ID: 1373

AQSQID: 080350004

Site Name: Chatfield Park - 11500 N. Roxborough Park Rd.

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

Updated: April 21, 2021, 7:45 p.m.

Location: Littleton (Roxborough Park Rd), CO

Reporting: True, Located: True

Current AQI: 38.0

Littleton (Roxborough Park Rd) CO, US: 39.5339, -105.07

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
April 21, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (34) N/A N/A 8.9 μg/m3 (38) 38.0
 
April 21, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A N/A 8.1 μg/m3 (34) 38.0
 
April 21, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A N/A 7.6 μg/m3 (32) 39.0
 
April 21, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A N/A 7.1 μg/m3 (30) 39.0
 
April 21, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (44) N/A N/A 6.0 μg/m3 (25) 44.0
 
April 21, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (42) N/A N/A 5.9 μg/m3 (25) 42.0
 
April 21, 2021, noon N/A N/A N/A N/A N/A N/A 46.0 ppb (43) N/A N/A 5.4 μg/m3 (23) 43.0
 
April 21, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (44) N/A N/A 5.3 μg/m3 (23) 44.0
 
April 21, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (45) N/A N/A 5.1 μg/m3 (22) 45.0
 
April 21, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (46) N/A N/A 5.0 μg/m3 (21) 46.0
 
April 21, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (47) N/A N/A 4.9 μg/m3 (21) 47.0
 
April 21, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (45) N/A N/A 4.7 μg/m3 (20) 45.0
 
April 21, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (46) N/A N/A 4.7 μg/m3 (20) 46.0
 
April 21, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (45) N/A N/A 5.0 μg/m3 (21) 45.0
 
April 21, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (45) N/A N/A 5.1 μg/m3 (22) 45.0
 
April 21, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (50) N/A N/A 5.0 μg/m3 (21) 50.0
 
April 21, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (50) N/A N/A 5.0 μg/m3 (21) 50.0
 
April 21, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (50) N/A N/A 4.7 μg/m3 (20) 50.0
 
April 21, 2021, midnight N/A N/A N/A N/A N/A N/A 53.0 ppb (50) N/A N/A 4.4 μg/m3 (19) 50.0
 
April 20, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (50) N/A N/A 4.1 μg/m3 (18) 50.0
 
April 20, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 53.0 ppb (50) N/A N/A 4.2 μg/m3 (18) 50.0
 
April 20, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (51) N/A N/A 4.1 μg/m3 (18) 51.0
 
April 20, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (50) N/A N/A 3.7 μg/m3 (16) 50.0
 
April 20, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (46) N/A N/A N/A 46.0
 
April 20, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (47) N/A N/A 2.1 μg/m3 (9) 47.0
 
April 20, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (47) N/A N/A 2.1 μg/m3 (9) 47.0
 
April 20, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (44) N/A N/A 4.7 μg/m3 (20) 44.0
 
April 20, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A N/A 5.0 μg/m3 (21) 39.0
 
April 20, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A N/A 4.4 μg/m3 (19) 38.0
 
April 20, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A N/A 3.9 μg/m3 (17) 38.0
 
April 20, 2021, noon N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A N/A 3.5 μg/m3 (15) 38.0
 
April 20, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A N/A 4.4 μg/m3 (19) 38.0
 
April 20, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A N/A 4.0 μg/m3 (17) 39.0
 
April 20, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (41) N/A N/A 3.6 μg/m3 (16) 41.0
 
April 20, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (41) N/A N/A 3.2 μg/m3 (14) 41.0
 
April 20, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 44.0 ppb (41) N/A N/A 3.1 μg/m3 (13) 41.0
 
April 20, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A N/A 2.6 μg/m3 (11) 40.0
 
April 20, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A N/A 2.1 μg/m3 (9) 36.0
 
April 20, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (35) N/A N/A 3.3 μg/m3 (14) 35.0
 
April 20, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A N/A 2.9 μg/m3 (13) 36.0
 
April 20, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (34) N/A N/A 3.6 μg/m3 (16) 34.0
 
April 20, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (32) N/A N/A 3.5 μg/m3 (15) 32.0
 
April 20, 2021, midnight N/A N/A N/A N/A N/A N/A 32.0 ppb (30) N/A N/A 3.3 μg/m3 (14) 30.0
 
April 19, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (30) N/A N/A 3.1 μg/m3 (13) 30.0
 
April 19, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (26) N/A N/A 1.7 μg/m3 (8) 26.0
 
April 19, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (24) N/A N/A 2.0 μg/m3 (9) 24.0
 
April 19, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (21) N/A N/A 3.9 μg/m3 (17) 21.0
 
April 19, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (21) N/A N/A 5.0 μg/m3 (21) 21.0
 
April 19, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (20) N/A N/A 5.1 μg/m3 (22) 22.0
 
April 19, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (21) N/A N/A 5.7 μg/m3 (24) 24.0
 
April 19, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (21) N/A N/A 6.0 μg/m3 (25) 25.0
 
April 19, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (19) N/A N/A 7.1 μg/m3 (30) 30.0
 
April 19, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.1 μg/m3 (26) 26.0
 
April 19, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (32) N/A N/A 3.9 μg/m3 (17) 32.0
 
April 19, 2021, noon N/A N/A N/A N/A N/A N/A 36.0 ppb (34) N/A N/A 3.8 μg/m3 (16) 34.0
 
April 19, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A N/A 3.6 μg/m3 (16) 36.0
 
April 19, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A N/A 3.5 μg/m3 (15) 40.0
 
April 19, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A N/A 3.6 μg/m3 (16) 38.0
 
April 19, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A N/A 3.5 μg/m3 (15) 38.0
 
April 19, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A N/A 3.5 μg/m3 (15) 37.0
 
April 19, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A N/A 3.2 μg/m3 (14) 38.0
 
April 19, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (33) N/A N/A 3.5 μg/m3 (15) 33.0
 
April 19, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (31) N/A N/A 3.4 μg/m3 (15) 31.0
 
April 19, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (33) N/A N/A 3.3 μg/m3 (14) 33.0
 
April 19, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (32) N/A N/A 3.4 μg/m3 (15) 32.0
 
April 19, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A N/A 3.4 μg/m3 (15) 39.0
 
April 19, 2021, midnight N/A N/A N/A N/A N/A N/A 50.0 ppb (47) N/A N/A 3.3 μg/m3 (14) 47.0
 
April 18, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (47) N/A N/A 3.2 μg/m3 (14) 47.0
 
April 18, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (46) N/A N/A 3.1 μg/m3 (13) 46.0
 
April 18, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (46) N/A N/A 3.2 μg/m3 (14) 46.0
 
April 18, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 49.0 ppb (46) N/A N/A 3.1 μg/m3 (13) 46.0
 
April 18, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 51.0 ppb (48) N/A N/A 3.3 μg/m3 (14) 48.0
 
April 18, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (49) N/A N/A 3.6 μg/m3 (16) 49.0
 
April 18, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (50) N/A N/A 3.8 μg/m3 (16) 50.0
 
April 18, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (47) N/A N/A 4.0 μg/m3 (17) 47.0
 
April 18, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 48.0 ppb (45) N/A N/A 4.2 μg/m3 (18) 45.0
 
April 18, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (44) N/A N/A 4.2 μg/m3 (18) 44.0
 
April 18, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (42) N/A N/A 4.1 μg/m3 (18) 42.0
 
April 18, 2021, noon N/A N/A N/A N/A N/A N/A 44.0 ppb (41) N/A N/A 4.0 μg/m3 (17) 41.0
 
April 18, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A N/A 3.9 μg/m3 (17) 38.0
 
April 18, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A N/A 4.0 μg/m3 (17) 38.0
 
April 18, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A N/A 4.1 μg/m3 (18) 38.0
 
April 18, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A N/A 4.1 μg/m3 (18) 38.0
 
April 18, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A N/A 4.2 μg/m3 (18) 38.0
 
April 18, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A N/A 4.4 μg/m3 (19) 38.0
 
April 18, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A N/A 5.2 μg/m3 (22) 40.0
 
April 18, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 43.0 ppb (40) N/A N/A 5.5 μg/m3 (23) 40.0
 
April 18, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 47.0 ppb (44) N/A N/A 6.5 μg/m3 (28) 44.0
 
April 18, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (42) N/A N/A 5.6 μg/m3 (24) 42.0
 
April 18, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 50.0 ppb (47) N/A N/A 5.1 μg/m3 (22) 47.0
 
April 18, 2021, midnight N/A N/A N/A N/A N/A N/A 54.0 ppb (50) N/A N/A 5.3 μg/m3 (23) 50.0
 
April 17, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 55.0 ppb (51) N/A N/A 5.5 μg/m3 (23) 51.0
 
April 17, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 56.0 ppb (55) N/A N/A 6.4 μg/m3 (27) 55.0
 
April 17, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 54.0 ppb (50) N/A N/A 6.6 μg/m3 (28) 50.0
 
April 17, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 52.0 ppb (49) N/A N/A 6.3 μg/m3 (27) 49.0
 
April 17, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 46.0 ppb (43) N/A N/A 5.8 μg/m3 (25) 43.0
 
April 17, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A N/A 5.0 μg/m3 (21) 38.0
 
April 17, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A N/A 4.1 μg/m3 (18) 37.0
 
April 17, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 41.0 ppb (38) N/A N/A 3.4 μg/m3 (15) 38.0
 
April 17, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A N/A 3.3 μg/m3 (14) 38.0
 
April 17, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A N/A 3.0 μg/m3 (13) 38.0
 
April 17, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A N/A 3.4 μg/m3 (15) 37.0
 
April 17, 2021, noon N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A N/A 3.4 μg/m3 (15) 36.0
 
April 17, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A N/A 3.6 μg/m3 (16) 37.0
 
April 17, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A N/A 3.4 μg/m3 (15) 38.0
 
April 17, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A N/A 3.7 μg/m3 (16) 37.0
 
April 17, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A N/A 4.2 μg/m3 (18) 36.0
 
April 17, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A N/A 3.5 μg/m3 (15) 38.0
 
April 17, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (33) N/A N/A 4.9 μg/m3 (21) 33.0
 
April 17, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (32) N/A N/A 7.3 μg/m3 (31) 32.0
 
April 17, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (31) N/A N/A 9.1 μg/m3 (38) 38.0
 
April 17, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (35) N/A N/A 6.8 μg/m3 (29) 35.0
 
April 17, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A N/A 5.9 μg/m3 (25) 36.0
 
April 17, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A N/A 6.2 μg/m3 (26) 37.0
 
April 17, 2021, midnight N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A N/A 5.6 μg/m3 (24) 39.0
 
April 16, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (42) N/A N/A 6.0 μg/m3 (25) 42.0
 
April 16, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 45.0 ppb (42) N/A N/A 6.0 μg/m3 (25) 42.0
 
April 16, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 42.0 ppb (39) N/A N/A 4.6 μg/m3 (20) 39.0
 
April 16, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 40.0 ppb (38) N/A N/A 5.1 μg/m3 (22) 38.0
 
April 16, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 39.0 ppb (37) N/A N/A 5.8 μg/m3 (25) 37.0
 
April 16, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (33) N/A N/A 6.5 μg/m3 (28) 33.0
 
April 16, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (31) N/A N/A 7.1 μg/m3 (30) 31.0
 
April 16, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (28) N/A N/A 1.6 μg/m3 (7) 28.0
 
April 16, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (27) N/A N/A 1.5 μg/m3 (7) 27.0
 
April 16, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (24) N/A N/A 4.1 μg/m3 (18) 24.0
 
April 16, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (23) N/A N/A 5.1 μg/m3 (22) 23.0
 
April 16, 2021, noon N/A N/A N/A N/A N/A N/A 23.0 ppb (22) N/A N/A 5.8 μg/m3 (25) 25.0
 
April 16, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (21) N/A N/A 6.5 μg/m3 (28) 28.0
 
April 16, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (22) N/A N/A 5.8 μg/m3 (25) 25.0
 
April 16, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (23) N/A N/A 5.4 μg/m3 (23) 23.0
 
April 16, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 25.0 ppb (24) N/A N/A 5.1 μg/m3 (22) 24.0
 
April 16, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (23) N/A N/A 5.1 μg/m3 (22) 23.0
 
April 16, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (23) N/A N/A 4.4 μg/m3 (19) 23.0
 
April 16, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (22) N/A N/A 4.8 μg/m3 (20) 22.0
 
April 16, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 20.0 ppb (19) N/A N/A 4.7 μg/m3 (20) 20.0
 
April 16, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (21) N/A N/A 3.9 μg/m3 (17) 21.0
 
April 16, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (21) N/A N/A 4.1 μg/m3 (18) 21.0
 
April 16, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (20) N/A N/A 4.1 μg/m3 (18) 20.0
 
April 16, 2021, midnight N/A N/A N/A N/A N/A N/A 20.0 ppb (19) N/A N/A 3.3 μg/m3 (14) 19.0
 
April 15, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (21) N/A N/A 6.4 μg/m3 (27) 27.0
 
April 15, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (22) N/A N/A 13.0 μg/m3 (53) 53.0
 
April 15, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (23) N/A N/A 14.5 μg/m3 (57) 57.0
 
April 15, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (25) N/A N/A 13.9 μg/m3 (55) 55.0
 
April 15, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (26) N/A N/A 12.3 μg/m3 (52) 52.0
 
April 15, 2021, 6 p.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (26) N/A N/A 11.4 μg/m3 (48) 48.0
 
April 15, 2021, 5 p.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (25) N/A N/A 10.3 μg/m3 (43) 43.0
 
April 15, 2021, 4 p.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (25) N/A N/A 10.0 μg/m3 (42) 42.0
 
April 15, 2021, 3 p.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (25) N/A N/A 10.9 μg/m3 (46) 46.0
 
April 15, 2021, 2 p.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (22) N/A N/A 10.0 μg/m3 (42) 42.0
 
April 15, 2021, 1 p.m. N/A N/A N/A N/A N/A N/A 24.0 ppb (23) N/A N/A 8.7 μg/m3 (37) 37.0
 
April 15, 2021, noon N/A N/A N/A N/A N/A N/A 23.0 ppb (22) N/A N/A 7.2 μg/m3 (31) 31.0
 
April 15, 2021, 11 a.m. N/A N/A N/A N/A N/A N/A 27.0 ppb (25) N/A N/A 6.7 μg/m3 (28) 28.0
 
April 15, 2021, 10 a.m. N/A N/A N/A N/A N/A N/A 29.0 ppb (27) N/A N/A 6.6 μg/m3 (28) 28.0
 
April 15, 2021, 9 a.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (29) N/A N/A 6.1 μg/m3 (26) 29.0
 
April 15, 2021, 8 a.m. N/A N/A N/A N/A N/A N/A 32.0 ppb (30) N/A N/A 5.9 μg/m3 (25) 30.0
 
April 15, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (29) N/A N/A 5.8 μg/m3 (25) 29.0
 
April 15, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (29) N/A N/A 6.5 μg/m3 (28) 29.0
 
April 15, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 31.0 ppb (29) N/A N/A 11.1 μg/m3 (47) 47.0
 
April 15, 2021, 4 a.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (35) N/A N/A 11.7 μg/m3 (49) 49.0
 
April 15, 2021, 3 a.m. N/A N/A N/A N/A N/A N/A 35.0 ppb (33) N/A N/A 12.1 μg/m3 (51) 51.0
 
April 15, 2021, 2 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (31) N/A N/A 11.9 μg/m3 (50) 50.0
 
April 15, 2021, 1 a.m. N/A N/A N/A N/A N/A N/A 33.0 ppb (31) N/A N/A 12.0 μg/m3 (50) 50.0
 
April 15, 2021, midnight N/A N/A N/A N/A N/A N/A 32.0 ppb (30) N/A N/A 11.8 μg/m3 (50) 50.0
 
April 14, 2021, 11 p.m. N/A N/A N/A N/A N/A N/A 34.0 ppb (32) N/A N/A 11.6 μg/m3 (49) 49.0
 
April 14, 2021, 10 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (34) N/A N/A 11.5 μg/m3 (48) 48.0
 
April 14, 2021, 9 p.m. N/A N/A N/A N/A N/A N/A 36.0 ppb (34) N/A N/A 10.4 μg/m3 (44) 44.0
 
April 14, 2021, 8 p.m. N/A N/A N/A N/A N/A N/A 38.0 ppb (36) N/A N/A 9.5 μg/m3 (40) 40.0
 
April 14, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A 37.0 ppb (35) N/A N/A 8.4 μg/m3 (36) 36.0