ID: 2009

AQSQID: 340410007

Site Name: Columbia

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

Updated: April 22, 2021, 10:44 a.m.

Location: Knowlton (Delaware Rd), NJ

Reporting: True, Located: True

Current AQI: 24.0

Knowlton (Delaware Rd) NJ, US: 40.924606, -75.067825

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
April 22, 2021, 9 a.m. 8.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A N/A N/A 5.7 μg/m3 (24) 24.0
 
April 22, 2021, 8 a.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 5.9 μg/m3 (25) 31.0
 
April 22, 2021, 7 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 5.3 μg/m3 (23) 31.0
 
April 22, 2021, 6 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 34.0 ppb (32) N/A N/A 3.7 μg/m3 (16) 32.0
 
April 22, 2021, 5 a.m. 7.0 ppb (7) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 33.0 ppb (31) N/A N/A N/A 31.0
 
April 22, 2021, 4 a.m. 7.0 ppb (7) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 4.4 μg/m3 (19) 30.0
 
April 22, 2021, 3 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 4.9 μg/m3 (21) 30.0
 
April 22, 2021, 2 a.m. 7.0 ppb (7) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 6.4 μg/m3 (27) 28.0
 
April 22, 2021, 1 a.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 6.7 μg/m3 (28) 28.0
 
April 22, 2021, midnight 13.0 ppb (13) 6.0 ppb (6) N/A 7.0 ppb (7) N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 5.0 μg/m3 (21) 27.0
 
April 21, 2021, 11 p.m. 15.0 ppb (15) 6.0 ppb (6) N/A 8.0 ppb (8) N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 4.4 μg/m3 (19) 30.0
 
April 21, 2021, 10 p.m. 10.0 ppb (10) 4.0 ppb (4) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 1.6 μg/m3 (7) 34.0
 
April 21, 2021, 9 p.m. 8.0 ppb (8) 4.0 ppb (4) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A N/A 35.0
 
April 21, 2021, 8 p.m. 11.0 ppb (11) 6.0 ppb (6) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 6.2 μg/m3 (26) 31.0
 
April 21, 2021, 7 p.m. 11.0 ppb (11) 6.0 ppb (6) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 10.7 μg/m3 (45) 45.0
 
April 21, 2021, 6 p.m. 13.0 ppb (13) 7.0 ppb (7) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 13.4 μg/m3 (54) 54.0
 
April 21, 2021, 5 p.m. 16.0 ppb (16) 8.0 ppb (8) N/A 8.0 ppb (8) N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 9.7 μg/m3 (41) 41.0
 
April 21, 2021, 4 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 47.0 ppb (44) N/A N/A 2.8 μg/m3 (12) 44.0
 
April 21, 2021, 3 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 45.0 ppb (42) N/A N/A 1.2 μg/m3 (5) 42.0
 
April 21, 2021, 2 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (38) N/A N/A -0.1 μg/m3 (0) 38.0
 
April 21, 2021, 1 p.m. 32.0 ppb (31) 17.0 ppb (17) N/A 14.0 ppb (14) N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A N/A 31.0
 
April 21, 2021, noon 31.0 ppb (30) 17.0 ppb (17) N/A 14.0 ppb (14) N/A 0.0 ppb (0) 16.0 ppb (15) N/A N/A 3.0 μg/m3 (13) 30.0
 
April 21, 2021, 11 a.m. 19.0 ppb (18) 7.0 ppb (7) N/A 11.0 ppb (11) N/A 0.0 ppb (0) 16.0 ppb (15) N/A N/A 5.0 μg/m3 (21) 21.0
 
April 21, 2021, 10 a.m. 15.0 ppb (15) 4.0 ppb (4) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A N/A N/A 6.2 μg/m3 (26) 26.0
 
April 21, 2021, 9 a.m. 18.0 ppb (17) 4.0 ppb (4) N/A 13.0 ppb (13) N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A 7.1 μg/m3 (30) 30.0
 
April 21, 2021, 8 a.m. 13.0 ppb (13) 2.0 ppb (2) N/A 10.0 ppb (10) N/A N/A 19.0 ppb (18) N/A N/A 9.1 μg/m3 (38) 38.0
 
April 21, 2021, 7 a.m. 19.0 ppb (18) 6.0 ppb (6) N/A 12.0 ppb (12) N/A 0.0 ppb (0) 18.0 ppb (17) N/A N/A 12.5 μg/m3 (52) 52.0
 
April 21, 2021, 6 a.m. 30.0 ppb (29) 13.0 ppb (13) N/A 17.0 ppb (17) N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A 14.2 μg/m3 (56) 56.0
 
April 21, 2021, 5 a.m. 31.0 ppb (30) 9.0 ppb (9) N/A 22.0 ppb (21) N/A N/A 14.0 ppb (13) N/A N/A N/A 30.0
 
April 21, 2021, 4 a.m. 40.0 ppb (38) 16.0 ppb (16) N/A 23.0 ppb (22) N/A 0.0 ppb (0) 18.0 ppb (17) N/A N/A 9.2 μg/m3 (39) 39.0
 
April 21, 2021, 3 a.m. 22.0 ppb (21) 6.0 ppb (6) N/A 15.0 ppb (15) N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 9.2 μg/m3 (39) 39.0
 
April 21, 2021, 2 a.m. 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 9.6 μg/m3 (40) 40.0
 
April 21, 2021, 1 a.m. 4.0 ppb (4) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 48.0 ppb (45) N/A N/A 9.6 μg/m3 (40) 45.0
 
April 21, 2021, midnight 14.0 ppb (14) 2.0 ppb (2) N/A 11.0 ppb (11) N/A 0.0 ppb (0) 43.0 ppb (40) N/A N/A 9.6 μg/m3 (40) 40.0
 
April 20, 2021, 11 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 56.0 ppb (55) N/A N/A 8.3 μg/m3 (35) 55.0
 
April 20, 2021, 10 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 55.0 ppb (51) N/A N/A 8.8 μg/m3 (37) 51.0
 
April 20, 2021, 9 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 55.0 ppb (51) N/A N/A N/A 51.0
 
April 20, 2021, 8 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 56.0 ppb (55) N/A N/A 4.8 μg/m3 (20) 55.0
 
April 20, 2021, 7 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 56.0 ppb (55) N/A N/A 2.9 μg/m3 (13) 55.0
 
April 20, 2021, 6 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 54.0 ppb (50) N/A N/A 4.1 μg/m3 (18) 50.0
 
April 20, 2021, 5 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 52.0 ppb (49) N/A N/A 3.3 μg/m3 (14) 49.0
 
April 20, 2021, 4 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 49.0 ppb (46) N/A N/A 3.0 μg/m3 (13) 46.0
 
April 20, 2021, 3 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (40) N/A N/A 2.5 μg/m3 (11) 40.0
 
April 20, 2021, 2 p.m. 9.0 ppb (9) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 1.0 ppb (2) 32.0 ppb (30) N/A N/A 4.0 μg/m3 (17) 30.0
 
April 20, 2021, 1 p.m. 13.0 ppb (13) 4.0 ppb (4) N/A 8.0 ppb (8) N/A 0.0 ppb (0) 20.0 ppb (19) N/A N/A N/A 19.0
 
April 20, 2021, noon 30.0 ppb (29) 16.0 ppb (16) N/A 14.0 ppb (14) N/A 0.0 ppb (0) 11.0 ppb (11) N/A N/A 15.2 μg/m3 (58) 58.0
 
April 20, 2021, 11 a.m. 183.0 ppb (117) 162.0 ppb (113) N/A 20.0 ppb (19) N/A 3.0 ppb (5) 0.0 ppb (0) N/A N/A 15.0 μg/m3 (58) 117.0
 
April 20, 2021, 10 a.m. 150.0 ppb (111) 134.0 ppb (108) N/A 16.0 ppb (16) N/A 2.0 ppb (3) N/A N/A N/A 15.1 μg/m3 (58) 111.0
 
April 20, 2021, 9 a.m. 142.0 ppb (109) 127.0 ppb (106) N/A 15.0 ppb (15) N/A 2.0 ppb (3) 0.0 ppb (0) N/A N/A 15.6 μg/m3 (59) 109.0
 
April 20, 2021, 8 a.m. 173.0 ppb (115) 155.0 ppb (112) N/A 17.0 ppb (17) N/A 3.0 ppb (5) 0.0 ppb (0) N/A N/A 16.7 μg/m3 (61) 115.0
 
April 20, 2021, 7 a.m. 159.0 ppb (112) 142.0 ppb (109) N/A 17.0 ppb (17) N/A 2.0 ppb (3) 0.0 ppb (0) N/A N/A 16.8 μg/m3 (61) 112.0
 
April 20, 2021, 6 a.m. 82.0 ppb (81) 65.0 ppb (63) N/A 16.0 ppb (16) N/A 1.0 ppb (2) 0.0 ppb (0) N/A N/A 16.3 μg/m3 (60) 81.0
 
April 20, 2021, 5 a.m. 102.0 ppb (102) 83.0 ppb (82) N/A 18.0 ppb (17) N/A N/A 0.0 ppb (0) N/A N/A N/A 102.0
 
April 20, 2021, 4 a.m. 79.0 ppb (78) 59.0 ppb (57) N/A 20.0 ppb (19) N/A 1.0 ppb (2) 0.0 ppb (0) N/A N/A 13.1 μg/m3 (54) 78.0
 
April 20, 2021, 3 a.m. 72.0 ppb (71) 53.0 ppb (50) N/A 19.0 ppb (18) N/A 0.0 ppb (0) 0.0 ppb (0) N/A N/A 11.9 μg/m3 (50) 71.0
 
April 20, 2021, 2 a.m. 64.0 ppb (62) 44.0 ppb (42) N/A 20.0 ppb (19) N/A 0.0 ppb (0) 0.0 ppb (0) N/A N/A 11.3 μg/m3 (48) 62.0
 
April 20, 2021, 1 a.m. 54.0 ppb (51) 34.0 ppb (33) N/A 19.0 ppb (18) N/A 0.0 ppb (0) 0.0 ppb (0) N/A N/A 10.3 μg/m3 (43) 51.0
 
April 20, 2021, midnight 38.0 ppb (36) 20.0 ppb (19) N/A 17.0 ppb (17) N/A 0.0 ppb (0) 3.0 ppb (3) N/A N/A 8.2 μg/m3 (35) 36.0
 
April 19, 2021, 11 p.m. 24.0 ppb (23) 9.0 ppb (9) N/A 14.0 ppb (14) N/A 0.0 ppb (0) 12.0 ppb (12) N/A N/A 6.2 μg/m3 (26) 26.0
 
April 19, 2021, 10 p.m. 31.0 ppb (30) 12.0 ppb (12) N/A 19.0 ppb (18) N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 8.1 μg/m3 (34) 34.0
 
April 19, 2021, 9 p.m. 7.0 ppb (7) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A N/A 38.0
 
April 19, 2021, 8 p.m. 15.0 ppb (15) 6.0 ppb (6) N/A 8.0 ppb (8) N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 3.9 μg/m3 (17) 38.0
 
April 19, 2021, 7 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 46.0 ppb (43) N/A N/A 2.9 μg/m3 (13) 43.0
 
April 19, 2021, 6 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 45.0 ppb (42) N/A N/A 2.6 μg/m3 (11) 42.0
 
April 19, 2021, 5 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (40) N/A N/A 2.8 μg/m3 (12) 40.0
 
April 19, 2021, 4 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 40.0 ppb (38) N/A N/A 1.8 μg/m3 (8) 38.0
 
April 19, 2021, 3 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 1.0 μg/m3 (5) 35.0
 
April 19, 2021, 2 p.m. 13.0 ppb (13) 6.0 ppb (6) N/A 7.0 ppb (7) N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 3.2 μg/m3 (14) 27.0
 
April 19, 2021, 1 p.m. 19.0 ppb (18) 9.0 ppb (9) N/A 9.0 ppb (9) N/A 0.0 ppb (0) 11.0 ppb (11) N/A N/A N/A 18.0
 
April 19, 2021, noon 33.0 ppb (32) 18.0 ppb (17) N/A 14.0 ppb (14) N/A 0.0 ppb (0) 6.0 ppb (6) N/A N/A 14.8 μg/m3 (57) 57.0
 
April 19, 2021, 11 a.m. 86.0 ppb (86) 70.0 ppb (69) N/A 15.0 ppb (15) N/A 1.0 ppb (2) 2.0 ppb (2) N/A N/A 17.3 μg/m3 (62) 86.0
 
April 19, 2021, 10 a.m. 113.0 ppb (104) 95.0 ppb (95) N/A 17.0 ppb (17) N/A 2.0 ppb (3) N/A N/A N/A 16.2 μg/m3 (60) 104.0
 
April 19, 2021, 9 a.m. 75.0 ppb (74) 59.0 ppb (57) N/A 15.0 ppb (15) N/A 1.0 ppb (2) N/A N/A N/A 14.6 μg/m3 (57) 74.0
 
April 19, 2021, 8 a.m. 96.0 ppb (96) 77.0 ppb (76) N/A 18.0 ppb (17) N/A N/A 0.0 ppb (0) N/A N/A 14.6 μg/m3 (57) 96.0
 
April 19, 2021, 7 a.m. 67.0 ppb (65) 48.0 ppb (46) N/A 19.0 ppb (18) N/A 0.0 ppb (0) 0.0 ppb (0) N/A N/A 14.8 μg/m3 (57) 65.0
 
April 19, 2021, 6 a.m. 45.0 ppb (43) 27.0 ppb (26) N/A 18.0 ppb (17) N/A 0.0 ppb (0) 0.0 ppb (0) N/A N/A 13.9 μg/m3 (55) 55.0
 
April 19, 2021, 5 a.m. 48.0 ppb (46) 29.0 ppb (28) N/A 18.0 ppb (17) N/A N/A 0.0 ppb (0) N/A N/A N/A 46.0
 
April 19, 2021, 4 a.m. 61.0 ppb (59) 39.0 ppb (37) N/A 21.0 ppb (20) N/A 0.0 ppb (0) 0.0 ppb (0) N/A N/A 12.2 μg/m3 (52) 59.0
 
April 19, 2021, 3 a.m. 81.0 ppb (80) 56.0 ppb (54) N/A 24.0 ppb (23) N/A 1.0 ppb (2) 0.0 ppb (0) N/A N/A 11.4 μg/m3 (48) 80.0
 
April 19, 2021, 2 a.m. 43.0 ppb (41) 21.0 ppb (20) N/A 22.0 ppb (21) N/A 0.0 ppb (0) 0.0 ppb (0) N/A N/A 10.4 μg/m3 (44) 44.0
 
April 19, 2021, 1 a.m. 44.0 ppb (42) 21.0 ppb (20) N/A 23.0 ppb (22) N/A 0.0 ppb (0) 0.0 ppb (0) N/A N/A 9.9 μg/m3 (42) 42.0
 
April 19, 2021, midnight 13.0 ppb (13) 2.0 ppb (2) N/A 10.0 ppb (10) N/A 0.0 ppb (0) 12.0 ppb (12) N/A N/A 7.4 μg/m3 (31) 31.0
 
April 18, 2021, 11 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 5.7 μg/m3 (24) 29.0
 
April 18, 2021, 10 p.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 3.9 μg/m3 (17) 36.0
 
April 18, 2021, 9 p.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A N/A 36.0
 
April 18, 2021, 8 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 5.1 μg/m3 (22) 35.0
 
April 18, 2021, 7 p.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 38.0 ppb (36) N/A N/A 4.3 μg/m3 (18) 36.0
 
April 18, 2021, 6 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 3.5 μg/m3 (15) 35.0
 
April 18, 2021, 5 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 37.0 ppb (35) N/A N/A 3.9 μg/m3 (17) 35.0
 
April 18, 2021, 4 p.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A 4.1 μg/m3 (18) 34.0
 
April 18, 2021, 3 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 35.0 ppb (33) N/A N/A 1.7 μg/m3 (8) 33.0
 
April 18, 2021, 2 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 1.2 μg/m3 (5) 31.0
 
April 18, 2021, 1 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A N/A 28.0
 
April 18, 2021, noon N/A N/A N/A N/A N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 3.9 μg/m3 (17) 29.0
 
April 18, 2021, 11 a.m. 4.0 ppb (4) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 6.8 μg/m3 (29) 29.0
 
April 18, 2021, 10 a.m. 19.0 ppb (18) 4.0 ppb (4) N/A 14.0 ppb (14) N/A 0.0 ppb (0) N/A N/A N/A 7.1 μg/m3 (30) 30.0
 
April 18, 2021, 9 a.m. 23.0 ppb (22) 6.0 ppb (6) N/A 16.0 ppb (16) N/A 0.0 ppb (0) 8.0 ppb (8) N/A N/A 6.4 μg/m3 (27) 27.0
 
April 18, 2021, 8 a.m. 10.0 ppb (10) 1.0 ppb (1) N/A 8.0 ppb (8) N/A 0.0 ppb (0) 21.0 ppb (20) N/A N/A 6.3 μg/m3 (27) 27.0
 
April 18, 2021, 7 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 7.7 μg/m3 (33) 33.0
 
April 18, 2021, 6 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 8.6 μg/m3 (36) 36.0
 
April 18, 2021, 5 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (24) N/A N/A N/A 24.0
 
April 18, 2021, 4 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 20.0 ppb (19) N/A N/A 6.4 μg/m3 (27) 27.0
 
April 18, 2021, 3 a.m. 15.0 ppb (15) 3.0 ppb (3) N/A 11.0 ppb (11) N/A 0.0 ppb (0) 16.0 ppb (15) N/A N/A 4.4 μg/m3 (19) 19.0
 
April 18, 2021, 2 a.m. 19.0 ppb (18) 5.0 ppb (5) N/A 13.0 ppb (13) N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A 4.0 μg/m3 (17) 18.0
 
April 18, 2021, 1 a.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 4.8 μg/m3 (20) 28.0
 
April 18, 2021, midnight 8.0 ppb (8) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 30.0 ppb (28) N/A N/A 5.5 μg/m3 (23) 28.0
 
April 17, 2021, 11 p.m. 6.0 ppb (6) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 5.5 μg/m3 (23) 31.0
 
April 17, 2021, 10 p.m. 14.0 ppb (14) 6.0 ppb (6) N/A 8.0 ppb (8) N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A 5.7 μg/m3 (24) 29.0
 
April 17, 2021, 9 p.m. 8.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A N/A 30.0
 
April 17, 2021, 8 p.m. 11.0 ppb (11) 5.0 ppb (5) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A 0.3 μg/m3 (2) 30.0
 
April 17, 2021, 7 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 34.0 ppb (32) N/A N/A -0.6 μg/m3 (0) 32.0
 
April 17, 2021, 6 p.m. 12.0 ppb (12) 6.0 ppb (6) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A -0.4 μg/m3 (0) 29.0
 
April 17, 2021, 5 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 32.0 ppb (30) N/A N/A -1.3 μg/m3 (0) 30.0
 
April 17, 2021, 4 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A -0.5 μg/m3 (0) 29.0
 
April 17, 2021, 3 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A -2.2 μg/m3 (0) 26.0
 
April 17, 2021, 2 p.m. 9.0 ppb (9) 4.0 ppb (4) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A -1.2 μg/m3 (0) 27.0
 
April 17, 2021, 1 p.m. 13.0 ppb (13) 6.0 ppb (6) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A N/A 27.0
 
April 17, 2021, noon 9.0 ppb (9) 4.0 ppb (4) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 27.0 ppb (25) N/A N/A 2.7 μg/m3 (12) 25.0
 
April 17, 2021, 11 a.m. 10.0 ppb (10) 3.0 ppb (3) N/A 7.0 ppb (7) N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A 2.1 μg/m3 (9) 22.0
 
April 17, 2021, 10 a.m. 14.0 ppb (14) 5.0 ppb (5) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A N/A N/A 1.7 μg/m3 (8) 14.0
 
April 17, 2021, 9 a.m. 7.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 2.2 μg/m3 (10) 24.0
 
April 17, 2021, 8 a.m. 10.0 ppb (10) 3.0 ppb (3) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A 2.6 μg/m3 (11) 22.0
 
April 17, 2021, 7 a.m. 15.0 ppb (15) 7.0 ppb (7) N/A 8.0 ppb (8) N/A 0.0 ppb (0) 18.0 ppb (17) N/A N/A 3.0 μg/m3 (13) 17.0
 
April 17, 2021, 6 a.m. 8.0 ppb (8) 4.0 ppb (4) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 20.0 ppb (19) N/A N/A 1.5 μg/m3 (7) 19.0
 
April 17, 2021, 5 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 19.0 ppb (18) N/A N/A N/A 18.0
 
April 17, 2021, 4 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 19.0 ppb (18) N/A N/A 2.6 μg/m3 (11) 18.0
 
April 17, 2021, 3 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 18.0 ppb (17) N/A N/A 4.0 μg/m3 (17) 17.0
 
April 17, 2021, 2 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 18.0 ppb (17) N/A N/A 4.6 μg/m3 (20) 20.0
 
April 17, 2021, 1 a.m. 12.0 ppb (12) 5.0 ppb (5) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 15.0 ppb (14) N/A N/A 4.5 μg/m3 (19) 19.0
 
April 17, 2021, midnight 7.0 ppb (7) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A 4.0 μg/m3 (17) 17.0
 
April 16, 2021, 11 p.m. 7.0 ppb (7) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 18.0 ppb (17) N/A N/A 4.1 μg/m3 (18) 18.0
 
April 16, 2021, 10 p.m. 8.0 ppb (8) 4.0 ppb (4) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 19.0 ppb (18) N/A N/A 3.6 μg/m3 (16) 18.0
 
April 16, 2021, 9 p.m. 9.0 ppb (9) 4.0 ppb (4) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 21.0 ppb (20) N/A N/A N/A 20.0
 
April 16, 2021, 8 p.m. 12.0 ppb (12) 6.0 ppb (6) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A -1.7 μg/m3 (0) 21.0
 
April 16, 2021, 7 p.m. 7.0 ppb (7) 3.0 ppb (3) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A -2.7 μg/m3 (0) 23.0
 
April 16, 2021, 6 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A -4.9 μg/m3 (0) 24.0
 
April 16, 2021, 5 p.m. 8.0 ppb (8) 4.0 ppb (4) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A -4.7 μg/m3 (0) 22.0
 
April 16, 2021, 4 p.m. 8.0 ppb (8) 4.0 ppb (4) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A -4.0 μg/m3 (0) 21.0
 
April 16, 2021, 3 p.m. 14.0 ppb (14) 9.0 ppb (9) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A -2.2 μg/m3 (0) 21.0
 
April 16, 2021, 2 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A -0.4 μg/m3 (0) 22.0
 
April 16, 2021, 1 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 23.0 ppb (22) N/A N/A N/A 22.0
 
April 16, 2021, noon 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 1.2 μg/m3 (5) 23.0
 
April 16, 2021, 11 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 25.0 ppb (24) N/A N/A 3.1 μg/m3 (13) 24.0
 
April 16, 2021, 10 a.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A 4.7 μg/m3 (20) 20.0
 
April 16, 2021, 9 a.m. 7.0 ppb (7) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 21.0 ppb (20) N/A N/A 6.9 μg/m3 (29) 29.0
 
April 16, 2021, 8 a.m. 22.0 ppb (21) 13.0 ppb (13) N/A 9.0 ppb (9) N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A 7.3 μg/m3 (31) 31.0
 
April 16, 2021, 7 a.m. 57.0 ppb (55) 37.0 ppb (35) N/A 19.0 ppb (18) N/A 0.0 ppb (0) 1.0 ppb (1) N/A N/A 7.5 μg/m3 (32) 55.0
 
April 16, 2021, 6 a.m. 27.0 ppb (26) 16.0 ppb (16) N/A 10.0 ppb (10) N/A 0.0 ppb (0) 10.0 ppb (10) N/A N/A 4.6 μg/m3 (20) 26.0
 
April 16, 2021, 5 a.m. 12.0 ppb (12) 6.0 ppb (6) N/A 6.0 ppb (6) N/A N/A 16.0 ppb (15) N/A N/A N/A 15.0
 
April 16, 2021, 4 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 20.0 ppb (19) N/A N/A 6.5 μg/m3 (28) 28.0
 
April 16, 2021, 3 a.m. 15.0 ppb (15) 7.0 ppb (7) N/A 8.0 ppb (8) N/A 0.0 ppb (0) 18.0 ppb (17) N/A N/A 6.4 μg/m3 (27) 27.0
 
April 16, 2021, 2 a.m. 23.0 ppb (22) 12.0 ppb (12) N/A 10.0 ppb (10) N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A 6.6 μg/m3 (28) 28.0
 
April 16, 2021, 1 a.m. 31.0 ppb (30) 17.0 ppb (17) N/A 13.0 ppb (13) N/A 0.0 ppb (0) 16.0 ppb (15) N/A N/A 6.7 μg/m3 (28) 30.0
 
April 16, 2021, midnight 22.0 ppb (21) 11.0 ppb (11) N/A 11.0 ppb (11) N/A 0.0 ppb (0) 20.0 ppb (19) N/A N/A 7.3 μg/m3 (31) 31.0
 
April 15, 2021, 11 p.m. 21.0 ppb (20) 9.0 ppb (9) N/A 11.0 ppb (11) N/A 0.0 ppb (0) 24.0 ppb (23) N/A N/A 7.4 μg/m3 (31) 31.0
 
April 15, 2021, 10 p.m. 40.0 ppb (38) 19.0 ppb (18) N/A 21.0 ppb (20) N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A 6.1 μg/m3 (26) 38.0
 
April 15, 2021, 9 p.m. 28.0 ppb (27) 14.0 ppb (14) N/A 13.0 ppb (13) N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A N/A 27.0
 
April 15, 2021, 8 p.m. 44.0 ppb (42) 23.0 ppb (22) N/A 21.0 ppb (20) N/A 0.0 ppb (0) 17.0 ppb (16) N/A N/A N/A 42.0
 
April 15, 2021, 7 p.m. 43.0 ppb (41) 22.0 ppb (21) N/A 20.0 ppb (19) N/A 0.0 ppb (0) 19.0 ppb (18) N/A N/A N/A 41.0
 
April 15, 2021, 6 p.m. 10.0 ppb (10) 3.0 ppb (3) N/A 7.0 ppb (7) N/A 0.0 ppb (0) 31.0 ppb (29) N/A N/A N/A 29.0
 
April 15, 2021, 5 p.m. 9.0 ppb (9) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 36.0 ppb (34) N/A N/A N/A 34.0
 
April 15, 2021, 4 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 39.0 ppb (37) N/A N/A 12.4 μg/m3 (52) 52.0
 
April 15, 2021, 3 p.m. 6.0 ppb (6) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 33.0 ppb (31) N/A N/A 15.9 μg/m3 (59) 59.0
 
April 15, 2021, 2 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 29.0 ppb (27) N/A N/A 16.8 μg/m3 (61) 61.0
 
April 15, 2021, 11 a.m. 42.0 ppb (40) 25.0 ppb (24) N/A 16.0 ppb (16) N/A 0.0 ppb (0) 2.0 ppb (2) N/A N/A 16.9 μg/m3 (62) 62.0
 
April 15, 2021, 10 a.m. 65.0 ppb (63) 45.0 ppb (43) N/A 20.0 ppb (19) N/A 1.0 ppb (2) N/A N/A N/A 16.3 μg/m3 (60) 63.0
 
April 15, 2021, 9 a.m. 81.0 ppb (80) 59.0 ppb (57) N/A 21.0 ppb (20) N/A 1.0 ppb (2) N/A N/A N/A 14.1 μg/m3 (56) 80.0
 
April 15, 2021, 8 a.m. 33.0 ppb (32) 16.0 ppb (16) N/A 17.0 ppb (17) N/A 0.0 ppb (0) 4.0 ppb (4) N/A N/A 13.5 μg/m3 (54) 54.0