ID: 318

AQSQID: 130890002

Site Name: South Dekalb

Added: April 21, 2020, 6:24 p.m.

Updated: April 21, 2021, 8:44 p.m.

Location: Decatur (Clifton Spgs Rd), GA

Reporting: True, Located: True

Current AQI: 37.0

Decatur (Clifton Spgs Rd) GA, US: 33.6906, -84.2731

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
April 21, 2021, 7 p.m. 3.4 ppb (4) 0.6 ppb (1) 3.0 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 39.0 ppb (37) 0.19 ppb (3) N/A N/A 37.0
 
April 21, 2021, 6 p.m. 3.6 ppb (4) 0.7 ppb (1) 4.0 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 39.0 ppb (37) N/A 15.4 μg/m3 (15) 3.9 μg/m3 (17) 37.0
 
April 21, 2021, 5 p.m. 4.0 ppb (4) 0.8 ppb (1) 4.0 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 38.0 ppb (36) N/A 18.0 μg/m3 (17) 4.8 μg/m3 (20) 36.0
 
April 21, 2021, 4 p.m. 3.6 ppb (4) 0.7 ppb (1) 4.0 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 37.0 ppb (35) N/A 17.8 μg/m3 (17) 6.7 μg/m3 (28) 35.0
 
April 21, 2021, 3 p.m. 4.5 ppb (5) 1.0 ppb (1) 5.0 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 34.0 ppb (32) N/A 23.7 μg/m3 (22) 7.3 μg/m3 (31) 32.0
 
April 21, 2021, 2 p.m. 6.3 ppb (6) 1.5 ppb (2) 7.0 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 29.0 ppb (27) 0.18 ppb (3) 24.5 μg/m3 (23) 8.4 μg/m3 (36) 36.0
 
April 21, 2021, 1 p.m. 7.2 ppb (7) 1.5 ppb (2) 8.0 ppb (8) 6.0 ppb (6) N/A 0.0 ppb (0) 25.0 ppb (24) 0.19 ppb (3) 26.7 μg/m3 (25) 11.6 μg/m3 (49) 49.0
 
April 21, 2021, noon 7.6 ppb (8) 0.9 ppb (1) 8.0 ppb (8) 7.0 ppb (7) N/A 0.0 ppb (0) 24.0 ppb (23) 0.21 ppb (3) 29.8 μg/m3 (28) 14.5 μg/m3 (57) 57.0
 
April 21, 2021, 11 a.m. 16.4 ppb (16) 2.9 ppb (3) 15.0 ppb (15) 14.0 ppb (14) N/A 0.0 ppb (0) 16.0 ppb (15) 0.28 ppb (4) 26.4 μg/m3 (25) 18.2 μg/m3 (64) 64.0
 
April 21, 2021, 10 a.m. 38.5 ppb (37) 17.2 ppb (17) 32.0 ppb (31) 21.0 ppb (20) N/A 0.0 ppb (0) 0.0 ppb (0) 0.36 ppb (5) 26.7 μg/m3 (25) 18.5 μg/m3 (65) 65.0
 
April 21, 2021, 9 a.m. 49.7 ppb (47) 31.8 ppb (30) 48.0 ppb (46) 18.0 ppb (17) N/A 0.0 ppb (0) 0.0 ppb (0) N/A 27.0 μg/m3 (25) 19.8 μg/m3 (68) 68.0
 
April 21, 2021, 8 a.m. 39.1 ppb (37) 20.7 ppb (20) 45.0 ppb (43) 18.0 ppb (17) N/A 0.0 ppb (0) 0.0 ppb (0) N/A 28.6 μg/m3 (27) 21.6 μg/m3 (71) 71.0
 
April 21, 2021, 7 a.m. 28.4 ppb (27) 6.6 ppb (7) 27.0 ppb (26) 22.0 ppb (21) N/A -1.0 ppb (0) 1.0 ppb (1) 0.39 ppb (5) 29.8 μg/m3 (28) 22.3 μg/m3 (73) 73.0
 
April 21, 2021, 6 a.m. 62.1 ppb (60) 36.9 ppb (35) 65.0 ppb (63) 25.0 ppb (24) N/A 0.0 ppb (0) 0.0 ppb (0) 0.57 ppb (7) 31.8 μg/m3 (30) 24.7 μg/m3 (78) 78.0
 
April 21, 2021, 5 a.m. 81.1 ppb (80) 52.8 ppb (50) 90.0 ppb (90) 28.0 ppb (27) N/A 0.0 ppb (0) 0.0 ppb (0) 0.63 ppb (7) 32.0 μg/m3 (30) 23.8 μg/m3 (76) 90.0
 
April 21, 2021, 4 a.m. 92.0 ppb (92) 63.9 ppb (62) 104.0 ppb (102) 28.0 ppb (27) N/A 0.0 ppb (0) 0.0 ppb (0) 0.72 ppb (8) N/A N/A 102.0
 
April 21, 2021, 3 a.m. 88.5 ppb (88) 56.0 ppb (54) 104.0 ppb (102) 33.0 ppb (32) N/A 0.0 ppb (0) 0.0 ppb (0) 0.77 ppb (10) 34.0 μg/m3 (32) 23.6 μg/m3 (76) 102.0
 
April 21, 2021, 2 a.m. 34.5 ppb (33) 7.6 ppb (8) 46.0 ppb (44) 27.0 ppb (26) N/A 0.0 ppb (0) 7.0 ppb (7) 0.45 ppb (6) 31.5 μg/m3 (30) 25.1 μg/m3 (79) 79.0
 
April 21, 2021, 1 a.m. 11.1 ppb (11) -0.1 ppb (0) 14.0 ppb (14) 11.0 ppb (11) N/A 0.0 ppb (0) 28.0 ppb (26) 0.29 ppb (4) 29.1 μg/m3 (27) 20.9 μg/m3 (70) 70.0
 
April 21, 2021, midnight 3.3 ppb (4) -0.1 ppb (0) 4.0 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 45.0 ppb (42) 0.21 ppb (3) 25.9 μg/m3 (24) 18.3 μg/m3 (65) 65.0
 
April 20, 2021, 11 p.m. 2.5 ppb (3) -0.1 ppb (0) 2.0 ppb (2) 3.0 ppb (3) N/A 0.0 ppb (0) 51.0 ppb (48) 0.2 ppb (3) 27.5 μg/m3 (26) 18.7 μg/m3 (65) 65.0
 
April 20, 2021, 10 p.m. 2.0 ppb (2) -0.1 ppb (0) 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 55.0 ppb (51) 0.19 ppb (3) 30.4 μg/m3 (29) 21.7 μg/m3 (72) 72.0
 
April 20, 2021, 9 p.m. 2.2 ppb (3) 0.0 ppb (0) 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 58.0 ppb (61) 0.19 ppb (3) 31.7 μg/m3 (30) 22.1 μg/m3 (73) 73.0
 
April 20, 2021, 8 p.m. 2.5 ppb (3) 0.0 ppb (0) 2.0 ppb (2) 3.0 ppb (3) N/A 0.0 ppb (0) 59.0 ppb (65) 0.17 ppb (3) 22.7 μg/m3 (22) 13.9 μg/m3 (55) 65.0
 
April 20, 2021, 7 p.m. 2.4 ppb (3) 0.0 ppb (0) 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 57.0 ppb (58) 0.16 ppb (3) 19.9 μg/m3 (19) 11.5 μg/m3 (48) 58.0
 
April 20, 2021, 6 p.m. 2.6 ppb (3) 0.1 ppb (1) 2.0 ppb (2) 3.0 ppb (3) N/A 0.0 ppb (0) 56.0 ppb (55) 0.17 ppb (3) 20.7 μg/m3 (20) 11.6 μg/m3 (49) 55.0
 
April 20, 2021, 5 p.m. 2.9 ppb (3) 0.2 ppb (1) 3.0 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 53.0 ppb (50) 0.18 ppb (3) 22.1 μg/m3 (21) 11.5 μg/m3 (48) 50.0
 
April 20, 2021, 4 p.m. 5.3 ppb (5) 0.8 ppb (1) 5.0 ppb (5) 5.0 ppb (5) N/A 0.0 ppb (0) 42.0 ppb (39) 0.22 ppb (3) 18.4 μg/m3 (18) 9.7 μg/m3 (41) 41.0
 
April 20, 2021, 3 p.m. 9.0 ppb (9) 1.9 ppb (2) 10.0 ppb (10) 7.0 ppb (7) N/A 0.0 ppb (0) 33.0 ppb (31) 0.25 ppb (3) 16.3 μg/m3 (16) 8.5 μg/m3 (36) 36.0
 
April 20, 2021, 2 p.m. 60.5 ppb (58) 40.1 ppb (38) 63.0 ppb (61) 20.0 ppb (19) N/A 0.0 ppb (0) 4.0 ppb (4) 0.61 ppb (7) 25.1 μg/m3 (24) 13.4 μg/m3 (54) 61.0
 
April 20, 2021, 1 p.m. 75.6 ppb (75) 60.6 ppb (59) 80.0 ppb (79) 15.0 ppb (15) N/A 0.0 ppb (0) 1.0 ppb (1) 0.66 ppb (8) 23.8 μg/m3 (23) 15.0 μg/m3 (58) 79.0
 
April 20, 2021, noon 65.7 ppb (64) 55.6 ppb (53) 77.0 ppb (76) 10.0 ppb (10) N/A 0.0 ppb (0) 0.0 ppb (0) 0.61 ppb (7) 21.8 μg/m3 (21) 15.1 μg/m3 (58) 76.0
 
April 20, 2021, 11 a.m. 62.4 ppb (60) 49.8 ppb (47) 69.0 ppb (67) 12.0 ppb (12) N/A 0.0 ppb (0) 0.0 ppb (0) 0.58 ppb (7) 20.3 μg/m3 (19) 15.3 μg/m3 (58) 67.0
 
April 20, 2021, 10 a.m. 59.3 ppb (57) 47.3 ppb (45) 63.0 ppb (61) 12.0 ppb (12) N/A 0.0 ppb (0) 0.0 ppb (0) 0.55 ppb (7) 20.7 μg/m3 (20) 15.3 μg/m3 (58) 61.0
 
April 20, 2021, 9 a.m. 48.3 ppb (46) 34.2 ppb (33) 52.0 ppb (50) 14.0 ppb (14) N/A 0.0 ppb (0) 0.0 ppb (0) 0.51 ppb (6) 21.8 μg/m3 (21) 15.7 μg/m3 (59) 59.0
 
April 20, 2021, 8 a.m. 35.3 ppb (34) 19.6 ppb (19) 38.0 ppb (36) 16.0 ppb (16) N/A 0.0 ppb (0) 0.0 ppb (0) 0.47 ppb (6) 23.0 μg/m3 (22) 15.5 μg/m3 (59) 59.0
 
April 20, 2021, 7 a.m. 35.1 ppb (34) 15.9 ppb (15) 37.0 ppb (35) 19.0 ppb (18) N/A 0.0 ppb (0) 0.0 ppb (0) 0.46 ppb (6) 23.3 μg/m3 (22) 15.6 μg/m3 (59) 59.0
 
April 20, 2021, 6 a.m. 37.2 ppb (36) 15.4 ppb (15) 39.0 ppb (37) 22.0 ppb (21) N/A 0.0 ppb (0) 0.0 ppb (0) 0.47 ppb (6) 23.1 μg/m3 (22) 14.7 μg/m3 (57) 57.0
 
April 20, 2021, 5 a.m. 56.6 ppb (54) 32.3 ppb (31) 61.0 ppb (59) 24.0 ppb (23) N/A 0.0 ppb (0) 0.0 ppb (0) 0.53 ppb (6) 21.4 μg/m3 (20) 13.7 μg/m3 (55) 59.0
 
April 20, 2021, 4 a.m. 52.6 ppb (50) 23.1 ppb (22) 59.0 ppb (57) 30.0 ppb (29) N/A 0.0 ppb (0) 0.0 ppb (0) 0.51 ppb (6) N/A N/A 57.0
 
April 20, 2021, 3 a.m. 40.2 ppb (38) 9.8 ppb (10) 47.0 ppb (45) 30.0 ppb (29) N/A 0.0 ppb (0) 0.0 ppb (0) 0.45 ppb (6) 18.5 μg/m3 (18) 11.9 μg/m3 (50) 50.0
 
April 20, 2021, 2 a.m. 31.5 ppb (30) 1.1 ppb (2) 37.0 ppb (35) 31.0 ppb (30) N/A N/A 4.0 ppb (4) 0.4 ppb (5) 15.5 μg/m3 (15) 10.2 μg/m3 (43) 43.0
 
April 20, 2021, 1 a.m. 25.2 ppb (24) 0.1 ppb (1) 30.0 ppb (29) 25.0 ppb (24) N/A N/A 16.0 ppb (15) 0.35 ppb (4) 16.3 μg/m3 (16) 10.3 μg/m3 (43) 43.0
 
April 20, 2021, midnight 13.9 ppb (14) -0.1 ppb (0) 15.0 ppb (15) 14.0 ppb (14) N/A N/A 34.0 ppb (32) 0.26 ppb (4) 14.8 μg/m3 (14) 9.4 μg/m3 (40) 40.0
 
April 19, 2021, 11 p.m. 6.7 ppb (7) 0.0 ppb (0) 8.0 ppb (8) 7.0 ppb (7) N/A 0.0 ppb (0) 43.0 ppb (40) 0.2 ppb (3) 15.5 μg/m3 (15) 9.3 μg/m3 (39) 40.0
 
April 19, 2021, 10 p.m. 4.6 ppb (5) 0.2 ppb (1) 5.0 ppb (5) 5.0 ppb (5) N/A 0.0 ppb (0) 50.0 ppb (47) 0.19 ppb (3) 17.2 μg/m3 (16) 9.6 μg/m3 (40) 47.0
 
April 19, 2021, 9 p.m. 3.8 ppb (4) 0.2 ppb (1) 4.0 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 54.0 ppb (50) 0.17 ppb (3) 15.8 μg/m3 (15) 9.3 μg/m3 (39) 50.0
 
April 19, 2021, 8 p.m. 4.2 ppb (4) 0.4 ppb (1) 4.0 ppb (4) 4.0 ppb (4) N/A -1.0 ppb (0) 52.0 ppb (49) 0.17 ppb (3) 16.1 μg/m3 (15) 8.2 μg/m3 (35) 49.0
 
April 19, 2021, 7 p.m. 3.6 ppb (4) 0.3 ppb (1) 4.0 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 50.0 ppb (47) 0.17 ppb (3) 16.4 μg/m3 (16) 8.4 μg/m3 (36) 47.0
 
April 19, 2021, 6 p.m. 3.6 ppb (4) 0.3 ppb (1) 4.0 ppb (4) 3.0 ppb (3) N/A -1.0 ppb (0) 49.0 ppb (46) 0.17 ppb (3) 17.4 μg/m3 (17) 8.5 μg/m3 (36) 46.0
 
April 19, 2021, 5 p.m. 3.8 ppb (4) 0.5 ppb (1) 4.0 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 46.0 ppb (43) 0.17 ppb (3) 16.8 μg/m3 (16) 8.8 μg/m3 (37) 43.0
 
April 19, 2021, 4 p.m. 4.2 ppb (4) 0.6 ppb (1) 4.0 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 42.0 ppb (39) 0.17 ppb (3) 15.7 μg/m3 (15) 8.3 μg/m3 (35) 39.0
 
April 19, 2021, 3 p.m. 5.3 ppb (5) 1.0 ppb (1) 5.0 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (36) 0.17 ppb (3) 17.3 μg/m3 (17) 8.2 μg/m3 (35) 36.0
 
April 19, 2021, 2 p.m. 5.9 ppb (6) 1.2 ppb (2) 6.0 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 34.0 ppb (32) 0.18 ppb (3) 16.2 μg/m3 (15) 8.5 μg/m3 (36) 36.0
 
April 19, 2021, 1 p.m. 9.1 ppb (9) 1.9 ppb (2) 10.0 ppb (10) 7.0 ppb (7) N/A 0.0 ppb (0) 28.0 ppb (26) 0.2 ppb (3) 16.5 μg/m3 (16) 9.2 μg/m3 (39) 39.0
 
April 19, 2021, noon 9.7 ppb (10) 1.3 ppb (2) 10.0 ppb (10) 9.0 ppb (9) N/A 0.0 ppb (0) 21.0 ppb (20) 0.2 ppb (3) 15.3 μg/m3 (15) 9.4 μg/m3 (40) 40.0
 
April 19, 2021, 11 a.m. 9.0 ppb (9) 0.2 ppb (1) 10.0 ppb (10) 9.0 ppb (9) N/A 0.0 ppb (0) 20.0 ppb (19) 0.2 ppb (3) 14.0 μg/m3 (13) 9.7 μg/m3 (41) 41.0
 
April 19, 2021, 10 a.m. 5.6 ppb (6) -0.2 ppb (0) 6.0 ppb (6) 6.0 ppb (6) N/A 0.0 ppb (0) 25.0 ppb (24) 0.18 ppb (3) 13.9 μg/m3 (13) 9.8 μg/m3 (41) 41.0
 
April 19, 2021, 9 a.m. 4.0 ppb (4) -0.2 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.17 ppb (3) 14.7 μg/m3 (14) 10.2 μg/m3 (43) 43.0
 
April 19, 2021, 8 a.m. 4.4 ppb (5) -0.2 ppb (0) 5.0 ppb (5) 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.17 ppb (3) 15.3 μg/m3 (15) 11.1 μg/m3 (47) 47.0
 
April 19, 2021, 7 a.m. 3.4 ppb (4) -0.2 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 31.0 ppb (29) 0.17 ppb (3) 14.8 μg/m3 (14) 10.8 μg/m3 (46) 46.0
 
April 19, 2021, 6 a.m. 2.9 ppb (3) -0.2 ppb (0) 3.0 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 33.0 ppb (31) 0.17 ppb (3) 15.0 μg/m3 (14) 10.6 μg/m3 (45) 45.0
 
April 19, 2021, 5 a.m. 2.4 ppb (3) -0.2 ppb (0) 3.0 ppb (3) 3.0 ppb (3) N/A -1.0 ppb (0) 35.0 ppb (33) 0.17 ppb (3) 14.7 μg/m3 (14) 10.0 μg/m3 (42) 42.0
 
April 19, 2021, 4 a.m. 2.9 ppb (3) -0.2 ppb (0) 3.0 ppb (3) 3.0 ppb (3) N/A -1.0 ppb (0) 35.0 ppb (33) 0.18 ppb (3) N/A N/A 33.0
 
April 19, 2021, 3 a.m. 4.8 ppb (5) -0.1 ppb (0) 5.0 ppb (5) 5.0 ppb (5) N/A N/A 32.0 ppb (30) 0.21 ppb (3) 15.6 μg/m3 (15) 9.8 μg/m3 (41) 41.0
 
April 19, 2021, 2 a.m. 8.1 ppb (8) -0.1 ppb (0) 7.0 ppb (7) 8.0 ppb (8) N/A -1.0 ppb (0) 26.0 ppb (25) 0.25 ppb (3) 15.0 μg/m3 (14) 9.7 μg/m3 (41) 41.0
 
April 19, 2021, 1 a.m. 9.6 ppb (10) -0.1 ppb (0) 12.0 ppb (12) 10.0 ppb (10) N/A 0.0 ppb (0) 26.0 ppb (25) 0.27 ppb (4) 14.2 μg/m3 (14) 10.0 μg/m3 (42) 42.0
 
April 19, 2021, midnight 4.8 ppb (5) -0.1 ppb (0) 6.0 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 39.0 ppb (37) 0.21 ppb (3) 14.4 μg/m3 (14) 9.2 μg/m3 (39) 39.0
 
April 18, 2021, 11 p.m. 3.2 ppb (4) -0.1 ppb (0) 3.0 ppb (3) 3.0 ppb (3) N/A -1.0 ppb (0) 43.0 ppb (40) 0.19 ppb (3) 14.6 μg/m3 (14) 8.0 μg/m3 (34) 40.0
 
April 18, 2021, 10 p.m. 2.7 ppb (3) 0.0 ppb (0) 3.0 ppb (3) 3.0 ppb (3) N/A N/A 47.0 ppb (44) 0.18 ppb (3) 12.8 μg/m3 (12) 7.6 μg/m3 (32) 44.0
 
April 18, 2021, 9 p.m. 2.4 ppb (3) 0.1 ppb (1) 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (46) 0.17 ppb (3) 14.1 μg/m3 (14) 7.4 μg/m3 (31) 46.0
 
April 18, 2021, 8 p.m. 2.1 ppb (2) 0.0 ppb (0) 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 51.0 ppb (48) 0.16 ppb (3) 13.7 μg/m3 (13) 7.3 μg/m3 (31) 48.0
 
April 18, 2021, 7 p.m. 2.2 ppb (3) 0.1 ppb (1) 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 51.0 ppb (48) 0.17 ppb (3) 13.6 μg/m3 (13) 7.6 μg/m3 (32) 48.0
 
April 18, 2021, 6 p.m. 2.1 ppb (2) 0.0 ppb (0) 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 52.0 ppb (49) 0.17 ppb (3) 13.1 μg/m3 (13) 7.8 μg/m3 (33) 49.0
 
April 18, 2021, 5 p.m. 2.6 ppb (3) 0.1 ppb (1) 2.0 ppb (2) 3.0 ppb (3) N/A 0.0 ppb (0) 50.0 ppb (47) 0.17 ppb (3) 12.4 μg/m3 (12) 7.3 μg/m3 (31) 47.0
 
April 18, 2021, 4 p.m. 3.0 ppb (3) 0.3 ppb (1) 3.0 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 46.0 ppb (43) 0.17 ppb (3) 11.5 μg/m3 (11) 6.7 μg/m3 (28) 43.0
 
April 18, 2021, 3 p.m. 2.1 ppb (2) 0.1 ppb (1) 2.0 ppb (2) 2.0 ppb (2) N/A -1.0 ppb (0) 44.0 ppb (41) 0.17 ppb (3) 11.4 μg/m3 (11) 6.6 μg/m3 (28) 41.0
 
April 18, 2021, 2 p.m. 3.8 ppb (4) 0.6 ppb (1) 4.0 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 37.0 ppb (35) 0.19 ppb (3) 12.7 μg/m3 (12) 8.1 μg/m3 (34) 35.0
 
April 18, 2021, 1 p.m. 4.5 ppb (5) 0.6 ppb (1) 5.0 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 32.0 ppb (30) 0.19 ppb (3) 13.0 μg/m3 (13) 8.0 μg/m3 (34) 34.0
 
April 18, 2021, noon 4.6 ppb (5) 0.3 ppb (1) 5.0 ppb (5) 4.0 ppb (4) N/A -1.0 ppb (0) 26.0 ppb (25) 0.2 ppb (3) 13.2 μg/m3 (13) 8.2 μg/m3 (35) 35.0
 
April 18, 2021, 11 a.m. 4.3 ppb (5) 0.0 ppb (0) 5.0 ppb (5) 4.0 ppb (4) N/A -1.0 ppb (0) 19.0 ppb (18) 0.2 ppb (3) 12.7 μg/m3 (12) 7.9 μg/m3 (33) 33.0
 
April 18, 2021, 10 a.m. 4.4 ppb (5) -0.2 ppb (0) 5.0 ppb (5) 5.0 ppb (5) N/A -1.0 ppb (0) 23.0 ppb (22) 0.2 ppb (3) 14.0 μg/m3 (13) 8.2 μg/m3 (35) 35.0
 
April 18, 2021, 9 a.m. 4.6 ppb (5) -0.2 ppb (0) 5.0 ppb (5) 5.0 ppb (5) N/A -1.0 ppb (0) 24.0 ppb (23) N/A 13.0 μg/m3 (13) 7.7 μg/m3 (33) 33.0
 
April 18, 2021, 8 a.m. 3.7 ppb (4) -0.2 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A -1.0 ppb (0) 27.0 ppb (25) N/A 13.9 μg/m3 (13) 7.8 μg/m3 (33) 33.0
 
April 18, 2021, 7 a.m. 4.0 ppb (4) -0.2 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A N/A 25.0 ppb (24) 0.22 ppb (3) 12.1 μg/m3 (12) 7.5 μg/m3 (32) 32.0
 
April 18, 2021, 6 a.m. 3.6 ppb (4) -0.2 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A -1.0 ppb (0) 29.0 ppb (27) 0.21 ppb (3) 11.9 μg/m3 (12) 7.4 μg/m3 (31) 31.0
 
April 18, 2021, 5 a.m. 4.1 ppb (4) -0.2 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 32.0 ppb (30) 0.22 ppb (3) 13.0 μg/m3 (13) 7.5 μg/m3 (32) 32.0
 
April 18, 2021, 4 a.m. 4.8 ppb (5) -0.1 ppb (0) 5.0 ppb (5) 5.0 ppb (5) N/A 0.0 ppb (0) 31.0 ppb (29) 0.24 ppb (3) N/A N/A 29.0
 
April 18, 2021, 3 a.m. 6.1 ppb (6) -0.1 ppb (0) 7.0 ppb (7) 6.0 ppb (6) N/A -1.0 ppb (0) 30.0 ppb (28) 0.25 ppb (3) 13.9 μg/m3 (13) 7.7 μg/m3 (33) 33.0
 
April 18, 2021, 2 a.m. 6.1 ppb (6) -0.1 ppb (0) 8.0 ppb (8) 6.0 ppb (6) N/A -1.0 ppb (0) 33.0 ppb (31) 0.24 ppb (3) 13.1 μg/m3 (13) 7.7 μg/m3 (33) 33.0
 
April 18, 2021, 1 a.m. 7.0 ppb (7) -0.2 ppb (0) 8.0 ppb (8) 7.0 ppb (7) N/A 0.0 ppb (0) 34.0 ppb (32) 0.27 ppb (4) 14.6 μg/m3 (14) 8.6 μg/m3 (36) 36.0
 
April 18, 2021, midnight 7.5 ppb (8) -0.1 ppb (0) 8.0 ppb (8) 8.0 ppb (8) N/A 0.0 ppb (0) 39.0 ppb (37) 0.27 ppb (4) 14.6 μg/m3 (14) 8.0 μg/m3 (34) 37.0
 
April 17, 2021, 11 p.m. 3.5 ppb (4) -0.1 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 48.0 ppb (45) 0.21 ppb (3) 14.3 μg/m3 (14) 7.5 μg/m3 (32) 45.0
 
April 17, 2021, 10 p.m. 2.4 ppb (3) 0.0 ppb (0) 2.0 ppb (2) 3.0 ppb (3) N/A 0.0 ppb (0) 50.0 ppb (47) 0.19 ppb (3) 14.5 μg/m3 (14) 7.0 μg/m3 (30) 47.0
 
April 17, 2021, 9 p.m. 2.7 ppb (3) 0.1 ppb (1) 3.0 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 50.0 ppb (47) 0.19 ppb (3) 13.3 μg/m3 (13) 6.8 μg/m3 (29) 47.0
 
April 17, 2021, 8 p.m. 2.7 ppb (3) 0.1 ppb (1) 3.0 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) 48.0 ppb (45) 0.19 ppb (3) 16.7 μg/m3 (16) 8.1 μg/m3 (34) 45.0
 
April 17, 2021, 7 p.m. 3.6 ppb (4) 0.2 ppb (1) 4.0 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 49.0 ppb (46) 0.19 ppb (3) 15.1 μg/m3 (14) 7.9 μg/m3 (33) 46.0
 
April 17, 2021, 6 p.m. 5.0 ppb (5) 0.5 ppb (1) 5.0 ppb (5) 5.0 ppb (5) N/A 0.0 ppb (0) 50.0 ppb (47) 0.2 ppb (3) 15.2 μg/m3 (15) 7.6 μg/m3 (32) 47.0
 
April 17, 2021, 5 p.m. 8.6 ppb (9) 1.4 ppb (2) 9.0 ppb (9) 7.0 ppb (7) N/A 0.0 ppb (0) 41.0 ppb (38) 0.21 ppb (3) 15.1 μg/m3 (14) 7.1 μg/m3 (30) 38.0
 
April 17, 2021, 4 p.m. 6.7 ppb (7) 1.2 ppb (2) 7.0 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 40.0 ppb (38) 0.21 ppb (3) 14.2 μg/m3 (14) 7.0 μg/m3 (30) 38.0
 
April 17, 2021, 3 p.m. 4.6 ppb (5) 0.5 ppb (1) 5.0 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (36) 0.2 ppb (3) 12.2 μg/m3 (12) 6.4 μg/m3 (27) 36.0
 
April 17, 2021, 2 p.m. 10.4 ppb (10) 2.3 ppb (3) 11.0 ppb (11) 8.0 ppb (8) N/A 0.0 ppb (0) 24.0 ppb (23) 0.28 ppb (4) 21.0 μg/m3 (20) 10.5 μg/m3 (44) 44.0
 
April 17, 2021, 1 p.m. 22.4 ppb (22) 10.3 ppb (10) 24.0 ppb (23) 12.0 ppb (12) N/A 0.0 ppb (0) 5.0 ppb (5) 0.38 ppb (5) 21.1 μg/m3 (20) 12.0 μg/m3 (50) 50.0
 
April 17, 2021, noon 23.7 ppb (23) 12.2 ppb (12) 26.0 ppb (25) 12.0 ppb (12) N/A 0.0 ppb (0) 1.0 ppb (1) 0.38 ppb (5) 20.8 μg/m3 (20) 12.1 μg/m3 (51) 51.0
 
April 17, 2021, 11 a.m. 14.2 ppb (14) 2.8 ppb (3) 17.0 ppb (17) 12.0 ppb (12) N/A N/A 0.0 ppb (0) 0.32 ppb (4) 20.3 μg/m3 (19) 12.5 μg/m3 (52) 52.0
 
April 17, 2021, 10 a.m. 14.9 ppb (15) 1.5 ppb (2) 17.0 ppb (17) 14.0 ppb (14) N/A -1.0 ppb (0) 0.0 ppb (0) 0.31 ppb (4) 20.2 μg/m3 (19) 12.2 μg/m3 (52) 52.0
 
April 17, 2021, 9 a.m. 16.4 ppb (16) 0.9 ppb (1) 18.0 ppb (17) 16.0 ppb (16) N/A -1.0 ppb (0) 1.0 ppb (1) 0.32 ppb (4) 19.6 μg/m3 (19) 12.5 μg/m3 (52) 52.0
 
April 17, 2021, 8 a.m. 12.1 ppb (12) 0.5 ppb (1) 14.0 ppb (14) 12.0 ppb (12) N/A -1.0 ppb (0) 7.0 ppb (7) 0.29 ppb (4) 19.1 μg/m3 (18) 12.2 μg/m3 (52) 52.0
 
April 17, 2021, 7 a.m. 10.1 ppb (10) 0.0 ppb (0) 11.0 ppb (11) 10.0 ppb (10) N/A -1.0 ppb (0) 12.0 ppb (12) 0.28 ppb (4) 20.5 μg/m3 (19) 12.2 μg/m3 (52) 52.0
 
April 17, 2021, 6 a.m. 15.0 ppb (15) 0.1 ppb (1) 17.0 ppb (17) 15.0 ppb (15) N/A N/A 10.0 ppb (10) 0.3 ppb (4) 21.2 μg/m3 (20) 11.2 μg/m3 (47) 47.0
 
April 17, 2021, 5 a.m. 26.8 ppb (26) 3.1 ppb (3) 29.0 ppb (28) 24.0 ppb (23) N/A 0.0 ppb (0) 5.0 ppb (5) 0.38 ppb (5) 21.5 μg/m3 (20) 12.4 μg/m3 (52) 52.0
 
April 17, 2021, 4 a.m. 34.0 ppb (33) 6.0 ppb (6) 41.0 ppb (39) 28.0 ppb (27) N/A 0.0 ppb (0) 0.0 ppb (0) 0.44 ppb (5) N/A N/A 39.0
 
April 17, 2021, 3 a.m. 21.0 ppb (20) 3.0 ppb (3) 30.0 ppb (29) 18.0 ppb (17) N/A 0.0 ppb (0) 9.0 ppb (9) 0.34 ppb (4) 29.7 μg/m3 (28) 18.0 μg/m3 (64) 64.0
 
April 17, 2021, 2 a.m. 7.9 ppb (8) -0.1 ppb (0) 10.0 ppb (10) 8.0 ppb (8) N/A 0.0 ppb (0) 23.0 ppb (22) 0.27 ppb (4) 29.7 μg/m3 (28) 19.2 μg/m3 (66) 66.0
 
April 17, 2021, 1 a.m. 6.5 ppb (7) -0.1 ppb (0) 7.0 ppb (7) 7.0 ppb (7) N/A 0.0 ppb (0) 31.0 ppb (29) 0.26 ppb (4) 30.1 μg/m3 (28) 20.8 μg/m3 (70) 70.0
 
April 17, 2021, midnight 4.8 ppb (5) -0.1 ppb (0) 5.0 ppb (5) 5.0 ppb (5) N/A 0.0 ppb (0) 37.0 ppb (35) 0.24 ppb (3) 26.8 μg/m3 (25) 16.6 μg/m3 (61) 61.0
 
April 16, 2021, 11 p.m. 3.6 ppb (4) -0.1 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 40.0 ppb (38) 0.19 ppb (3) 14.5 μg/m3 (14) 6.0 μg/m3 (25) 38.0
 
April 16, 2021, 10 p.m. 4.2 ppb (4) 0.0 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 42.0 ppb (39) 0.19 ppb (3) 15.4 μg/m3 (15) 6.1 μg/m3 (26) 39.0
 
April 16, 2021, 9 p.m. 7.4 ppb (7) 1.1 ppb (2) 6.0 ppb (6) 6.0 ppb (6) N/A 0.0 ppb (0) 46.0 ppb (43) 0.38 ppb (5) 26.4 μg/m3 (25) 7.7 μg/m3 (33) 43.0
 
April 16, 2021, 8 p.m. 5.2 ppb (5) 1.1 ppb (2) 4.0 ppb (4) 4.0 ppb (4) N/A 0.0 ppb (0) 48.0 ppb (45) 0.47 ppb (6) 18.7 μg/m3 (18) 6.6 μg/m3 (28) 45.0
 
April 16, 2021, 7 p.m. 1.8 ppb (2) 0.0 ppb (0) 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 46.0 ppb (43) 0.16 ppb (3) 13.2 μg/m3 (13) 5.2 μg/m3 (22) 43.0
 
April 16, 2021, 6 p.m. 1.3 ppb (2) 0.0 ppb (0) 1.0 ppb (1) 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (41) 0.16 ppb (3) 12.6 μg/m3 (12) 4.8 μg/m3 (20) 41.0
 
April 16, 2021, 5 p.m. 1.5 ppb (2) 0.0 ppb (0) 1.0 ppb (1) 2.0 ppb (2) N/A 0.0 ppb (0) 41.0 ppb (38) 0.16 ppb (3) 15.0 μg/m3 (14) 4.8 μg/m3 (20) 38.0
 
April 16, 2021, 4 p.m. 1.8 ppb (2) 0.1 ppb (1) 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) 37.0 ppb (35) 0.16 ppb (3) 13.0 μg/m3 (13) 4.4 μg/m3 (19) 35.0
 
April 16, 2021, 3 p.m. 2.5 ppb (3) 0.3 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (31) 0.16 ppb (3) 11.1 μg/m3 (11) 4.0 μg/m3 (17) 31.0
 
April 16, 2021, 2 p.m. 6.3 ppb (6) 1.2 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 27.0 ppb (25) 0.2 ppb (3) 12.2 μg/m3 (12) 4.3 μg/m3 (18) 25.0
 
April 16, 2021, 1 p.m. 14.0 ppb (14) 2.7 ppb (3) N/A 11.0 ppb (11) N/A 0.0 ppb (0) 17.0 ppb (16) 0.25 ppb (3) 13.4 μg/m3 (13) 6.0 μg/m3 (25) 25.0
 
April 16, 2021, noon 19.1 ppb (19) 5.0 ppb (5) 21.0 ppb (20) 14.0 ppb (14) N/A 0.0 ppb (0) 8.0 ppb (8) 0.26 ppb (4) 12.4 μg/m3 (12) 4.9 μg/m3 (21) 21.0
 
April 16, 2021, 11 a.m. 20.9 ppb (20) 2.1 ppb (2) 23.0 ppb (22) 19.0 ppb (18) N/A -1.0 ppb (0) 4.0 ppb (4) 0.23 ppb (3) 9.6 μg/m3 (9) 4.6 μg/m3 (20) 22.0
 
April 16, 2021, 10 a.m. 17.2 ppb (17) 0.2 ppb (1) 20.0 ppb (19) 17.0 ppb (17) N/A -1.0 ppb (0) 6.0 ppb (6) 0.2 ppb (3) 9.2 μg/m3 (9) 4.3 μg/m3 (18) 19.0
 
April 16, 2021, 9 a.m. 6.8 ppb (7) -0.2 ppb (0) 8.0 ppb (8) 7.0 ppb (7) N/A -1.0 ppb (0) 19.0 ppb (18) 0.16 ppb (3) 9.6 μg/m3 (9) 4.1 μg/m3 (18) 18.0
 
April 16, 2021, 8 a.m. 5.0 ppb (5) -0.2 ppb (0) 6.0 ppb (6) 5.0 ppb (5) N/A -1.0 ppb (0) 22.0 ppb (21) 0.16 ppb (3) 9.2 μg/m3 (9) 4.1 μg/m3 (18) 21.0
 
April 16, 2021, 7 a.m. 3.6 ppb (4) -0.2 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A -1.0 ppb (0) 24.0 ppb (23) 0.15 ppb (2) 11.6 μg/m3 (11) 4.4 μg/m3 (19) 23.0
 
April 16, 2021, 6 a.m. 4.3 ppb (5) -0.2 ppb (0) 4.0 ppb (4) 5.0 ppb (5) N/A -1.0 ppb (0) 27.0 ppb (25) 0.18 ppb (3) 9.8 μg/m3 (10) 4.3 μg/m3 (18) 25.0
 
April 16, 2021, 5 a.m. 3.5 ppb (4) -0.3 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A -1.0 ppb (0) 29.0 ppb (27) 0.18 ppb (3) 9.7 μg/m3 (9) 4.4 μg/m3 (19) 27.0
 
April 16, 2021, 4 a.m. 3.5 ppb (4) -0.2 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A -1.0 ppb (0) 31.0 ppb (29) 0.19 ppb (3) N/A N/A 29.0
 
April 16, 2021, 3 a.m. 3.7 ppb (4) -0.2 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A -1.0 ppb (0) 34.0 ppb (32) 0.19 ppb (3) 11.2 μg/m3 (11) 4.5 μg/m3 (19) 32.0
 
April 16, 2021, 2 a.m. 4.1 ppb (4) -0.2 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A -1.0 ppb (0) 37.0 ppb (35) 0.21 ppb (3) 15.7 μg/m3 (15) 6.8 μg/m3 (29) 35.0
 
April 16, 2021, 1 a.m. 7.2 ppb (7) -0.2 ppb (0) 8.0 ppb (8) 8.0 ppb (8) N/A 0.0 ppb (0) 36.0 ppb (34) 0.23 ppb (3) 19.8 μg/m3 (19) 9.0 μg/m3 (38) 38.0
 
April 16, 2021, midnight 5.1 ppb (5) -0.2 ppb (0) 6.0 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 41.0 ppb (38) 0.2 ppb (3) 16.8 μg/m3 (16) 6.1 μg/m3 (26) 38.0
 
April 15, 2021, 11 p.m. N/A N/A 5.0 ppb (5) N/A N/A 0.0 ppb (0) 44.0 ppb (41) 0.2 ppb (3) 19.1 μg/m3 (18) 6.3 μg/m3 (27) 41.0
 
April 15, 2021, 10 p.m. N/A N/A 4.0 ppb (4) N/A N/A 0.0 ppb (0) 48.0 ppb (45) 0.21 ppb (3) 17.7 μg/m3 (17) 6.2 μg/m3 (26) 45.0
 
April 15, 2021, 9 p.m. N/A N/A 4.0 ppb (4) N/A N/A 0.0 ppb (0) 50.0 ppb (47) 0.2 ppb (3) 17.6 μg/m3 (17) 6.1 μg/m3 (26) 47.0
 
April 15, 2021, 8 p.m. N/A N/A 4.0 ppb (4) N/A N/A 0.0 ppb (0) 50.0 ppb (47) 0.2 ppb (3) 19.8 μg/m3 (19) 6.0 μg/m3 (25) 47.0
 
April 15, 2021, 7 p.m. N/A N/A 4.0 ppb (4) N/A N/A 0.0 ppb (0) 48.0 ppb (45) 0.19 ppb (3) 18.8 μg/m3 (18) 5.7 μg/m3 (24) 45.0
 
April 15, 2021, 6 p.m. 4.4 ppb (5) 0.6 ppb (1) 5.0 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 45.0 ppb (42) 0.2 ppb (3) 21.2 μg/m3 (20) 6.5 μg/m3 (28) 42.0
 
April 15, 2021, 5 p.m. 5.3 ppb (5) 0.9 ppb (1) 5.0 ppb (5) 5.0 ppb (5) N/A 0.0 ppb (0) 39.0 ppb (37) 0.21 ppb (3) 18.7 μg/m3 (18) 7.5 μg/m3 (32) 37.0
 
April 15, 2021, 4 p.m. 5.7 ppb (6) 0.9 ppb (1) 6.0 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 34.0 ppb (32) 0.22 ppb (3) 15.7 μg/m3 (15) 7.6 μg/m3 (32) 32.0
 
April 15, 2021, 3 p.m. 8.7 ppb (9) 1.8 ppb (2) 9.0 ppb (9) 7.0 ppb (7) N/A 0.0 ppb (0) 28.0 ppb (26) 0.25 ppb (3) 15.4 μg/m3 (15) 8.4 μg/m3 (36) 36.0
 
April 15, 2021, 2 p.m. 9.1 ppb (9) 1.7 ppb (2) 10.0 ppb (10) 8.0 ppb (8) N/A -1.0 ppb (0) 26.0 ppb (25) 0.25 ppb (3) 16.4 μg/m3 (16) 9.5 μg/m3 (40) 40.0
 
April 15, 2021, 1 p.m. 9.0 ppb (9) 1.3 ppb (2) 10.0 ppb (10) 8.0 ppb (8) N/A -1.0 ppb (0) 25.0 ppb (24) 0.24 ppb (3) 13.2 μg/m3 (13) 8.3 μg/m3 (35) 35.0
 
April 15, 2021, noon 9.7 ppb (10) 0.7 ppb (1) 11.0 ppb (11) 9.0 ppb (9) N/A -1.0 ppb (0) 17.0 ppb (16) 0.26 ppb (4) 10.6 μg/m3 (10) 6.6 μg/m3 (28) 28.0
 
April 15, 2021, 11 a.m. 7.9 ppb (8) 0.0 ppb (0) 9.0 ppb (9) 8.0 ppb (8) N/A -1.0 ppb (0) 17.0 ppb (16) 0.24 ppb (3) 9.4 μg/m3 (9) 5.6 μg/m3 (24) 24.0
 
April 15, 2021, 10 a.m. 5.6 ppb (6) -0.2 ppb (0) 6.0 ppb (6) 6.0 ppb (6) N/A -1.0 ppb (0) 20.0 ppb (19) 0.22 ppb (3) 8.8 μg/m3 (9) 4.9 μg/m3 (21) 21.0
 
April 15, 2021, 9 a.m. 4.2 ppb (4) -0.2 ppb (0) 4.0 ppb (4) 4.0 ppb (4) N/A -1.0 ppb (0) 24.0 ppb (23) 0.21 ppb (3) 10.9 μg/m3 (11) 7.3 μg/m3 (31) 31.0
 
April 15, 2021, 8 a.m. 4.9 ppb (5) -0.2 ppb (0) 5.0 ppb (5) 5.0 ppb (5) N/A -1.0 ppb (0) 25.0 ppb (24) 0.22 ppb (3) 14.8 μg/m3 (14) 9.3 μg/m3 (39) 39.0
 
April 15, 2021, 7 a.m. 4.7 ppb (5) -0.1 ppb (0) 5.0 ppb (5) 5.0 ppb (5) N/A -1.0 ppb (0) 27.0 ppb (25) 0.21 ppb (3) 18.1 μg/m3 (17) 11.5 μg/m3 (48) 48.0
 
April 15, 2021, 6 a.m. 5.5 ppb (6) -0.1 ppb (0) 6.0 ppb (6) 6.0 ppb (6) N/A -1.0 ppb (0) 21.0 ppb (20) 0.21 ppb (3) 22.2 μg/m3 (21) 13.7 μg/m3 (55) 55.0
 
April 15, 2021, 5 a.m. 7.9 ppb (8) -0.1 ppb (0) 9.0 ppb (9) 8.0 ppb (8) N/A -1.0 ppb (0) 17.0 ppb (16) 0.22 ppb (3) 21.2 μg/m3 (20) 12.0 μg/m3 (50) 50.0
 
April 15, 2021, 4 a.m. 6.8 ppb (7) -0.1 ppb (0) 8.0 ppb (8) 7.0 ppb (7) N/A N/A 20.0 ppb (19) 0.21 ppb (3) 20.7 μg/m3 (20) 12.0 μg/m3 (50) 50.0
 
April 15, 2021, 3 a.m. 6.9 ppb (7) -0.1 ppb (0) 8.0 ppb (8) 7.0 ppb (7) N/A -1.0 ppb (0) 23.0 ppb (22) 0.21 ppb (3) 21.5 μg/m3 (20) 11.5 μg/m3 (48) 48.0
 
April 15, 2021, 2 a.m. 5.4 ppb (6) -0.1 ppb (0) 6.0 ppb (6) 6.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (27) 0.2 ppb (3) 20.9 μg/m3 (20) 11.1 μg/m3 (47) 47.0
 
April 15, 2021, 1 a.m. 7.2 ppb (7) -0.1 ppb (0) 8.0 ppb (8) 7.0 ppb (7) N/A 0.0 ppb (0) 29.0 ppb (27) 0.21 ppb (3) 19.5 μg/m3 (19) 10.5 μg/m3 (44) 44.0
 
April 15, 2021, midnight 10.8 ppb (11) -0.1 ppb (0) 12.0 ppb (12) 11.0 ppb (11) N/A 0.0 ppb (0) 27.0 ppb (25) 0.23 ppb (3) 18.3 μg/m3 (17) 9.6 μg/m3 (40) 40.0
 
April 14, 2021, 11 p.m. 5.7 ppb (6) 0.0 ppb (0) 6.0 ppb (6) 6.0 ppb (6) N/A -1.0 ppb (0) 31.0 ppb (29) 0.21 ppb (3) 18.7 μg/m3 (18) 9.8 μg/m3 (41) 41.0
 
April 14, 2021, 10 p.m. 9.4 ppb (9) 0.2 ppb (1) 10.0 ppb (10) 9.0 ppb (9) N/A -1.0 ppb (0) 28.0 ppb (26) 0.22 ppb (3) 20.1 μg/m3 (19) 9.5 μg/m3 (40) 40.0
 
April 14, 2021, 9 p.m. 5.4 ppb (6) 0.1 ppb (1) 6.0 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 38.0 ppb (36) 0.19 ppb (3) 24.7 μg/m3 (23) 9.7 μg/m3 (41) 41.0
 
April 14, 2021, 8 p.m. 5.6 ppb (6) 0.1 ppb (1) 6.0 ppb (6) 6.0 ppb (6) N/A 0.0 ppb (0) 49.0 ppb (46) 0.2 ppb (3) 36.6 μg/m3 (34) 17.0 μg/m3 (62) 62.0