ID: 1803

AQSQID: 160010010

Site Name: St. Lukes Meridian

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

Updated: March 3, 2021, 11:32 p.m.

Location: Meridian (Whiteriver Dr), ID

Reporting: True, Located: True

Current AQI: 39.0

Meridian (Whiteriver Dr) ID, US: 43.600699, -116.347853

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Feb. 24, 2021, 10 p.m. 2.6 ppb (3) 0.5 ppb (1) 3.0 ppb (3) 2.0 ppb (2) 1.7 ppb (2) 0.0 ppb (0) 41.0 ppb (38) 0.15 ppb (2) N/A 7.0 μg/m3 (30) 38.0
 
Feb. 24, 2021, 9 p.m. 2.6 ppb (3) 0.7 ppb (1) 2.9 ppb (3) 2.0 ppb (2) 1.6 ppb (2) 0.0 ppb (0) 41.0 ppb (38) 0.14 ppb (2) N/A 4.0 μg/m3 (17) 38.0
 
Feb. 24, 2021, 8 p.m. 1.6 ppb (2) 0.1 ppb (1) 2.4 ppb (3) 1.0 ppb (1) 1.3 ppb (2) 0.0 ppb (0) 41.0 ppb (38) 0.14 ppb (2) N/A 1.0 μg/m3 (5) 38.0
 
Feb. 24, 2021, 7 p.m. 2.8 ppb (3) 0.7 ppb (1) 3.0 ppb (3) 2.0 ppb (2) 1.8 ppb (2) 0.0 ppb (0) 40.0 ppb (38) 0.14 ppb (2) N/A 3.0 μg/m3 (13) 38.0
 
Feb. 24, 2021, 6 p.m. 3.2 ppb (4) 0.9 ppb (1) 3.5 ppb (4) 2.0 ppb (2) 2.1 ppb (2) 0.0 ppb (0) 39.0 ppb (37) 0.15 ppb (2) N/A 2.0 μg/m3 (9) 37.0
 
Feb. 24, 2021, 5 p.m. 4.1 ppb (4) 1.3 ppb (2) 4.5 ppb (5) 3.0 ppb (3) 2.6 ppb (3) 0.0 ppb (0) 38.0 ppb (36) 0.15 ppb (2) N/A 2.0 μg/m3 (9) 36.0
 
Feb. 24, 2021, 4 p.m. 7.1 ppb (7) 1.6 ppb (2) 7.3 ppb (7) 5.0 ppb (5) 4.9 ppb (5) 0.0 ppb (0) 34.0 ppb (32) 0.16 ppb (3) N/A 3.0 μg/m3 (13) 32.0
 
Feb. 24, 2021, 3 p.m. 10.3 ppb (10) 1.0 ppb (1) 10.5 ppb (10) 9.0 ppb (9) 8.0 ppb (8) 0.0 ppb (0) 28.0 ppb (26) 0.18 ppb (3) N/A 5.0 μg/m3 (21) 26.0
 
Feb. 24, 2021, 2 p.m. 15.4 ppb (15) 0.8 ppb (1) 15.2 ppb (15) 15.0 ppb (15) 12.3 ppb (12) 0.0 ppb (0) 23.0 ppb (22) 0.22 ppb (3) N/A 5.0 μg/m3 (21) 22.0
 
Feb. 24, 2021, 1 p.m. 9.4 ppb (9) 0.3 ppb (1) 9.8 ppb (10) 9.0 ppb (9) 8.3 ppb (8) 0.0 ppb (0) 25.0 ppb (24) 0.18 ppb (3) N/A 3.0 μg/m3 (13) 24.0
 
Feb. 24, 2021, noon 5.7 ppb (6) 0.2 ppb (1) 6.3 ppb (6) 6.0 ppb (6) 5.2 ppb (5) 0.0 ppb (0) 29.0 ppb (27) 0.17 ppb (3) N/A 6.0 μg/m3 (25) 27.0
 
Feb. 24, 2021, 11 a.m. 7.0 ppb (7) 0.2 ppb (1) 7.9 ppb (8) 7.0 ppb (7) 6.3 ppb (6) 0.0 ppb (0) 32.0 ppb (30) 0.16 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 24, 2021, 10 a.m. 10.3 ppb (10) -0.1 ppb (0) 10.5 ppb (10) 10.0 ppb (10) 9.0 ppb (9) 0.0 ppb (0) 22.0 ppb (21) 0.18 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 24, 2021, 9 a.m. 10.0 ppb (10) -0.2 ppb (0) 11.3 ppb (11) 10.0 ppb (10) 9.8 ppb (10) 0.0 ppb (0) 18.0 ppb (17) 0.18 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 24, 2021, 8 a.m. 16.1 ppb (16) -0.1 ppb (0) 15.9 ppb (15) 16.0 ppb (16) 13.7 ppb (13) 0.0 ppb (0) 17.0 ppb (16) 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 24, 2021, 7 a.m. 15.9 ppb (15) -0.1 ppb (0) 15.8 ppb (15) 16.0 ppb (16) 13.7 ppb (13) 0.0 ppb (0) 20.0 ppb (19) 0.25 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 24, 2021, 6 a.m. 20.9 ppb (20) 0.1 ppb (1) 22.4 ppb (22) 21.0 ppb (20) 19.4 ppb (19) 0.0 ppb (0) 15.0 ppb (14) 0.29 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 24, 2021, 5 a.m. 14.7 ppb (14) 0.5 ppb (1) 11.6 ppb (11) 14.0 ppb (14) 9.8 ppb (10) 0.0 ppb (0) 25.0 ppb (24) 0.23 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 24, 2021, 4 a.m. 36.8 ppb (35) 3.6 ppb (4) 34.7 ppb (33) 33.0 ppb (32) 27.0 ppb (26) 0.0 ppb (0) 7.0 ppb (7) 0.32 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 24, 2021, 3 a.m. 31.8 ppb (30) 5.8 ppb (6) 31.6 ppb (30) 26.0 ppb (25) 23.2 ppb (22) 0.0 ppb (0) 14.0 ppb (13) 0.41 ppb (5) N/A 6.0 μg/m3 (25) 30.0
 
Feb. 24, 2021, 2 a.m. 7.4 ppb (7) -0.2 ppb (0) 5.3 ppb (5) 8.0 ppb (8) 4.4 ppb (5) 0.0 ppb (0) 35.0 ppb (33) 0.18 ppb (3) N/A 0.0 μg/m3 (0) 33.0
 
Feb. 24, 2021, 1 a.m. 2.9 ppb (3) -0.2 ppb (0) 3.0 ppb (3) 3.0 ppb (3) 2.5 ppb (3) 0.0 ppb (0) 40.0 ppb (38) 0.16 ppb (3) N/A 1.0 μg/m3 (5) 38.0
 
Feb. 24, 2021, midnight 1.8 ppb (2) 0.0 ppb (0) 2.1 ppb (2) 2.0 ppb (2) 1.5 ppb (2) 0.0 ppb (0) 43.0 ppb (40) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 40.0
 
Feb. 23, 2021, 11 p.m. 1.8 ppb (2) 0.3 ppb (1) 2.0 ppb (2) 2.0 ppb (2) 1.3 ppb (2) 0.0 ppb (0) 43.0 ppb (40) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 40.0
 
Feb. 23, 2021, 10 p.m. 2.0 ppb (2) 0.6 ppb (1) 2.0 ppb (2) 1.0 ppb (1) 1.2 ppb (2) 0.0 ppb (0) 44.0 ppb (41) 0.15 ppb (2) N/A 2.0 μg/m3 (9) 41.0
 
Feb. 23, 2021, 9 p.m. 2.5 ppb (3) 0.7 ppb (1) 2.6 ppb (3) 2.0 ppb (2) 1.6 ppb (2) 0.0 ppb (0) 43.0 ppb (40) 0.15 ppb (2) N/A 1.0 μg/m3 (5) 40.0
 
Feb. 23, 2021, 8 p.m. 1.9 ppb (2) 0.7 ppb (1) 1.7 ppb (2) 1.0 ppb (1) 1.0 ppb (1) 0.0 ppb (0) 44.0 ppb (41) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 41.0
 
Feb. 23, 2021, 7 p.m. 2.0 ppb (2) 0.4 ppb (1) 2.4 ppb (3) 2.0 ppb (2) 1.4 ppb (2) 0.0 ppb (0) 44.0 ppb (41) 0.14 ppb (2) N/A 5.0 μg/m3 (21) 41.0
 
Feb. 23, 2021, 6 p.m. 3.0 ppb (3) 0.7 ppb (1) 3.4 ppb (4) 2.0 ppb (2) 2.0 ppb (2) 0.0 ppb (0) 44.0 ppb (41) 0.15 ppb (2) N/A 4.0 μg/m3 (17) 41.0
 
Feb. 23, 2021, 5 p.m. 4.8 ppb (5) 1.3 ppb (2) 5.3 ppb (5) 4.0 ppb (4) 3.2 ppb (4) 0.0 ppb (0) 40.0 ppb (38) 0.15 ppb (2) N/A 5.0 μg/m3 (21) 38.0
 
Feb. 23, 2021, 4 p.m. 6.9 ppb (7) 1.6 ppb (2) 7.1 ppb (7) 5.0 ppb (5) 4.7 ppb (5) 0.0 ppb (0) 39.0 ppb (37) 0.16 ppb (3) N/A 2.0 μg/m3 (9) 37.0
 
Feb. 23, 2021, 3 p.m. 12.7 ppb (12) 1.6 ppb (2) 12.7 ppb (12) 11.0 ppb (11) 9.3 ppb (9) 0.0 ppb (0) 33.0 ppb (31) 0.19 ppb (3) N/A 2.0 μg/m3 (9) 31.0
 
Feb. 23, 2021, 2 p.m. 12.8 ppb (13) 0.6 ppb (1) 12.4 ppb (12) 12.0 ppb (12) 10.1 ppb (10) 0.0 ppb (0) 29.0 ppb (27) 0.19 ppb (3) N/A 4.0 μg/m3 (17) 27.0
 
Feb. 23, 2021, 1 p.m. 6.1 ppb (6) 0.0 ppb (0) 6.4 ppb (7) 6.0 ppb (6) 5.2 ppb (5) 0.0 ppb (0) 33.0 ppb (31) 0.15 ppb (2) N/A 5.0 μg/m3 (21) 31.0
 
Feb. 23, 2021, noon 3.1 ppb (3) 0.3 ppb (1) 3.3 ppb (4) 3.0 ppb (3) 2.5 ppb (3) 0.0 ppb (0) 37.0 ppb (35) 0.13 ppb (2) N/A 3.0 μg/m3 (13) 35.0
 
Feb. 23, 2021, 11 a.m. 1.8 ppb (2) -0.2 ppb (0) 2.6 ppb (3) 2.0 ppb (2) 2.0 ppb (2) 0.0 ppb (0) 38.0 ppb (36) 0.13 ppb (2) N/A 4.0 μg/m3 (17) 36.0
 
Feb. 23, 2021, 10 a.m. 1.9 ppb (2) -0.1 ppb (0) 2.7 ppb (3) 2.0 ppb (2) 2.1 ppb (2) 0.0 ppb (0) 35.0 ppb (33) 0.13 ppb (2) N/A 3.0 μg/m3 (13) 33.0
 
Feb. 23, 2021, 9 a.m. 1.1 ppb (2) -0.3 ppb (0) 1.8 ppb (2) 1.0 ppb (1) 1.4 ppb (2) 0.0 ppb (0) 31.0 ppb (29) 0.12 ppb (2) N/A 2.0 μg/m3 (9) 29.0
 
Feb. 23, 2021, 8 a.m. 1.7 ppb (2) -0.4 ppb (0) 2.5 ppb (3) 2.0 ppb (2) 2.0 ppb (2) 0.0 ppb (0) 30.0 ppb (28) 0.11 ppb (2) N/A 4.0 μg/m3 (17) 28.0
 
Feb. 23, 2021, 7 a.m. 6.1 ppb (6) -0.1 ppb (0) 6.0 ppb (6) 6.0 ppb (6) 4.9 ppb (5) 0.0 ppb (0) 27.0 ppb (25) 0.13 ppb (2) N/A 5.0 μg/m3 (21) 25.0
 
Feb. 23, 2021, 6 a.m. 7.0 ppb (7) 0.1 ppb (1) 6.3 ppb (6) 7.0 ppb (7) 5.1 ppb (5) 0.0 ppb (0) 28.0 ppb (26) 0.14 ppb (2) N/A 1.0 μg/m3 (5) 26.0
 
Feb. 23, 2021, 5 a.m. 4.4 ppb (5) 0.1 ppb (1) 4.6 ppb (5) 4.0 ppb (4) 3.7 ppb (4) 0.0 ppb (0) 32.0 ppb (30) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 30.0
 
Feb. 23, 2021, 4 a.m. 5.6 ppb (6) 0.1 ppb (1) 5.9 ppb (6) 6.0 ppb (6) 4.8 ppb (5) 0.0 ppb (0) 31.0 ppb (29) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 29.0
 
Feb. 23, 2021, 3 a.m. 6.6 ppb (7) 0.3 ppb (1) 6.7 ppb (7) 6.0 ppb (6) 5.5 ppb (6) 0.0 ppb (0) 30.0 ppb (28) 0.15 ppb (2) N/A 2.0 μg/m3 (9) 28.0
 
Feb. 23, 2021, 2 a.m. 9.8 ppb (10) 0.4 ppb (1) 9.3 ppb (9) 9.0 ppb (9) 7.7 ppb (8) 0.0 ppb (0) 27.0 ppb (25) 0.16 ppb (3) N/A 2.0 μg/m3 (9) 25.0
 
Feb. 23, 2021, 1 a.m. 15.2 ppb (15) 1.4 ppb (2) 14.6 ppb (14) 14.0 ppb (14) 11.5 ppb (11) 0.0 ppb (0) 24.0 ppb (23) 0.21 ppb (3) N/A 0.0 μg/m3 (0) 23.0
 
Feb. 23, 2021, midnight 5.3 ppb (5) 0.7 ppb (1) 5.2 ppb (5) 5.0 ppb (5) 3.9 ppb (4) 0.0 ppb (0) 36.0 ppb (34) 0.15 ppb (2) N/A -1.0 μg/m3 (0) 34.0
 
Feb. 22, 2021, 11 p.m. 4.9 ppb (5) 1.1 ppb (2) 4.3 ppb (5) 4.0 ppb (4) 2.9 ppb (3) 0.0 ppb (0) 38.0 ppb (36) 0.14 ppb (2) N/A 0.0 μg/m3 (0) 36.0
 
Feb. 22, 2021, 10 p.m. 3.6 ppb (4) 0.5 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 38.0 ppb (36) 0.14 ppb (2) N/A 3.0 μg/m3 (13) 36.0
 
Feb. 22, 2021, 9 p.m. 3.0 ppb (3) 0.5 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 39.0 ppb (37) 0.13 ppb (2) N/A 4.0 μg/m3 (17) 37.0
 
Feb. 22, 2021, 8 p.m. 7.1 ppb (7) 2.3 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 36.0 ppb (34) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 34.0
 
Feb. 22, 2021, 7 p.m. 6.8 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 34.0 ppb (32) 0.14 ppb (2) N/A 3.0 μg/m3 (13) 32.0
 
Feb. 22, 2021, 6 p.m. 7.2 ppb (7) 2.1 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 33.0 ppb (31) 0.15 ppb (2) N/A 2.0 μg/m3 (9) 31.0
 
Feb. 22, 2021, 5 p.m. 21.1 ppb (20) 7.6 ppb (8) N/A 14.0 ppb (14) N/A 0.0 ppb (0) 20.0 ppb (19) 0.2 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 22, 2021, 4 p.m. 34.7 ppb (33) 13.9 ppb (14) N/A 21.0 ppb (20) N/A 0.0 ppb (0) 10.0 ppb (10) 0.26 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 22, 2021, 3 p.m. 46.6 ppb (44) 20.2 ppb (20) 41.8 ppb (40) 26.0 ppb (25) 20.5 ppb (20) 1.0 ppb (2) 4.0 ppb (4) 0.3 ppb (4) N/A 8.0 μg/m3 (34) 44.0
 
Feb. 22, 2021, 2 p.m. 37.5 ppb (36) 11.0 ppb (11) 31.6 ppb (30) 26.0 ppb (25) 19.2 ppb (19) 0.0 ppb (0) 6.0 ppb (6) 0.34 ppb (4) N/A 1.0 μg/m3 (5) 36.0
 
Feb. 22, 2021, 1 p.m. 25.3 ppb (24) 4.2 ppb (4) 20.7 ppb (20) 21.0 ppb (20) 15.1 ppb (15) 0.0 ppb (0) 11.0 ppb (11) 0.26 ppb (4) N/A 1.0 μg/m3 (5) 24.0
 
Feb. 22, 2021, noon 17.5 ppb (17) 1.1 ppb (2) 14.3 ppb (14) 16.0 ppb (16) 11.6 ppb (11) 0.0 ppb (0) 15.0 ppb (14) 0.21 ppb (3) N/A 2.0 μg/m3 (9) 17.0
 
Feb. 22, 2021, 11 a.m. 12.3 ppb (12) 0.0 ppb (0) 10.0 ppb (10) 12.0 ppb (12) 8.3 ppb (8) 0.0 ppb (0) 19.0 ppb (18) 0.18 ppb (3) N/A 2.0 μg/m3 (9) 18.0
 
Feb. 22, 2021, 10 a.m. 8.2 ppb (8) 0.1 ppb (1) 7.2 ppb (7) 8.0 ppb (8) 5.9 ppb (6) 0.0 ppb (0) 24.0 ppb (23) 0.15 ppb (2) N/A 2.0 μg/m3 (9) 23.0
 
Feb. 22, 2021, 9 a.m. 4.6 ppb (5) -0.3 ppb (0) 4.6 ppb (5) 5.0 ppb (5) 3.7 ppb (4) 0.0 ppb (0) 28.0 ppb (26) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 26.0
 
Feb. 22, 2021, 8 a.m. 4.7 ppb (5) -0.3 ppb (0) 4.7 ppb (5) 5.0 ppb (5) 3.8 ppb (4) 0.0 ppb (0) 29.0 ppb (27) 0.15 ppb (2) N/A 1.0 μg/m3 (5) 27.0
 
Feb. 22, 2021, 7 a.m. 4.9 ppb (5) 0.1 ppb (1) 4.8 ppb (5) 5.0 ppb (5) 3.8 ppb (4) 0.0 ppb (0) 30.0 ppb (28) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 28.0
 
Feb. 22, 2021, 6 a.m. 3.8 ppb (4) -0.3 ppb (0) 4.0 ppb (4) 4.0 ppb (4) 3.2 ppb (4) 0.0 ppb (0) 31.0 ppb (29) 0.14 ppb (2) N/A 6.0 μg/m3 (25) 29.0
 
Feb. 22, 2021, 5 a.m. 6.7 ppb (7) 0.0 ppb (0) 6.5 ppb (7) 7.0 ppb (7) 5.2 ppb (5) 0.0 ppb (0) 28.0 ppb (26) 0.18 ppb (3) N/A 5.0 μg/m3 (21) 26.0
 
Feb. 22, 2021, 4 a.m. 9.0 ppb (9) 0.1 ppb (1) 8.5 ppb (9) 9.0 ppb (9) 7.0 ppb (7) 0.0 ppb (0) 26.0 ppb (25) 0.2 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 22, 2021, 3 a.m. 11.6 ppb (11) 0.1 ppb (1) 10.9 ppb (11) 12.0 ppb (12) 9.0 ppb (9) 0.0 ppb (0) 25.0 ppb (24) 0.23 ppb (3) N/A 5.0 μg/m3 (21) 24.0
 
Feb. 22, 2021, 2 a.m. 2.6 ppb (3) -0.3 ppb (0) 3.0 ppb (3) 3.0 ppb (3) 2.4 ppb (3) 0.0 ppb (0) 35.0 ppb (33) 0.15 ppb (2) N/A 5.0 μg/m3 (21) 33.0
 
Feb. 22, 2021, 1 a.m. 2.4 ppb (3) -0.2 ppb (0) 2.6 ppb (3) 3.0 ppb (3) 2.0 ppb (2) 0.0 ppb (0) 35.0 ppb (33) 0.14 ppb (2) N/A 3.0 μg/m3 (13) 33.0
 
Feb. 22, 2021, midnight 1.3 ppb (2) -0.4 ppb (0) 1.9 ppb (2) 2.0 ppb (2) 1.3 ppb (2) 0.0 ppb (0) 38.0 ppb (36) 0.14 ppb (2) N/A 3.0 μg/m3 (13) 36.0
 
Feb. 21, 2021, 11 p.m. 1.2 ppb (2) -0.2 ppb (0) 1.6 ppb (2) 1.0 ppb (1) 1.0 ppb (1) 0.0 ppb (0) 39.0 ppb (37) 0.13 ppb (2) N/A 2.0 μg/m3 (9) 37.0
 
Feb. 21, 2021, 10 p.m. 1.2 ppb (2) -0.2 ppb (0) 1.8 ppb (2) 1.0 ppb (1) 1.1 ppb (2) 0.0 ppb (0) 40.0 ppb (38) 0.13 ppb (2) N/A 1.0 μg/m3 (5) 38.0
 
Feb. 21, 2021, 9 p.m. 2.6 ppb (3) 0.4 ppb (1) 3.0 ppb (3) 2.0 ppb (2) 1.9 ppb (2) 0.0 ppb (0) 38.0 ppb (36) 0.14 ppb (2) N/A 4.0 μg/m3 (17) 36.0
 
Feb. 21, 2021, 8 p.m. 1.6 ppb (2) 0.1 ppb (1) 2.2 ppb (3) 1.0 ppb (1) 1.3 ppb (2) 0.0 ppb (0) 37.0 ppb (35) 0.13 ppb (2) N/A 4.0 μg/m3 (17) 35.0
 
Feb. 21, 2021, 7 p.m. 2.9 ppb (3) 0.4 ppb (1) 3.4 ppb (4) 2.0 ppb (2) 2.0 ppb (2) 0.0 ppb (0) 36.0 ppb (34) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 34.0
 
Feb. 21, 2021, 6 p.m. 4.2 ppb (4) 1.2 ppb (2) 4.4 ppb (5) 3.0 ppb (3) 2.5 ppb (3) 0.0 ppb (0) 35.0 ppb (33) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 33.0
 
Feb. 21, 2021, 5 p.m. 7.8 ppb (8) 2.0 ppb (2) 7.9 ppb (8) 6.0 ppb (6) 4.8 ppb (5) 0.0 ppb (0) 32.0 ppb (30) 0.16 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 21, 2021, 4 p.m. 19.4 ppb (19) 5.6 ppb (6) 19.3 ppb (19) 14.0 ppb (14) 11.7 ppb (12) 0.0 ppb (0) 21.0 ppb (20) 0.22 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 21, 2021, 3 p.m. 26.6 ppb (26) 6.3 ppb (6) 25.8 ppb (25) 20.0 ppb (19) 17.0 ppb (17) 0.0 ppb (0) 12.0 ppb (12) 0.24 ppb (3) N/A 13.0 μg/m3 (53) 53.0
 
Feb. 21, 2021, 2 p.m. 34.1 ppb (33) 5.7 ppb (6) 33.0 ppb (32) 28.0 ppb (27) 24.2 ppb (23) 0.0 ppb (0) 4.0 ppb (4) 0.32 ppb (4) N/A 16.0 μg/m3 (60) 60.0
 
Feb. 21, 2021, 1 p.m. 31.8 ppb (30) 4.9 ppb (5) 31.1 ppb (30) 27.0 ppb (26) 22.9 ppb (22) 0.0 ppb (0) 3.0 ppb (3) 0.32 ppb (4) N/A 19.0 μg/m3 (66) 66.0
 
Feb. 21, 2021, noon 29.4 ppb (28) 3.4 ppb (4) 29.5 ppb (28) 26.0 ppb (25) 22.2 ppb (21) 0.0 ppb (0) 4.0 ppb (4) 0.3 ppb (4) N/A 15.0 μg/m3 (58) 58.0
 
Feb. 21, 2021, 11 a.m. 21.9 ppb (21) 0.2 ppb (1) 21.7 ppb (21) 22.0 ppb (21) 18.5 ppb (18) 0.0 ppb (0) 10.0 ppb (10) 0.24 ppb (3) N/A 15.0 μg/m3 (58) 58.0
 
Feb. 21, 2021, 10 a.m. 19.0 ppb (18) 0.3 ppb (1) 18.3 ppb (18) 19.0 ppb (18) 15.5 ppb (15) 0.0 ppb (0) 15.0 ppb (14) 0.22 ppb (3) N/A 17.0 μg/m3 (62) 62.0
 
Feb. 21, 2021, 9 a.m. 20.7 ppb (20) 1.2 ppb (2) 20.1 ppb (19) 20.0 ppb (19) 16.4 ppb (16) 0.0 ppb (0) 15.0 ppb (14) 0.24 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 21, 2021, 8 a.m. 16.7 ppb (16) 1.0 ppb (1) 14.5 ppb (14) 16.0 ppb (16) 11.7 ppb (12) 0.0 ppb (0) 21.0 ppb (20) 0.23 ppb (3) N/A 13.0 μg/m3 (53) 53.0
 
Feb. 21, 2021, 7 a.m. 26.3 ppb (25) 1.2 ppb (2) 24.5 ppb (24) 25.0 ppb (24) 20.3 ppb (20) 0.0 ppb (0) 9.0 ppb (9) 0.34 ppb (4) N/A 15.0 μg/m3 (58) 58.0
 
Feb. 21, 2021, 6 a.m. 12.3 ppb (12) 0.2 ppb (1) 11.2 ppb (11) 12.0 ppb (12) 9.3 ppb (9) 0.0 ppb (0) 24.0 ppb (23) 0.25 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 21, 2021, 5 a.m. 8.8 ppb (9) 0.2 ppb (1) 9.0 ppb (9) 9.0 ppb (9) 7.3 ppb (7) 0.0 ppb (0) 29.0 ppb (27) 0.2 ppb (3) N/A 5.0 μg/m3 (21) 27.0
 
Feb. 21, 2021, 4 a.m. 5.6 ppb (6) -0.1 ppb (0) 5.6 ppb (6) 6.0 ppb (6) 4.5 ppb (5) 0.0 ppb (0) 34.0 ppb (32) 0.16 ppb (3) N/A 5.0 μg/m3 (21) 32.0
 
Feb. 21, 2021, 3 a.m. 5.1 ppb (5) -0.3 ppb (0) 5.4 ppb (6) 5.0 ppb (5) 4.4 ppb (5) 0.0 ppb (0) 33.0 ppb (31) 0.17 ppb (3) N/A 7.0 μg/m3 (30) 31.0
 
Feb. 21, 2021, 2 a.m. 4.1 ppb (4) -0.3 ppb (0) 4.6 ppb (5) 4.0 ppb (4) 3.7 ppb (4) 0.0 ppb (0) 36.0 ppb (34) 0.16 ppb (3) N/A 7.0 μg/m3 (30) 34.0
 
Feb. 21, 2021, 1 a.m. 2.9 ppb (3) -0.2 ppb (0) 3.0 ppb (3) 3.0 ppb (3) 2.3 ppb (3) 0.0 ppb (0) 38.0 ppb (36) 0.15 ppb (2) N/A 7.0 μg/m3 (30) 36.0
 
Feb. 21, 2021, midnight 2.1 ppb (2) 0.0 ppb (0) 2.4 ppb (3) 2.0 ppb (2) 1.7 ppb (2) 0.0 ppb (0) 39.0 ppb (37) 0.14 ppb (2) N/A 4.0 μg/m3 (17) 37.0
 
Feb. 20, 2021, 11 p.m. 2.2 ppb (3) 0.3 ppb (1) 2.3 ppb (3) 2.0 ppb (2) 1.5 ppb (2) 0.0 ppb (0) 40.0 ppb (38) 0.13 ppb (2) N/A 1.0 μg/m3 (5) 38.0
 
Feb. 20, 2021, 10 p.m. 1.6 ppb (2) 0.3 ppb (1) 2.1 ppb (2) 1.0 ppb (1) 1.2 ppb (2) 0.0 ppb (0) 40.0 ppb (38) 0.12 ppb (2) N/A 3.0 μg/m3 (13) 38.0
 
Feb. 20, 2021, 9 p.m. 2.1 ppb (2) 0.4 ppb (1) 2.5 ppb (3) 2.0 ppb (2) 1.4 ppb (2) 0.0 ppb (0) 40.0 ppb (38) 0.13 ppb (2) N/A 1.0 μg/m3 (5) 38.0
 
Feb. 20, 2021, 8 p.m. 1.9 ppb (2) 0.4 ppb (1) 2.4 ppb (3) 1.0 ppb (1) 1.3 ppb (2) 0.0 ppb (0) 41.0 ppb (38) 0.13 ppb (2) N/A 2.0 μg/m3 (9) 38.0
 
Feb. 20, 2021, 7 p.m. 3.4 ppb (4) 1.2 ppb (2) 4.0 ppb (4) 2.0 ppb (2) 2.2 ppb (3) 0.0 ppb (0) 39.0 ppb (37) 0.14 ppb (2) N/A 6.0 μg/m3 (25) 37.0
 
Feb. 20, 2021, 6 p.m. 4.6 ppb (5) 1.4 ppb (2) 5.3 ppb (5) 3.0 ppb (3) 2.9 ppb (3) 0.0 ppb (0) 35.0 ppb (33) 0.15 ppb (2) N/A 7.0 μg/m3 (30) 33.0
 
Feb. 20, 2021, 5 p.m. 6.1 ppb (6) 1.4 ppb (2) 6.8 ppb (7) 5.0 ppb (5) 4.0 ppb (4) 0.0 ppb (0) 32.0 ppb (30) 0.16 ppb (3) N/A 6.0 μg/m3 (25) 30.0
 
Feb. 20, 2021, 4 p.m. 7.1 ppb (7) 1.1 ppb (2) 7.6 ppb (8) 6.0 ppb (6) 5.2 ppb (5) 0.0 ppb (0) 30.0 ppb (28) 0.15 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 20, 2021, 3 p.m. 17.1 ppb (17) 3.2 ppb (4) 16.9 ppb (16) 14.0 ppb (14) 11.6 ppb (11) 0.0 ppb (0) 23.0 ppb (22) 0.2 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 20, 2021, 2 p.m. 14.3 ppb (14) 0.8 ppb (1) 14.3 ppb (14) 13.0 ppb (13) 11.0 ppb (11) 0.0 ppb (0) 23.0 ppb (22) 0.19 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 20, 2021, 1 p.m. 11.6 ppb (11) -0.1 ppb (0) 10.5 ppb (10) 12.0 ppb (12) 8.7 ppb (9) 0.0 ppb (0) 25.0 ppb (24) 0.17 ppb (3) N/A 5.0 μg/m3 (21) 24.0
 
Feb. 20, 2021, noon 5.9 ppb (6) -0.6 ppb (0) 7.0 ppb (7) 6.0 ppb (6) 5.8 ppb (6) 0.0 ppb (0) 27.0 ppb (25) 0.14 ppb (2) N/A 4.0 μg/m3 (17) 25.0
 
Feb. 20, 2021, 11 a.m. 3.7 ppb (4) -0.3 ppb (0) 4.3 ppb (5) 4.0 ppb (4) 3.5 ppb (4) 0.0 ppb (0) 32.0 ppb (30) 0.15 ppb (2) N/A 2.0 μg/m3 (9) 30.0
 
Feb. 20, 2021, 10 a.m. 2.7 ppb (3) -0.2 ppb (0) 3.8 ppb (4) 3.0 ppb (3) 2.9 ppb (3) 0.0 ppb (0) 30.0 ppb (28) 0.14 ppb (2) N/A 4.0 μg/m3 (17) 28.0
 
Feb. 20, 2021, 9 a.m. 2.8 ppb (3) -0.3 ppb (0) 3.9 ppb (4) 3.0 ppb (3) 3.1 ppb (3) 0.0 ppb (0) 29.0 ppb (27) 0.13 ppb (2) N/A 4.0 μg/m3 (17) 27.0
 
Feb. 20, 2021, 8 a.m. 2.9 ppb (3) -0.3 ppb (0) 4.1 ppb (4) 3.0 ppb (3) 3.1 ppb (3) 0.0 ppb (0) 30.0 ppb (28) 0.14 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 20, 2021, 7 a.m. 8.7 ppb (9) 1.2 ppb (2) 7.8 ppb (8) 8.0 ppb (8) 6.2 ppb (6) 0.0 ppb (0) 29.0 ppb (27) 0.17 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 20, 2021, 6 a.m. 10.2 ppb (10) 0.1 ppb (1) 11.3 ppb (11) 10.0 ppb (10) 9.4 ppb (9) 0.0 ppb (0) 22.0 ppb (21) 0.2 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 20, 2021, 5 a.m. 6.3 ppb (6) 0.2 ppb (1) 7.1 ppb (7) 6.0 ppb (6) 5.5 ppb (6) 0.0 ppb (0) 28.0 ppb (26) 0.16 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 20, 2021, 4 a.m. 4.8 ppb (5) 0.2 ppb (1) 5.1 ppb (5) 5.0 ppb (5) 3.8 ppb (4) 0.0 ppb (0) 31.0 ppb (29) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 29.0
 
Feb. 20, 2021, 3 a.m. 7.5 ppb (8) 0.0 ppb (0) 7.5 ppb (8) 8.0 ppb (8) 5.8 ppb (6) 0.0 ppb (0) 27.0 ppb (25) 0.16 ppb (3) N/A 4.0 μg/m3 (17) 25.0
 
Feb. 20, 2021, 2 a.m. 12.1 ppb (12) 0.9 ppb (1) 11.0 ppb (11) 11.0 ppb (11) 8.7 ppb (9) 0.0 ppb (0) 26.0 ppb (25) 0.19 ppb (3) N/A 3.0 μg/m3 (13) 25.0
 
Feb. 20, 2021, 1 a.m. 11.0 ppb (11) 0.9 ppb (1) 10.3 ppb (10) 10.0 ppb (10) 7.8 ppb (8) 0.0 ppb (0) 27.0 ppb (25) 0.19 ppb (3) N/A 5.0 μg/m3 (21) 25.0
 
Feb. 20, 2021, midnight 19.2 ppb (19) 4.6 ppb (5) 18.5 ppb (18) 15.0 ppb (15) 12.2 ppb (12) 0.0 ppb (0) 23.0 ppb (22) 0.22 ppb (3) N/A 5.0 μg/m3 (21) 22.0
 
Feb. 19, 2021, 11 p.m. 10.5 ppb (10) 1.6 ppb (2) 10.8 ppb (11) 9.0 ppb (9) 7.5 ppb (8) 0.0 ppb (0) 31.0 ppb (29) 0.17 ppb (3) N/A 3.0 μg/m3 (13) 29.0
 
Feb. 19, 2021, 10 p.m. 13.9 ppb (14) 4.0 ppb (4) 13.9 ppb (14) 10.0 ppb (10) 8.3 ppb (8) 0.0 ppb (0) 29.0 ppb (27) 0.18 ppb (3) N/A 5.0 μg/m3 (21) 27.0
 
Feb. 19, 2021, 9 p.m. 9.8 ppb (10) 2.6 ppb (3) 10.2 ppb (10) 7.0 ppb (7) 6.2 ppb (6) 0.0 ppb (0) 31.0 ppb (29) 0.16 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 19, 2021, 8 p.m. 8.5 ppb (9) 3.1 ppb (3) 8.6 ppb (9) 5.0 ppb (5) 4.4 ppb (5) 0.0 ppb (0) 35.0 ppb (33) 0.15 ppb (2) N/A 1.0 μg/m3 (5) 33.0
 
Feb. 19, 2021, 7 p.m. 8.6 ppb (9) 2.8 ppb (3) 8.1 ppb (8) 6.0 ppb (6) 4.5 ppb (5) 0.0 ppb (0) 36.0 ppb (34) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 34.0
 
Feb. 19, 2021, 6 p.m. 13.6 ppb (13) 4.6 ppb (5) 12.9 ppb (13) 9.0 ppb (9) 7.1 ppb (7) 0.0 ppb (0) 34.0 ppb (32) 0.16 ppb (3) N/A 3.0 μg/m3 (13) 32.0
 
Feb. 19, 2021, 5 p.m. 13.9 ppb (14) 4.7 ppb (5) 13.5 ppb (13) 9.0 ppb (9) 7.2 ppb (7) 0.0 ppb (0) 34.0 ppb (32) 0.16 ppb (3) N/A 2.0 μg/m3 (9) 32.0
 
Feb. 19, 2021, 4 p.m. 16.0 ppb (16) 5.6 ppb (6) 15.1 ppb (15) 10.0 ppb (10) 8.0 ppb (8) 0.0 ppb (0) 32.0 ppb (30) 0.16 ppb (3) N/A 2.0 μg/m3 (9) 30.0
 
Feb. 19, 2021, 3 p.m. 16.4 ppb (16) 3.4 ppb (4) 14.6 ppb (14) 13.0 ppb (13) 9.7 ppb (10) 0.0 ppb (0) 28.0 ppb (26) 0.18 ppb (3) N/A 5.0 μg/m3 (21) 26.0
 
Feb. 19, 2021, 2 p.m. 19.3 ppb (19) 2.1 ppb (2) 16.5 ppb (16) 17.0 ppb (17) 12.7 ppb (12) 0.0 ppb (0) 24.0 ppb (23) 0.23 ppb (3) N/A 4.0 μg/m3 (17) 23.0
 
Feb. 19, 2021, 1 p.m. 16.1 ppb (16) 0.5 ppb (1) 14.8 ppb (14) 16.0 ppb (16) 12.3 ppb (12) 0.0 ppb (0) 25.0 ppb (24) 0.22 ppb (3) N/A 4.0 μg/m3 (17) 24.0
 
Feb. 19, 2021, noon 9.1 ppb (9) -0.2 ppb (0) 8.4 ppb (8) 9.0 ppb (9) 6.9 ppb (7) 0.0 ppb (0) 31.0 ppb (29) 0.17 ppb (3) N/A 6.0 μg/m3 (25) 29.0
 
Feb. 19, 2021, 11 a.m. 3.9 ppb (4) -0.2 ppb (0) 3.9 ppb (4) 4.0 ppb (4) 3.0 ppb (3) 0.0 ppb (0) 38.0 ppb (36) 0.14 ppb (2) N/A 4.0 μg/m3 (17) 36.0
 
Feb. 19, 2021, 10 a.m. 2.8 ppb (3) -0.2 ppb (0) 2.8 ppb (3) 3.0 ppb (3) 2.1 ppb (2) 0.0 ppb (0) 39.0 ppb (37) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 37.0
 
Feb. 19, 2021, 9 a.m. 3.1 ppb (3) 0.0 ppb (0) 2.9 ppb (3) 3.0 ppb (3) 2.1 ppb (2) 0.0 ppb (0) 40.0 ppb (38) 0.13 ppb (2) N/A 3.0 μg/m3 (13) 38.0
 
Feb. 19, 2021, 8 a.m. 2.0 ppb (2) -0.1 ppb (0) 2.1 ppb (2) 2.0 ppb (2) 1.5 ppb (2) 0.0 ppb (0) 41.0 ppb (38) 0.13 ppb (2) N/A 6.0 μg/m3 (25) 38.0
 
Feb. 19, 2021, 7 a.m. 1.0 ppb (1) -0.7 ppb (0) 2.0 ppb (2) 2.0 ppb (2) 1.3 ppb (2) 0.0 ppb (0) 42.0 ppb (39) 0.13 ppb (2) N/A 7.0 μg/m3 (30) 39.0
 
Feb. 19, 2021, 6 a.m. 1.6 ppb (2) -0.2 ppb (0) 1.9 ppb (2) 2.0 ppb (2) 1.3 ppb (2) 0.0 ppb (0) 41.0 ppb (38) 0.12 ppb (2) N/A 6.0 μg/m3 (25) 38.0
 
Feb. 19, 2021, 5 a.m. 1.5 ppb (2) -0.1 ppb (0) 1.9 ppb (2) 2.0 ppb (2) 1.3 ppb (2) 0.0 ppb (0) 41.0 ppb (38) 0.13 ppb (2) N/A 5.0 μg/m3 (21) 38.0
 
Feb. 19, 2021, 4 a.m. 2.2 ppb (3) 0.0 ppb (0) 2.6 ppb (3) 2.0 ppb (2) 1.8 ppb (2) 0.0 ppb (0) 39.0 ppb (37) 0.13 ppb (2) N/A 6.0 μg/m3 (25) 37.0
 
Feb. 19, 2021, 3 a.m. 4.4 ppb (5) 0.4 ppb (1) 4.5 ppb (5) 4.0 ppb (4) 3.2 ppb (4) 0.0 ppb (0) 37.0 ppb (35) 0.15 ppb (2) N/A 2.0 μg/m3 (9) 35.0
 
Feb. 19, 2021, 2 a.m. 7.8 ppb (8) 0.0 ppb (0) 7.6 ppb (8) 8.0 ppb (8) 6.0 ppb (6) 0.0 ppb (0) 33.0 ppb (31) 0.16 ppb (3) N/A 2.0 μg/m3 (9) 31.0
 
Feb. 19, 2021, 1 a.m. 8.8 ppb (9) 0.3 ppb (1) 8.5 ppb (9) 8.0 ppb (8) 6.6 ppb (7) 0.0 ppb (0) 34.0 ppb (32) 0.17 ppb (3) N/A 4.0 μg/m3 (17) 32.0
 
Feb. 19, 2021, midnight 10.3 ppb (10) 1.1 ppb (2) 9.3 ppb (9) 9.0 ppb (9) 7.0 ppb (7) 0.0 ppb (0) 33.0 ppb (31) 0.18 ppb (3) N/A 5.0 μg/m3 (21) 31.0
 
Feb. 18, 2021, 11 p.m. 10.2 ppb (10) 2.0 ppb (2) 9.8 ppb (10) 8.0 ppb (8) 6.6 ppb (7) 0.0 ppb (0) 35.0 ppb (33) 0.18 ppb (3) N/A 2.0 μg/m3 (9) 33.0
 
Feb. 18, 2021, 10 p.m. 9.6 ppb (10) 2.3 ppb (3) 9.3 ppb (9) 7.0 ppb (7) 5.6 ppb (6) 0.0 ppb (0) 35.0 ppb (33) 0.16 ppb (3) N/A 2.0 μg/m3 (9) 33.0
 
Feb. 18, 2021, 9 p.m. 8.2 ppb (8) 2.6 ppb (3) 7.5 ppb (8) 6.0 ppb (6) 4.2 ppb (4) 0.0 ppb (0) 37.0 ppb (35) 0.15 ppb (2) N/A 1.0 μg/m3 (5) 35.0
 
Feb. 18, 2021, 8 p.m. 7.3 ppb (7) 2.3 ppb (3) 7.2 ppb (7) 5.0 ppb (5) 3.7 ppb (4) 0.0 ppb (0) 37.0 ppb (35) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 35.0
 
Feb. 18, 2021, 7 p.m. 8.3 ppb (8) 3.2 ppb (4) 8.1 ppb (8) 5.0 ppb (5) 3.9 ppb (4) 0.0 ppb (0) 36.0 ppb (34) 0.15 ppb (2) N/A 6.0 μg/m3 (25) 34.0
 
Feb. 18, 2021, 6 p.m. 8.1 ppb (8) 3.6 ppb (4) 7.7 ppb (8) 4.0 ppb (4) 3.7 ppb (4) 0.0 ppb (0) 35.0 ppb (33) 0.15 ppb (2) N/A 6.0 μg/m3 (25) 33.0
 
Feb. 18, 2021, 5 p.m. 10.3 ppb (10) 4.6 ppb (5) 10.2 ppb (10) 6.0 ppb (6) 4.7 ppb (5) 0.0 ppb (0) 32.0 ppb (30) 0.16 ppb (3) N/A 4.0 μg/m3 (17) 30.0
 
Feb. 18, 2021, 4 p.m. 19.4 ppb (19) 7.2 ppb (7) 18.3 ppb (18) 12.0 ppb (12) 9.3 ppb (9) 0.0 ppb (0) 26.0 ppb (25) 0.19 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 18, 2021, 3 p.m. 29.9 ppb (29) 9.0 ppb (9) 28.6 ppb (27) 21.0 ppb (20) 17.1 ppb (17) 0.0 ppb (0) 16.0 ppb (15) 0.24 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 18, 2021, 2 p.m. 33.9 ppb (32) 7.7 ppb (8) 29.6 ppb (28) 26.0 ppb (25) 20.7 ppb (20) 0.0 ppb (0) 11.0 ppb (11) 0.31 ppb (4) N/A 7.0 μg/m3 (30) 32.0
 
Feb. 18, 2021, 1 p.m. 45.1 ppb (43) 13.3 ppb (13) 41.9 ppb (40) 32.0 ppb (31) 26.4 ppb (25) 0.0 ppb (0) 2.0 ppb (2) 0.35 ppb (4) N/A 9.0 μg/m3 (38) 43.0
 
Feb. 18, 2021, noon 42.2 ppb (40) 12.1 ppb (12) 38.9 ppb (37) 30.0 ppb (29) 24.9 ppb (24) 0.0 ppb (0) 2.0 ppb (2) 0.35 ppb (4) N/A 9.0 μg/m3 (38) 40.0
 
Feb. 18, 2021, 11 a.m. 35.7 ppb (34) 7.3 ppb (7) 32.6 ppb (31) 28.0 ppb (27) 23.1 ppb (22) 0.0 ppb (0) 3.0 ppb (3) 0.32 ppb (4) N/A 17.0 μg/m3 (62) 62.0
 
Feb. 18, 2021, 10 a.m. 33.2 ppb (32) 4.5 ppb (5) 31.6 ppb (30) 29.0 ppb (28) 23.6 ppb (23) 0.0 ppb (0) 3.0 ppb (3) 0.34 ppb (4) N/A 16.0 μg/m3 (60) 60.0
 
Feb. 18, 2021, 9 a.m. 21.3 ppb (21) 1.6 ppb (2) 20.2 ppb (20) 20.0 ppb (19) 15.7 ppb (15) 0.0 ppb (0) 13.0 ppb (13) 0.24 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 18, 2021, 8 a.m. 16.0 ppb (16) 0.7 ppb (1) 16.0 ppb (16) 15.0 ppb (15) 13.2 ppb (13) 0.0 ppb (0) 20.0 ppb (19) 0.21 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 18, 2021, 7 a.m. 11.7 ppb (12) 0.1 ppb (1) 12.6 ppb (12) 12.0 ppb (12) 10.5 ppb (10) 0.0 ppb (0) 24.0 ppb (23) 0.2 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 18, 2021, 6 a.m. 11.5 ppb (11) 0.2 ppb (1) 12.1 ppb (12) 11.0 ppb (11) 9.7 ppb (10) 0.0 ppb (0) 25.0 ppb (24) 0.21 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 18, 2021, 5 a.m. 10.9 ppb (11) 0.0 ppb (0) 11.0 ppb (11) 11.0 ppb (11) 9.0 ppb (9) 0.0 ppb (0) 27.0 ppb (25) 0.2 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 18, 2021, 4 a.m. 13.7 ppb (13) 0.3 ppb (1) 13.7 ppb (13) 13.0 ppb (13) 11.0 ppb (11) 0.0 ppb (0) 26.0 ppb (25) 0.22 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 18, 2021, 3 a.m. 18.4 ppb (18) 1.6 ppb (2) 18.2 ppb (18) 17.0 ppb (17) 13.9 ppb (14) 0.0 ppb (0) 24.0 ppb (23) 0.24 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 18, 2021, 2 a.m. 8.3 ppb (8) 0.1 ppb (1) 8.6 ppb (9) 8.0 ppb (8) 7.0 ppb (7) 0.0 ppb (0) 34.0 ppb (32) 0.18 ppb (3) N/A 4.0 μg/m3 (17) 32.0
 
Feb. 18, 2021, 1 a.m. 5.8 ppb (6) -0.1 ppb (0) 6.4 ppb (7) 6.0 ppb (6) 5.2 ppb (5) 0.0 ppb (0) 38.0 ppb (36) 0.17 ppb (3) N/A 5.0 μg/m3 (21) 36.0
 
Feb. 18, 2021, midnight 3.4 ppb (4) 0.3 ppb (1) 4.0 ppb (4) 3.0 ppb (3) 2.8 ppb (3) 0.0 ppb (0) 43.0 ppb (40) 0.17 ppb (3) N/A 6.0 μg/m3 (25) 40.0
 
Feb. 17, 2021, 11 p.m. 2.1 ppb (2) 0.3 ppb (1) 2.8 ppb (3) 2.0 ppb (2) 1.7 ppb (2) 0.0 ppb (0) 45.0 ppb (42) 0.14 ppb (2) N/A 3.0 μg/m3 (13) 42.0