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 62.0 ppb (48) 0.15 ppb (2) 18.0 μg/m3 (16) 4.0 μg/m3 (17) 48.0
 
March 24, 2019, midnight 2.6 ppb (2) -0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 64.0 ppb (49) 0.13 ppb (1) 25.0 μg/m3 (23) 5.0 μg/m3 (21) 49.0
 
March 23, 2019, 11 p.m. 1.7 ppb (2) -0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 66.0 ppb (51) 0.13 ppb (1) 29.0 μg/m3 (26) 2.0 μg/m3 (8) 51.0
 
March 23, 2019, 10 p.m. 2.1 ppb (2) -0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 65.0 ppb (50) 0.13 ppb (1) 14.0 μg/m3 (13) 1.0 μg/m3 (4) 50.0
 
March 23, 2019, 9 p.m. 2.3 ppb (2) -0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 67.0 ppb (52) 0.13 ppb (1) 27.0 μg/m3 (25) 5.0 μg/m3 (21) 52.0
 
March 23, 2019, 8 p.m. 6.3 ppb (6) 0.2 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 71.0 ppb (55) 0.19 ppb (2) 34.0 μg/m3 (31) 9.0 μg/m3 (38) 55.0
 
March 23, 2019, 7 p.m. 12.9 ppb (12) 1.2 ppb (1) N/A 12.0 ppb (11) N/A 0.0 ppb (0) 65.0 ppb (50) 0.29 ppb (3) 42.0 μg/m3 (38) 10.0 μg/m3 (42) 50.0
 
March 23, 2019, 6 p.m. 7.8 ppb (7) 0.8 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 58.0 ppb (45) 0.23 ppb (3) 27.0 μg/m3 (25) 3.0 μg/m3 (12) 45.0
 
March 23, 2019, 5 p.m. 4.2 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 51.0 ppb (39) 0.15 ppb (2) 14.0 μg/m3 (13) 2.0 μg/m3 (8) 39.0
 
March 23, 2019, 4 p.m. 7.4 ppb (7) 1.3 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 41.0 ppb (32) 0.19 ppb (2) 17.0 μg/m3 (15) 3.0 μg/m3 (12) 32.0
 
March 23, 2019, 3 p.m. 12.2 ppb (11) 2.4 ppb (2) N/A 10.0 ppb (9) N/A 0.0 ppb (0) 33.0 ppb (25) 0.23 ppb (3) 26.0 μg/m3 (24) 5.0 μg/m3 (21) 25.0
 
March 23, 2019, 2 p.m. 16.9 ppb (16) 2.7 ppb (3) N/A 14.0 ppb (13) N/A 0.0 ppb (0) 19.0 ppb (15) 0.27 ppb (3) 25.0 μg/m3 (23) 8.0 μg/m3 (33) 33.0
 
March 23, 2019, 1 p.m. 15.8 ppb (15) 0.6 ppb (1) N/A 15.0 ppb (14) N/A 0.0 ppb (0) 16.0 ppb (12) 0.26 ppb (3) 21.0 μg/m3 (19) 8.0 μg/m3 (33) 33.0
 
March 23, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A 20.0 μg/m3 (18) 6.0 μg/m3 (25) 25.0
 
March 23, 2019, 11 a.m. 5.8 ppb (5) -0.1 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 32.0 ppb (25) 0.17 ppb (2) 19.0 μg/m3 (17) 6.0 μg/m3 (25) 25.0
 
March 23, 2019, 10 a.m. 3.9 ppb (4) -0.4 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 37.0 ppb (28) 0.17 ppb (2) 12.0 μg/m3 (11) 7.0 μg/m3 (29) 29.0
 
March 23, 2019, 9 a.m. 3.2 ppb (3) -0.4 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 41.0 ppb (32) 0.15 ppb (2) 12.0 μg/m3 (11) 6.0 μg/m3 (25) 32.0
 
March 23, 2019, 8 a.m. 7.8 ppb (7) -0.2 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 35.0 ppb (27) 0.18 ppb (2) 24.0 μg/m3 (22) 6.0 μg/m3 (25) 27.0
 
March 23, 2019, 7 a.m. 28.0 ppb (26) 0.6 ppb (1) N/A 27.0 ppb (25) N/A 0.0 ppb (0) 14.0 ppb (11) 0.49 ppb (5) 77.0 μg/m3 (61) 21.0 μg/m3 (69) 69.0
 
March 23, 2019, 6 a.m. 55.9 ppb (52) 15.1 ppb (14) N/A 41.0 ppb (38) N/A 1.0 ppb (1) 5.0 ppb (4) 0.87 ppb (10) 149.0 μg/m3 (97) 36.0 μg/m3 (101) 101.0
 
March 23, 2019, 5 a.m. 91.5 ppb (90) 41.9 ppb (39) N/A 50.0 ppb (46) N/A 1.0 ppb (1) 2.0 ppb (2) 1.3 ppb (14) 188.0 μg/m3 (116) 33.0 μg/m3 (95) 116.0
 
March 23, 2019, 4 a.m. 86.6 ppb (85) 35.6 ppb (33) N/A 51.0 ppb (47) N/A 1.0 ppb (1) 2.0 ppb (2) 1.27 ppb (14) 122.0 μg/m3 (84) 19.0 μg/m3 (65) 85.0
 
March 23, 2019, 3 a.m. 52.9 ppb (49) 11.2 ppb (10) N/A 42.0 ppb (39) N/A 0.0 ppb (0) 10.0 ppb (8) 0.77 ppb (9) 63.0 μg/m3 (54) 15.0 μg/m3 (56) 56.0
 
March 23, 2019, 2 a.m. 15.2 ppb (14) 0.6 ppb (1) N/A 15.0 ppb (14) N/A 0.0 ppb (0) 42.0 ppb (32) 0.32 ppb (4) 32.0 μg/m3 (29) 4.0 μg/m3 (17) 32.0
 
March 23, 2019, 1 a.m. 7.7 ppb (7) 0.2 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 59.0 ppb (45) 0.18 ppb (2) 19.0 μg/m3 (17) 0.0 μg/m3 (0) 45.0
 
March 23, 2019, midnight 3.6 ppb (3) -0.1 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 64.0 ppb (49) 0.13 ppb (1) 11.0 μg/m3 (10) 2.0 μg/m3 (8) 49.0
 
March 22, 2019, 11 p.m. 4.0 ppb (4) -0.1 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 63.0 ppb (48) 0.13 ppb (1) 11.0 μg/m3 (10) 3.0 μg/m3 (12) 48.0
 
March 22, 2019, 10 p.m. 2.8 ppb (3) -0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 63.0 ppb (48) 0.13 ppb (1) 12.0 μg/m3 (11) 1.0 μg/m3 (4) 48.0
 
March 22, 2019, 9 p.m. 2.8 ppb (3) -0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 62.0 ppb (48) 0.13 ppb (1) 7.0 μg/m3 (6) -1.0 μg/m3 (0) 48.0
 
March 22, 2019, 8 p.m. 2.5 ppb (2) -0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 59.0 ppb (45) 0.13 ppb (1) 9.0 μg/m3 (8) 2.0 μg/m3 (8) 45.0
 
March 22, 2019, 7 p.m. 2.0 ppb (2) -0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 58.0 ppb (45) 0.13 ppb (1) 10.0 μg/m3 (9) 2.0 μg/m3 (8) 45.0
 
March 22, 2019, 6 p.m. 1.9 ppb (2) -0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 54.0 ppb (42) 0.12 ppb (1) 11.0 μg/m3 (10) 2.0 μg/m3 (8) 42.0
 
March 22, 2019, 5 p.m. 1.6 ppb (1) -0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 51.0 ppb (39) 0.12 ppb (1) 7.0 μg/m3 (6) 1.0 μg/m3 (4) 39.0
 
March 22, 2019, 4 p.m. 2.5 ppb (2) -0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 48.0 ppb (37) 0.12 ppb (1) 16.0 μg/m3 (15) 0.0 μg/m3 (0) 37.0
 
March 22, 2019, 3 p.m. 5.0 ppb (5) 0.5 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 41.0 ppb (32) 0.14 ppb (2) 29.0 μg/m3 (26) 3.0 μg/m3 (12) 32.0
 
March 22, 2019, 2 p.m. 5.0 ppb (5) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 41.0 ppb (32) 0.16 ppb (2) 42.0 μg/m3 (38) 4.0 μg/m3 (17) 38.0
 
March 22, 2019, 1 p.m. 5.3 ppb (5) -0.1 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 38.0 ppb (29) 0.16 ppb (2) 20.0 μg/m3 (18) 1.0 μg/m3 (4) 29.0
 
March 22, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A 9.0 μg/m3 (8) 1.0 μg/m3 (4) 8.0
 
March 22, 2019, 11 a.m. 2.9 ppb (3) -0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 40.0 ppb (31) 0.13 ppb (1) 14.0 μg/m3 (13) 3.0 μg/m3 (12) 31.0
 
March 22, 2019, 10 a.m. 2.3 ppb (2) -0.5 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 42.0 ppb (32) 0.13 ppb (1) 8.0 μg/m3 (7) 4.0 μg/m3 (17) 32.0
 
March 22, 2019, 9 a.m. 2.5 ppb (2) -0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 44.0 ppb (34) 0.12 ppb (1) 5.0 μg/m3 (5) 4.0 μg/m3 (17) 34.0
 
March 22, 2019, 8 a.m. 2.5 ppb (2) -0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 44.0 ppb (34) 0.12 ppb (1) 6.0 μg/m3 (5) 2.0 μg/m3 (8) 34.0
 
March 22, 2019, 7 a.m. 2.2 ppb (2) -0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 45.0 ppb (35) 0.12 ppb (1) 9.0 μg/m3 (8) 3.0 μg/m3 (12) 35.0
 
March 22, 2019, 6 a.m. 1.5 ppb (1) -0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 46.0 ppb (35) 0.11 ppb (1) 7.0 μg/m3 (6) 2.0 μg/m3 (8) 35.0
 
March 22, 2019, 5 a.m. 1.5 ppb (1) -0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (38) 0.12 ppb (1) 5.0 μg/m3 (5) 2.0 μg/m3 (8) 38.0
 
March 22, 2019, 4 a.m. 1.7 ppb (2) -0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 50.0 ppb (38) 0.12 ppb (1) 16.0 μg/m3 (15) 0.0 μg/m3 (0) 38.0
 
March 22, 2019, 3 a.m. 2.0 ppb (2) -0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 48.0 ppb (37) 0.12 ppb (1) 12.0 μg/m3 (11) 1.0 μg/m3 (4) 37.0
 
March 22, 2019, 2 a.m. 2.4 ppb (2) -0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 45.0 ppb (35) 0.12 ppb (1) 15.0 μg/m3 (14) 3.0 μg/m3 (12) 35.0
 
March 22, 2019, 1 a.m. 2.8 ppb (3) -0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 47.0 ppb (36) 0.12 ppb (1) 22.0 μg/m3 (20) 1.0 μg/m3 (4) 36.0
 
March 22, 2019, midnight 2.6 ppb (2) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 51.0 ppb (39) 0.12 ppb (1) 22.0 μg/m3 (20) 2.0 μg/m3 (8) 39.0
 
March 21, 2019, 11 p.m. 2.7 ppb (3) -0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 52.0 ppb (40) 0.12 ppb (1) 30.0 μg/m3 (27) 5.0 μg/m3 (21) 40.0
 
March 21, 2019, 10 p.m. 3.0 ppb (3) -0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 55.0 ppb (42) 0.13 ppb (1) 21.0 μg/m3 (19) 4.0 μg/m3 (17) 42.0
 
March 21, 2019, 9 p.m. 8.9 ppb (8) 1.7 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 50.0 ppb (38) 0.17 ppb (2) 29.0 μg/m3 (26) 5.0 μg/m3 (21) 38.0
 
March 21, 2019, 8 p.m. 6.4 ppb (6) 0.5 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 50.0 ppb (38) 0.18 ppb (2) 25.0 μg/m3 (23) 5.0 μg/m3 (21) 38.0
 
March 21, 2019, 7 p.m. 2.6 ppb (2) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 52.0 ppb (40) 0.12 ppb (1) 10.0 μg/m3 (9) N/A 40.0
 
March 21, 2019, 6 p.m. 2.3 ppb (2) -0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 51.0 ppb (39) 0.12 ppb (1) 13.0 μg/m3 (12) N/A 39.0
 
March 21, 2019, 5 p.m. 2.3 ppb (2) -0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 50.0 ppb (38) 0.12 ppb (1) 22.0 μg/m3 (20) 3.0 μg/m3 (12) 38.0
 
March 21, 2019, 4 p.m. 2.4 ppb (2) -0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 49.0 ppb (38) 0.12 ppb (1) 30.0 μg/m3 (27) 3.0 μg/m3 (12) 38.0
 
March 21, 2019, 3 p.m. 3.2 ppb (3) -0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 47.0 ppb (36) 0.12 ppb (1) 21.0 μg/m3 (19) 3.0 μg/m3 (12) 36.0
 
March 21, 2019, 2 p.m. 4.5 ppb (4) -0.2 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 44.0 ppb (34) 0.15 ppb (2) 17.0 μg/m3 (15) 4.0 μg/m3 (17) 34.0
 
March 21, 2019, 1 p.m. 5.8 ppb (5) -0.2 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 42.0 ppb (32) 0.15 ppb (2) 23.0 μg/m3 (21) 5.0 μg/m3 (21) 32.0
 
March 21, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A 9.0 μg/m3 (8) 1.0 μg/m3 (4) 8.0
 
March 21, 2019, 11 a.m. 1.6 ppb (1) -0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (38) 0.11 ppb (1) 8.0 μg/m3 (7) 3.0 μg/m3 (12) 38.0
 
March 21, 2019, 10 a.m. 1.6 ppb (1) -0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 50.0 ppb (38) 0.11 ppb (1) 7.0 μg/m3 (6) 2.0 μg/m3 (8) 38.0
 
March 21, 2019, 9 a.m. 1.6 ppb (1) -0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 50.0 ppb (38) 0.11 ppb (1) 4.0 μg/m3 (4) 0.0 μg/m3 (0) 38.0
 
March 21, 2019, 8 a.m. 1.6 ppb (1) -0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 51.0 ppb (39) 0.12 ppb (1) 7.0 μg/m3 (6) 1.0 μg/m3 (4) 39.0
 
March 21, 2019, 7 a.m. 1.7 ppb (2) -0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (38) 0.12 ppb (1) 11.0 μg/m3 (10) 0.0 μg/m3 (0) 38.0
 
March 21, 2019, 6 a.m. 1.6 ppb (1) -0.6 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (38) 0.11 ppb (1) 10.0 μg/m3 (9) 0.0 μg/m3 (0) 38.0
 
March 21, 2019, 5 a.m. 2.3 ppb (2) -0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 48.0 ppb (37) 0.12 ppb (1) 13.0 μg/m3 (12) 0.0 μg/m3 (0) 37.0
 
March 21, 2019, 4 a.m. 2.3 ppb (2) -0.6 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 47.0 ppb (36) 0.12 ppb (1) 15.0 μg/m3 (14) 1.0 μg/m3 (4) 36.0
 
March 21, 2019, 3 a.m. 2.2 ppb (2) -0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 48.0 ppb (37) 0.12 ppb (1) 22.0 μg/m3 (20) 1.0 μg/m3 (4) 37.0
 
March 21, 2019, 2 a.m. 2.0 ppb (2) -0.5 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 48.0 ppb (37) 0.12 ppb (1) N/A 7.0 μg/m3 (29) 37.0
 
March 21, 2019, 1 a.m. 2.0 ppb (2) -0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (38) 0.11 ppb (1) 311.0 μg/m3 (178) 14.0 μg/m3 (54) 178.0
 
March 21, 2019, midnight 2.6 ppb (2) -0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 51.0 ppb (39) 0.11 ppb (1) 121.0 μg/m3 (83) 7.0 μg/m3 (29) 83.0
 
March 20, 2019, 11 p.m. 2.5 ppb (2) -0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 53.0 ppb (41) 0.11 ppb (1) 22.0 μg/m3 (20) 6.0 μg/m3 (25) 41.0
 
March 20, 2019, 10 p.m. 2.0 ppb (2) -0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 51.0 ppb (39) 0.11 ppb (1) 15.0 μg/m3 (14) 3.0 μg/m3 (12) 39.0
 
March 20, 2019, 9 p.m. 2.0 ppb (2) -0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (38) 0.11 ppb (1) 26.0 μg/m3 (24) 3.0 μg/m3 (12) 38.0
 
March 20, 2019, 8 p.m. 3.2 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 47.0 ppb (36) 0.12 ppb (1) 38.0 μg/m3 (35) 4.0 μg/m3 (17) 36.0
 
March 20, 2019, 7 p.m. 6.7 ppb (6) 0.6 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 46.0 ppb (35) 0.15 ppb (2) 49.0 μg/m3 (45) 8.0 μg/m3 (33) 45.0
 
March 20, 2019, 6 p.m. 39.9 ppb (37) 10.1 ppb (9) N/A 30.0 ppb (28) N/A 1.0 ppb (1) 28.0 ppb (22) 0.5 ppb (6) 78.0 μg/m3 (62) 15.0 μg/m3 (56) 62.0
 
March 20, 2019, 5 p.m. 68.5 ppb (65) 24.5 ppb (23) N/A 44.0 ppb (41) N/A 1.0 ppb (1) 10.0 ppb (8) 0.94 ppb (10) 158.0 μg/m3 (102) 26.0 μg/m3 (80) 102.0
 
March 20, 2019, 4 p.m. 42.8 ppb (40) 15.9 ppb (15) N/A 27.0 ppb (25) N/A 1.0 ppb (1) 15.0 ppb (12) 0.77 ppb (9) 197.0 μg/m3 (121) 29.0 μg/m3 (86) 121.0
 
March 20, 2019, 3 p.m. 10.7 ppb (10) 0.4 ppb (0) N/A 10.0 ppb (9) N/A 0.0 ppb (0) 38.0 ppb (29) 0.21 ppb (2) 62.0 μg/m3 (54) 4.0 μg/m3 (17) 54.0
 
March 20, 2019, 2 p.m. 5.7 ppb (5) -0.3 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 46.0 ppb (35) 0.15 ppb (2) 93.0 μg/m3 (69) 6.0 μg/m3 (25) 69.0
 
March 20, 2019, 1 p.m. 4.9 ppb (5) -0.4 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 47.0 ppb (36) 0.12 ppb (1) 36.0 μg/m3 (33) 6.0 μg/m3 (25) 36.0
 
March 20, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A 48.0 μg/m3 (44) 9.0 μg/m3 (38) 44.0
 
March 20, 2019, 11 a.m. 11.4 ppb (11) 0.0 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 18.0 ppb (14) 0.2 ppb (2) 44.0 μg/m3 (40) 9.0 μg/m3 (38) 40.0
 
March 20, 2019, 10 a.m. 7.3 ppb (7) -0.2 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 26.0 ppb (20) 0.17 ppb (2) 40.0 μg/m3 (36) 6.0 μg/m3 (25) 36.0
 
March 20, 2019, 9 a.m. 3.9 ppb (4) -0.3 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (29) 0.11 ppb (1) 16.0 μg/m3 (15) 3.0 μg/m3 (12) 29.0
 
March 20, 2019, 8 a.m. 2.7 ppb (3) -0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 39.0 ppb (30) 0.1 ppb (1) 17.0 μg/m3 (15) 5.0 μg/m3 (21) 30.0
 
March 20, 2019, 7 a.m. 4.8 ppb (4) -0.3 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 31.0 ppb (24) 0.12 ppb (1) 14.0 μg/m3 (13) 5.0 μg/m3 (21) 24.0
 
March 20, 2019, 6 a.m. 10.1 ppb (9) -0.3 ppb (0) N/A 10.0 ppb (9) N/A 1.0 ppb (1) 29.0 ppb (22) 0.16 ppb (2) 22.0 μg/m3 (20) 6.0 μg/m3 (25) 25.0
 
March 20, 2019, 5 a.m. 11.0 ppb (10) 0.2 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 32.0 ppb (25) 0.18 ppb (2) 33.0 μg/m3 (30) 7.0 μg/m3 (29) 30.0
 
March 20, 2019, 4 a.m. 21.0 ppb (19) 1.3 ppb (1) N/A 20.0 ppb (19) N/A 1.0 ppb (1) 27.0 ppb (21) 0.23 ppb (3) 42.0 μg/m3 (38) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 3 a.m. 20.7 ppb (19) 1.7 ppb (2) N/A 19.0 ppb (18) N/A 1.0 ppb (1) 29.0 ppb (22) 0.21 ppb (2) 43.0 μg/m3 (39) 8.0 μg/m3 (33) 39.0
 
March 20, 2019, 2 a.m. 16.8 ppb (16) 1.6 ppb (1) N/A 15.0 ppb (14) N/A 1.0 ppb (1) 33.0 ppb (25) 0.18 ppb (2) 42.0 μg/m3 (38) 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 1 a.m. 10.2 ppb (9) 1.2 ppb (1) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 42.0 ppb (32) 0.16 ppb (2) 34.0 μg/m3 (31) 3.0 μg/m3 (12) 32.0
 
March 20, 2019, midnight 7.3 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 48.0 ppb (37) 0.14 ppb (2) 33.0 μg/m3 (30) 2.0 μg/m3 (8) 37.0
 
March 19, 2019, 11 p.m. 6.1 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 49.0 ppb (38) 0.14 ppb (2) 35.0 μg/m3 (32) 3.0 μg/m3 (12) 38.0
 
March 19, 2019, 10 p.m. 6.4 ppb (6) 1.1 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 50.0 ppb (38) 0.12 ppb (1) 45.0 μg/m3 (41) 3.0 μg/m3 (12) 41.0
 
March 19, 2019, 9 p.m. 5.7 ppb (5) 0.9 ppb (1) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 51.0 ppb (39) 0.12 ppb (1) 41.0 μg/m3 (37) 3.0 μg/m3 (12) 39.0
 
March 19, 2019, 8 p.m. 6.4 ppb (6) 0.6 ppb (1) N/A 6.0 ppb (6) N/A 3.0 ppb (4) 51.0 ppb (39) 0.13 ppb (1) 44.0 μg/m3 (40) 4.0 μg/m3 (17) 40.0
 
March 19, 2019, 7 p.m. 17.8 ppb (16) 3.2 ppb (3) N/A 14.0 ppb (13) N/A 3.0 ppb (4) 55.0 ppb (42) 0.26 ppb (3) N/A N/A 42.0
 
March 19, 2019, 6 p.m. 18.2 ppb (17) 2.2 ppb (2) N/A 16.0 ppb (15) N/A 2.0 ppb (3) 55.0 ppb (42) 0.38 ppb (4) N/A N/A 42.0
 
March 19, 2019, 5 p.m. 9.7 ppb (9) 1.3 ppb (1) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 44.0 ppb (34) 0.19 ppb (2) N/A N/A 34.0
 
March 19, 2019, 4 p.m. 14.4 ppb (13) 2.9 ppb (3) N/A 12.0 ppb (11) N/A 1.0 ppb (1) 35.0 ppb (27) 0.24 ppb (3) N/A N/A 27.0
 
March 19, 2019, 3 p.m. 47.3 ppb (44) 25.2 ppb (23) N/A 22.0 ppb (20) N/A 1.0 ppb (1) 17.0 ppb (13) 0.62 ppb (7) N/A N/A 44.0
 
March 19, 2019, 2 p.m. 44.6 ppb (41) 26.8 ppb (25) N/A 18.0 ppb (17) N/A 1.0 ppb (1) 4.0 ppb (3) 0.71 ppb (8) N/A N/A 41.0
 
March 19, 2019, 1 p.m. 42.4 ppb (39) 15.2 ppb (14) N/A 27.0 ppb (25) N/A 1.0 ppb (1) 3.0 ppb (2) 0.62 ppb (7) N/A N/A 39.0
 
March 19, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
March 19, 2019, 11 a.m. 38.3 ppb (35) 6.9 ppb (6) N/A 31.0 ppb (29) N/A 1.0 ppb (1) 2.0 ppb (2) 0.64 ppb (7) N/A N/A 35.0
 
March 19, 2019, 10 a.m. 21.4 ppb (20) 1.3 ppb (1) N/A 20.0 ppb (19) N/A 0.0 ppb (0) 10.0 ppb (8) 0.36 ppb (4) N/A N/A 20.0
 
March 19, 2019, 9 a.m. 9.8 ppb (9) -0.2 ppb (0) N/A 10.0 ppb (9) N/A 0.0 ppb (0) 21.0 ppb (16) 0.17 ppb (2) N/A N/A 16.0
 
March 19, 2019, 8 a.m. 13.2 ppb (12) 0.3 ppb (0) N/A 13.0 ppb (12) N/A 0.0 ppb (0) 21.0 ppb (16) 0.27 ppb (3) N/A N/A 16.0
 
March 19, 2019, 7 a.m. 11.9 ppb (11) -0.1 ppb (0) N/A 12.0 ppb (11) N/A 1.0 ppb (1) 28.0 ppb (22) 0.2 ppb (2) N/A N/A 22.0
 
March 19, 2019, 6 a.m. 24.9 ppb (23) 1.0 ppb (1) N/A 24.0 ppb (22) N/A 1.0 ppb (1) 17.0 ppb (13) 0.37 ppb (4) N/A N/A 23.0
 
March 19, 2019, 5 a.m. 33.8 ppb (31) 1.1 ppb (1) N/A 33.0 ppb (31) N/A 1.0 ppb (1) 12.0 ppb (9) 0.51 ppb (6) N/A N/A 31.0
 
March 19, 2019, 4 a.m. 39.8 ppb (37) 2.2 ppb (2) N/A 38.0 ppb (35) N/A 1.0 ppb (1) 10.0 ppb (8) 0.57 ppb (6) N/A N/A 37.0
 
March 19, 2019, 3 a.m. 29.5 ppb (27) 2.6 ppb (2) N/A 27.0 ppb (25) N/A 0.0 ppb (0) 21.0 ppb (16) 0.45 ppb (5) N/A N/A 27.0
 
March 19, 2019, 2 a.m. 17.6 ppb (16) 1.8 ppb (2) N/A 16.0 ppb (15) N/A 0.0 ppb (0) 31.0 ppb (24) 0.34 ppb (4) N/A N/A 24.0
 
March 19, 2019, 1 a.m. 9.2 ppb (9) 1.1 ppb (1) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 48.0 ppb (37) 0.18 ppb (2) N/A N/A 37.0
 
March 19, 2019, midnight 5.0 ppb (5) 0.7 ppb (1) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 54.0 ppb (42) 0.14 ppb (2) N/A N/A 42.0
 
March 18, 2019, 11 p.m. 5.5 ppb (5) 0.7 ppb (1) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 53.0 ppb (41) 0.12 ppb (1) N/A N/A 41.0
 
March 18, 2019, 10 p.m. 7.2 ppb (7) 0.9 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 55.0 ppb (42) 0.13 ppb (1) N/A N/A 42.0
 
March 18, 2019, 9 p.m. 3.9 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 58.0 ppb (45) 0.11 ppb (1) N/A N/A 45.0
 
March 18, 2019, 8 p.m. 5.5 ppb (5) 0.7 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 59.0 ppb (45) 0.14 ppb (2) N/A N/A 45.0
 
March 18, 2019, 7 p.m. 6.2 ppb (6) 0.3 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 60.0 ppb (46) 0.17 ppb (2) N/A N/A 46.0
 
March 18, 2019, 6 p.m. 5.9 ppb (5) 0.5 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 50.0 ppb (38) 0.14 ppb (2) N/A N/A 38.0
 
March 18, 2019, 5 p.m. 7.2 ppb (7) 0.8 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 43.0 ppb (33) 0.14 ppb (2) N/A N/A 33.0
 
March 18, 2019, 4 p.m. 8.5 ppb (8) 1.6 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 35.0 ppb (27) 0.15 ppb (2) N/A N/A 27.0
 
March 18, 2019, 3 p.m. 17.6 ppb (16) 4.3 ppb (4) N/A 13.0 ppb (12) N/A 0.0 ppb (0) 25.0 ppb (19) 0.19 ppb (2) N/A N/A 19.0
 
March 18, 2019, 2 p.m. 24.1 ppb (22) 4.1 ppb (4) N/A 20.0 ppb (19) N/A 0.0 ppb (0) 16.0 ppb (12) 0.32 ppb (4) N/A N/A 22.0
 
March 18, 2019, 1 p.m. 33.4 ppb (31) 10.2 ppb (9) N/A 23.0 ppb (21) N/A 0.0 ppb (0) 9.0 ppb (7) 0.33 ppb (4) N/A N/A 31.0
 
March 18, 2019, noon N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
March 18, 2019, 11 a.m. 13.3 ppb (12) 0.0 ppb (0) N/A 13.0 ppb (12) N/A 0.0 ppb (0) 20.0 ppb (15) 0.16 ppb (2) N/A N/A 15.0
 
March 18, 2019, 10 a.m. 12.3 ppb (11) 0.0 ppb (0) N/A 12.0 ppb (11) N/A 0.0 ppb (0) 20.0 ppb (15) 0.18 ppb (2) N/A N/A 15.0
 
March 18, 2019, 9 a.m. 8.8 ppb (8) -0.2 ppb (0) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 24.0 ppb (18) 0.16 ppb (2) N/A N/A 18.0
 
March 18, 2019, 8 a.m. 12.0 ppb (11) 0.0 ppb (0) N/A 12.0 ppb (11) N/A 0.0 ppb (0) 24.0 ppb (18) 0.17 ppb (2) N/A N/A 18.0