ID: 7720

AQSQID: 840250170010

Site Name: Chelmsfordnr

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

Updated: Dec. 3, 2020, 5:41 p.m.

Location: Chelmsford (E Chelmsford), MA

Reporting: True, Located: True

Current AQI: 41.0

Chelmsford (E Chelmsford) MA, US: 42.612113, -71.307519

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Dec. 3, 2020, 3 p.m. 43.1 ppb (41) 24.8 ppb (24) N/A 18.0 ppb (17) N/A N/A 21.0 ppb (20) N/A N/A 4.0 μg/m3 (17) 41.0
 
Dec. 3, 2020, 2 p.m. 54.1 ppb (52) 33.0 ppb (32) N/A 21.0 ppb (20) N/A N/A 17.0 ppb (16) N/A N/A 4.0 μg/m3 (17) 52.0
 
Dec. 3, 2020, 1 p.m. 51.1 ppb (49) 29.5 ppb (28) N/A 22.0 ppb (21) N/A N/A 16.0 ppb (15) N/A N/A 4.0 μg/m3 (17) 49.0
 
Dec. 3, 2020, noon 60.0 ppb (58) 35.5 ppb (34) N/A 25.0 ppb (24) N/A N/A 12.0 ppb (12) N/A N/A 3.0 μg/m3 (13) 58.0
 
Dec. 3, 2020, 11 a.m. 67.5 ppb (66) 39.7 ppb (38) N/A 28.0 ppb (27) N/A N/A 9.0 ppb (9) N/A N/A 3.0 μg/m3 (13) 66.0
 
Dec. 3, 2020, 10 a.m. 63.1 ppb (61) 31.7 ppb (30) N/A 31.0 ppb (30) N/A N/A 5.0 ppb (5) N/A N/A 3.0 μg/m3 (13) 61.0
 
Dec. 3, 2020, 9 a.m. 45.1 ppb (43) 19.6 ppb (19) N/A 26.0 ppb (25) N/A N/A 12.0 ppb (12) N/A N/A 2.0 μg/m3 (9) 43.0
 
Dec. 3, 2020, 8 a.m. 35.9 ppb (34) 13.8 ppb (14) N/A 22.0 ppb (21) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 34.0
 
Dec. 3, 2020, 7 a.m. N/A N/A N/A N/A N/A N/A 18.0 ppb (17) N/A N/A 3.0 μg/m3 (13) 17.0
 
Dec. 3, 2020, 6 a.m. N/A N/A N/A N/A N/A N/A 28.0 ppb (26) N/A N/A 2.0 μg/m3 (9) 26.0
 
Dec. 3, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A 30.0 ppb (28) N/A N/A 2.0 μg/m3 (9) 28.0
 
Dec. 3, 2020, 4 a.m. 4.9 ppb (5) 1.9 ppb (2) N/A 3.0 ppb (3) N/A N/A 29.0 ppb (27) N/A N/A 3.0 μg/m3 (13) 27.0
 
Dec. 3, 2020, 3 a.m. 8.8 ppb (9) 3.7 ppb (4) N/A 5.0 ppb (5) N/A N/A 27.0 ppb (25) N/A N/A 3.0 μg/m3 (13) 25.0
 
Dec. 3, 2020, 2 a.m. 17.5 ppb (17) 8.4 ppb (8) N/A 9.0 ppb (9) N/A N/A 21.0 ppb (20) N/A N/A 2.0 μg/m3 (9) 20.0
 
Dec. 3, 2020, 1 a.m. 11.8 ppb (12) 5.1 ppb (5) N/A 7.0 ppb (7) N/A N/A 23.0 ppb (22) N/A N/A 2.0 μg/m3 (9) 22.0
 
Dec. 3, 2020, midnight 19.0 ppb (18) 9.2 ppb (9) N/A 10.0 ppb (10) N/A N/A 19.0 ppb (18) N/A N/A 2.0 μg/m3 (9) 18.0
 
Dec. 2, 2020, 11 p.m. 27.7 ppb (27) 14.4 ppb (14) N/A 13.0 ppb (13) N/A N/A 16.0 ppb (15) N/A N/A 2.0 μg/m3 (9) 27.0
 
Dec. 2, 2020, 10 p.m. 16.9 ppb (16) 8.1 ppb (8) N/A 9.0 ppb (9) N/A N/A 17.0 ppb (16) N/A N/A 4.0 μg/m3 (17) 17.0
 
Dec. 2, 2020, 9 p.m. 24.1 ppb (23) 11.0 ppb (11) N/A 13.0 ppb (13) N/A N/A 15.0 ppb (14) N/A N/A 4.0 μg/m3 (17) 23.0
 
Dec. 2, 2020, 8 p.m. 58.7 ppb (57) 37.5 ppb (36) N/A 21.0 ppb (20) N/A N/A 9.0 ppb (9) N/A N/A 4.0 μg/m3 (17) 57.0
 
Dec. 2, 2020, 7 p.m. 51.0 ppb (49) 33.0 ppb (32) N/A 18.0 ppb (17) N/A N/A 12.0 ppb (12) N/A N/A 4.0 μg/m3 (17) 49.0
 
Dec. 2, 2020, 6 p.m. 48.9 ppb (47) 31.9 ppb (31) N/A 17.0 ppb (17) N/A N/A 13.0 ppb (13) N/A N/A 4.0 μg/m3 (17) 47.0
 
Dec. 2, 2020, 5 p.m. 42.9 ppb (41) 28.1 ppb (27) N/A 15.0 ppb (15) N/A N/A 15.0 ppb (14) N/A N/A 4.0 μg/m3 (17) 41.0
 
Dec. 2, 2020, 4 p.m. 45.1 ppb (43) 29.5 ppb (28) N/A 16.0 ppb (16) N/A N/A 15.0 ppb (14) N/A N/A 4.0 μg/m3 (17) 43.0
 
Dec. 2, 2020, 3 p.m. 41.1 ppb (39) 27.4 ppb (26) N/A 14.0 ppb (14) N/A N/A 16.0 ppb (15) N/A N/A 4.0 μg/m3 (17) 39.0
 
Dec. 2, 2020, 2 p.m. 48.8 ppb (47) 34.2 ppb (33) N/A 15.0 ppb (15) N/A N/A 13.0 ppb (13) N/A N/A 4.0 μg/m3 (17) 47.0
 
Dec. 2, 2020, 1 p.m. 46.8 ppb (45) 31.0 ppb (30) N/A 16.0 ppb (16) N/A N/A 11.0 ppb (11) N/A N/A 4.0 μg/m3 (17) 45.0
 
Dec. 2, 2020, noon 52.3 ppb (50) 33.1 ppb (32) N/A 19.0 ppb (18) N/A N/A 7.0 ppb (7) N/A N/A 4.0 μg/m3 (17) 50.0
 
Dec. 2, 2020, 11 a.m. 60.2 ppb (58) 39.2 ppb (37) N/A 21.0 ppb (20) N/A N/A 6.0 ppb (6) N/A N/A 4.0 μg/m3 (17) 58.0
 
Dec. 2, 2020, 10 a.m. 40.5 ppb (39) 24.6 ppb (24) N/A 16.0 ppb (16) N/A N/A 10.0 ppb (10) N/A N/A 3.0 μg/m3 (13) 39.0
 
Dec. 2, 2020, 9 a.m. 22.1 ppb (21) 11.3 ppb (11) N/A 11.0 ppb (11) N/A N/A 16.0 ppb (15) N/A N/A 3.0 μg/m3 (13) 21.0
 
Dec. 2, 2020, 8 a.m. 16.8 ppb (16) 8.6 ppb (9) N/A 8.0 ppb (8) N/A N/A 17.0 ppb (16) N/A N/A 3.0 μg/m3 (13) 16.0
 
Dec. 2, 2020, 7 a.m. 12.2 ppb (12) 5.8 ppb (6) N/A 6.0 ppb (6) N/A N/A 20.0 ppb (19) N/A N/A 2.0 μg/m3 (9) 19.0
 
Dec. 2, 2020, 6 a.m. 13.1 ppb (13) 6.8 ppb (7) N/A 6.0 ppb (6) N/A N/A 20.0 ppb (19) N/A N/A 3.0 μg/m3 (13) 19.0
 
Dec. 2, 2020, 5 a.m. 12.3 ppb (12) 5.5 ppb (6) N/A 7.0 ppb (7) N/A N/A 16.0 ppb (15) N/A N/A 4.0 μg/m3 (17) 17.0
 
Dec. 2, 2020, 4 a.m. 15.0 ppb (15) 7.4 ppb (7) N/A 8.0 ppb (8) N/A N/A 15.0 ppb (14) N/A N/A 4.0 μg/m3 (17) 17.0
 
Dec. 2, 2020, 3 a.m. 17.6 ppb (17) 9.1 ppb (9) N/A 9.0 ppb (9) N/A N/A 15.0 ppb (14) N/A N/A 4.0 μg/m3 (17) 17.0
 
Dec. 2, 2020, 2 a.m. 14.5 ppb (14) 6.9 ppb (7) N/A 8.0 ppb (8) N/A N/A 15.0 ppb (14) N/A N/A 4.0 μg/m3 (17) 17.0
 
Dec. 2, 2020, 1 a.m. 23.3 ppb (22) 12.6 ppb (12) N/A 11.0 ppb (11) N/A N/A 18.0 ppb (17) N/A N/A 3.0 μg/m3 (13) 22.0
 
Dec. 2, 2020, midnight 15.4 ppb (15) 7.7 ppb (8) N/A 8.0 ppb (8) N/A N/A 24.0 ppb (23) N/A N/A 3.0 μg/m3 (13) 23.0
 
Dec. 1, 2020, 11 p.m. 25.2 ppb (24) 13.1 ppb (13) N/A 12.0 ppb (12) N/A N/A 26.0 ppb (25) N/A N/A 4.0 μg/m3 (17) 25.0
 
Dec. 1, 2020, 10 p.m. 21.3 ppb (21) 10.1 ppb (10) N/A 11.0 ppb (11) N/A N/A 30.0 ppb (28) N/A N/A 4.0 μg/m3 (17) 28.0
 
Dec. 1, 2020, 9 p.m. 24.9 ppb (24) 12.1 ppb (12) N/A 13.0 ppb (13) N/A N/A 28.0 ppb (26) N/A N/A 4.0 μg/m3 (17) 26.0
 
Dec. 1, 2020, 8 p.m. 28.1 ppb (27) 14.3 ppb (14) N/A 14.0 ppb (14) N/A N/A 28.0 ppb (26) N/A N/A 3.0 μg/m3 (13) 27.0
 
Dec. 1, 2020, 7 p.m. 28.1 ppb (27) 14.8 ppb (14) N/A 13.0 ppb (13) N/A N/A 29.0 ppb (27) N/A N/A 4.0 μg/m3 (17) 27.0
 
Dec. 1, 2020, 6 p.m. 26.9 ppb (26) 14.5 ppb (14) N/A 12.0 ppb (12) N/A N/A 23.0 ppb (22) N/A N/A 7.0 μg/m3 (30) 30.0
 
Dec. 1, 2020, 5 p.m. 36.0 ppb (34) 19.3 ppb (19) N/A 17.0 ppb (17) N/A N/A 19.0 ppb (18) N/A N/A 9.0 μg/m3 (38) 38.0
 
Dec. 1, 2020, 4 p.m. 44.2 ppb (42) 24.6 ppb (24) N/A 20.0 ppb (19) N/A N/A 17.0 ppb (16) N/A N/A 10.0 μg/m3 (42) 42.0
 
Dec. 1, 2020, 3 p.m. 43.8 ppb (42) 24.8 ppb (24) N/A 19.0 ppb (18) N/A N/A 16.0 ppb (15) N/A N/A 10.0 μg/m3 (42) 42.0
 
Dec. 1, 2020, 2 p.m. 46.5 ppb (44) 24.6 ppb (24) N/A 22.0 ppb (21) N/A N/A 14.0 ppb (13) N/A N/A 11.0 μg/m3 (46) 46.0
 
Dec. 1, 2020, 1 p.m. 45.2 ppb (43) 23.7 ppb (23) N/A 22.0 ppb (21) N/A N/A 15.0 ppb (14) N/A N/A 12.0 μg/m3 (50) 50.0
 
Dec. 1, 2020, noon 42.9 ppb (41) 20.6 ppb (20) N/A 22.0 ppb (21) N/A N/A 16.0 ppb (15) N/A N/A N/A 41.0
 
Dec. 1, 2020, 11 a.m. 28.4 ppb (27) 13.3 ppb (13) N/A 15.0 ppb (15) N/A N/A 25.0 ppb (24) N/A N/A 13.0 μg/m3 (53) 53.0
 
Dec. 1, 2020, 10 a.m. 20.3 ppb (20) 8.9 ppb (9) N/A 11.0 ppb (11) N/A N/A 28.0 ppb (26) N/A N/A 13.0 μg/m3 (53) 53.0
 
Dec. 1, 2020, 9 a.m. 10.3 ppb (10) 3.8 ppb (4) N/A 7.0 ppb (7) N/A N/A 33.0 ppb (31) N/A N/A 13.0 μg/m3 (53) 53.0
 
Dec. 1, 2020, 8 a.m. 9.1 ppb (9) 3.1 ppb (3) N/A 6.0 ppb (6) N/A N/A 34.0 ppb (32) N/A N/A 14.0 μg/m3 (55) 55.0
 
Dec. 1, 2020, 7 a.m. 7.2 ppb (7) 2.5 ppb (3) N/A 5.0 ppb (5) N/A N/A 35.0 ppb (33) N/A N/A 4.0 μg/m3 (17) 33.0
 
Dec. 1, 2020, 6 a.m. 8.6 ppb (9) 3.2 ppb (4) N/A 5.0 ppb (5) N/A N/A 34.0 ppb (32) N/A N/A 2.0 μg/m3 (9) 32.0
 
Dec. 1, 2020, 5 a.m. 7.7 ppb (8) 2.9 ppb (3) N/A 5.0 ppb (5) N/A N/A 34.0 ppb (32) N/A N/A 4.0 μg/m3 (17) 32.0
 
Dec. 1, 2020, 4 a.m. 11.6 ppb (11) 4.8 ppb (5) N/A 7.0 ppb (7) N/A N/A 32.0 ppb (30) N/A N/A 5.0 μg/m3 (21) 30.0
 
Dec. 1, 2020, 3 a.m. 8.2 ppb (8) 3.7 ppb (4) N/A 5.0 ppb (5) N/A N/A 34.0 ppb (32) N/A N/A 5.0 μg/m3 (21) 32.0
 
Dec. 1, 2020, 2 a.m. 9.7 ppb (10) 4.8 ppb (5) N/A 5.0 ppb (5) N/A N/A 34.0 ppb (32) N/A N/A 3.0 μg/m3 (13) 32.0
 
Dec. 1, 2020, 1 a.m. 7.1 ppb (7) 3.2 ppb (4) N/A 4.0 ppb (4) N/A N/A 35.0 ppb (33) N/A N/A 5.0 μg/m3 (21) 33.0
 
Dec. 1, 2020, midnight 8.0 ppb (8) 3.6 ppb (4) N/A 4.0 ppb (4) N/A N/A 35.0 ppb (33) N/A N/A 4.0 μg/m3 (17) 33.0
 
Nov. 30, 2020, 11 p.m. 9.1 ppb (9) 4.6 ppb (5) N/A 5.0 ppb (5) N/A N/A 36.0 ppb (34) N/A N/A 5.0 μg/m3 (21) 34.0
 
Nov. 30, 2020, 10 p.m. 7.6 ppb (8) 3.7 ppb (4) N/A 4.0 ppb (4) N/A N/A 36.0 ppb (34) N/A N/A 6.0 μg/m3 (25) 34.0
 
Nov. 30, 2020, 9 p.m. 12.2 ppb (12) 5.9 ppb (6) N/A 6.0 ppb (6) N/A N/A 36.0 ppb (34) N/A N/A 5.0 μg/m3 (21) 34.0
 
Nov. 30, 2020, 8 p.m. 16.9 ppb (16) 7.8 ppb (8) N/A 9.0 ppb (9) N/A N/A 30.0 ppb (28) N/A N/A 6.0 μg/m3 (25) 28.0
 
Nov. 30, 2020, 7 p.m. 19.7 ppb (19) 9.8 ppb (10) N/A 10.0 ppb (10) N/A N/A 28.0 ppb (26) N/A N/A 9.0 μg/m3 (38) 38.0
 
Nov. 30, 2020, 6 p.m. 19.6 ppb (19) 9.8 ppb (10) N/A 10.0 ppb (10) N/A N/A 27.0 ppb (25) N/A N/A 8.0 μg/m3 (34) 34.0
 
Nov. 30, 2020, 5 p.m. 44.1 ppb (42) 22.0 ppb (21) N/A 22.0 ppb (21) N/A N/A 12.0 ppb (12) N/A N/A 11.0 μg/m3 (46) 46.0
 
Nov. 30, 2020, 4 p.m. 62.1 ppb (60) 43.1 ppb (41) N/A 19.0 ppb (18) N/A N/A 2.0 ppb (2) N/A N/A 16.0 μg/m3 (60) 60.0
 
Nov. 30, 2020, 3 p.m. 63.3 ppb (61) 43.3 ppb (41) N/A 20.0 ppb (19) N/A N/A 2.0 ppb (2) N/A N/A 17.0 μg/m3 (62) 62.0
 
Nov. 30, 2020, 2 p.m. 65.3 ppb (64) 44.6 ppb (43) N/A 21.0 ppb (20) N/A N/A 3.0 ppb (3) N/A N/A 18.0 μg/m3 (64) 64.0
 
Nov. 30, 2020, 1 p.m. 90.9 ppb (91) 71.4 ppb (70) N/A 20.0 ppb (19) N/A N/A 2.0 ppb (2) N/A N/A 16.0 μg/m3 (60) 91.0
 
Nov. 30, 2020, noon 116.4 ppb (104) 100.0 ppb (100) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 16.0 μg/m3 (60) 104.0
 
Nov. 30, 2020, 11 a.m. 103.2 ppb (102) 89.0 ppb (89) N/A 14.0 ppb (14) N/A N/A 2.0 ppb (2) N/A N/A 13.0 μg/m3 (53) 102.0
 
Nov. 30, 2020, 10 a.m. 97.2 ppb (98) 81.4 ppb (81) N/A 16.0 ppb (16) N/A N/A 2.0 ppb (2) N/A N/A 13.0 μg/m3 (53) 98.0
 
Nov. 30, 2020, 9 a.m. 85.7 ppb (85) 68.6 ppb (67) N/A 17.0 ppb (17) N/A N/A 2.0 ppb (2) N/A N/A 14.0 μg/m3 (55) 85.0
 
Nov. 30, 2020, 8 a.m. 80.3 ppb (80) 62.8 ppb (61) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 15.0 μg/m3 (58) 80.0
 
Nov. 30, 2020, 7 a.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A N/A 14.0 μg/m3 (55) 55.0
 
Nov. 30, 2020, 6 a.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A N/A 16.0 μg/m3 (60) 60.0
 
Nov. 30, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A N/A 15.0 μg/m3 (58) 58.0
 
Nov. 30, 2020, 4 a.m. 80.3 ppb (80) 56.5 ppb (54) N/A 24.0 ppb (23) N/A N/A 2.0 ppb (2) N/A N/A 12.0 μg/m3 (50) 80.0
 
Nov. 30, 2020, 3 a.m. 77.1 ppb (76) 56.7 ppb (54) N/A 20.0 ppb (19) N/A N/A 2.0 ppb (2) N/A N/A 14.0 μg/m3 (55) 76.0
 
Nov. 30, 2020, 2 a.m. 76.2 ppb (75) 50.2 ppb (48) N/A 26.0 ppb (25) N/A N/A 2.0 ppb (2) N/A N/A 16.0 μg/m3 (60) 75.0
 
Nov. 30, 2020, 1 a.m. 97.6 ppb (98) 70.3 ppb (69) N/A 27.0 ppb (26) N/A N/A 2.0 ppb (2) N/A N/A 13.0 μg/m3 (53) 98.0
 
Nov. 30, 2020, midnight 76.8 ppb (76) 50.8 ppb (48) N/A 26.0 ppb (25) N/A N/A 2.0 ppb (2) N/A N/A 8.0 μg/m3 (34) 76.0
 
Nov. 29, 2020, 11 p.m. 61.5 ppb (59) 33.2 ppb (32) N/A 28.0 ppb (27) N/A N/A 3.0 ppb (3) N/A N/A 6.0 μg/m3 (25) 59.0
 
Nov. 29, 2020, 10 p.m. 51.4 ppb (49) 23.2 ppb (22) N/A 28.0 ppb (27) N/A N/A 7.0 ppb (7) N/A N/A 5.0 μg/m3 (21) 49.0
 
Nov. 29, 2020, 9 p.m. 45.7 ppb (44) 20.5 ppb (20) N/A 25.0 ppb (24) N/A N/A 12.0 ppb (12) N/A N/A 5.0 μg/m3 (21) 44.0
 
Nov. 29, 2020, 8 p.m. 31.0 ppb (30) 14.1 ppb (14) N/A 17.0 ppb (17) N/A N/A 23.0 ppb (22) N/A N/A 4.0 μg/m3 (17) 30.0
 
Nov. 29, 2020, 7 p.m. 23.8 ppb (23) 11.6 ppb (11) N/A 12.0 ppb (12) N/A N/A 25.0 ppb (24) N/A N/A 4.0 μg/m3 (17) 24.0
 
Nov. 29, 2020, 6 p.m. 16.8 ppb (16) 8.4 ppb (8) N/A 8.0 ppb (8) N/A N/A 27.0 ppb (25) N/A N/A 5.0 μg/m3 (21) 25.0
 
Nov. 29, 2020, 5 p.m. 16.0 ppb (16) 8.6 ppb (9) N/A 7.0 ppb (7) N/A N/A 27.0 ppb (25) N/A N/A 5.0 μg/m3 (21) 25.0
 
Nov. 29, 2020, 4 p.m. 15.7 ppb (15) 7.9 ppb (8) N/A 8.0 ppb (8) N/A N/A 26.0 ppb (25) N/A N/A 5.0 μg/m3 (21) 25.0
 
Nov. 29, 2020, 3 p.m. 12.3 ppb (12) 6.5 ppb (7) N/A 6.0 ppb (6) N/A N/A 26.0 ppb (25) N/A N/A 5.0 μg/m3 (21) 25.0
 
Nov. 29, 2020, 2 p.m. 13.9 ppb (14) 6.7 ppb (7) N/A 7.0 ppb (7) N/A N/A 24.0 ppb (23) N/A N/A 5.0 μg/m3 (21) 23.0
 
Nov. 29, 2020, 1 p.m. 14.7 ppb (14) 5.3 ppb (5) N/A 9.0 ppb (9) N/A N/A 18.0 ppb (17) N/A N/A 6.0 μg/m3 (25) 25.0
 
Nov. 29, 2020, noon 33.8 ppb (32) 15.2 ppb (15) N/A 19.0 ppb (18) N/A N/A 8.0 ppb (8) N/A N/A 6.0 μg/m3 (25) 32.0
 
Nov. 29, 2020, 11 a.m. 28.3 ppb (27) 9.7 ppb (10) N/A 19.0 ppb (18) N/A N/A 6.0 ppb (6) N/A N/A 6.0 μg/m3 (25) 27.0
 
Nov. 29, 2020, 10 a.m. 25.1 ppb (24) 8.5 ppb (9) N/A 17.0 ppb (17) N/A N/A 6.0 ppb (6) N/A N/A 6.0 μg/m3 (25) 25.0
 
Nov. 29, 2020, 9 a.m. 28.8 ppb (28) 13.5 ppb (13) N/A 15.0 ppb (15) N/A N/A 6.0 ppb (6) N/A N/A 6.0 μg/m3 (25) 28.0
 
Nov. 29, 2020, 8 a.m. 36.2 ppb (35) 18.2 ppb (18) N/A 18.0 ppb (17) N/A N/A 5.0 ppb (5) N/A N/A 6.0 μg/m3 (25) 35.0
 
Nov. 29, 2020, 7 a.m. 22.5 ppb (22) 6.7 ppb (7) N/A 16.0 ppb (16) N/A N/A 10.0 ppb (10) N/A N/A 6.0 μg/m3 (25) 25.0
 
Nov. 29, 2020, 6 a.m. 20.5 ppb (20) 6.6 ppb (7) N/A 14.0 ppb (14) N/A N/A 10.0 ppb (10) N/A N/A 6.0 μg/m3 (25) 25.0
 
Nov. 29, 2020, 5 a.m. 23.2 ppb (22) 9.1 ppb (9) N/A 14.0 ppb (14) N/A N/A 9.0 ppb (9) N/A N/A 7.0 μg/m3 (30) 30.0
 
Nov. 29, 2020, 4 a.m. 24.0 ppb (23) 8.6 ppb (9) N/A 15.0 ppb (15) N/A N/A 9.0 ppb (9) N/A N/A 8.0 μg/m3 (34) 34.0
 
Nov. 29, 2020, 3 a.m. 26.9 ppb (26) 9.3 ppb (9) N/A 18.0 ppb (17) N/A N/A 9.0 ppb (9) N/A N/A 8.0 μg/m3 (34) 34.0
 
Nov. 29, 2020, 2 a.m. 42.0 ppb (40) 21.3 ppb (21) N/A 21.0 ppb (20) N/A N/A 6.0 ppb (6) N/A N/A 8.0 μg/m3 (34) 40.0
 
Nov. 29, 2020, 1 a.m. 41.0 ppb (39) 17.6 ppb (17) N/A 23.0 ppb (22) N/A N/A 5.0 ppb (5) N/A N/A 9.0 μg/m3 (38) 39.0
 
Nov. 29, 2020, midnight 28.4 ppb (27) 11.7 ppb (12) N/A 17.0 ppb (17) N/A N/A 11.0 ppb (11) N/A N/A 7.0 μg/m3 (30) 30.0
 
Nov. 28, 2020, 11 p.m. 7.7 ppb (8) 1.7 ppb (2) N/A 6.0 ppb (6) N/A N/A 24.0 ppb (23) N/A N/A 6.0 μg/m3 (25) 25.0
 
Nov. 28, 2020, 10 p.m. 7.7 ppb (8) 2.3 ppb (3) N/A 5.0 ppb (5) N/A N/A 23.0 ppb (22) N/A N/A 12.0 μg/m3 (50) 50.0
 
Nov. 28, 2020, 9 p.m. 6.0 ppb (6) 1.9 ppb (2) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (24) N/A N/A 10.0 μg/m3 (42) 42.0
 
Nov. 28, 2020, 8 p.m. 6.1 ppb (6) 2.2 ppb (3) N/A 4.0 ppb (4) N/A N/A 30.0 ppb (28) N/A N/A 4.0 μg/m3 (17) 28.0
 
Nov. 28, 2020, 7 p.m. 9.4 ppb (9) 4.1 ppb (4) N/A 5.0 ppb (5) N/A N/A 28.0 ppb (26) N/A N/A 4.0 μg/m3 (17) 26.0
 
Nov. 28, 2020, 6 p.m. 7.5 ppb (8) 3.5 ppb (4) N/A 4.0 ppb (4) N/A N/A 28.0 ppb (26) N/A N/A 5.0 μg/m3 (21) 26.0
 
Nov. 28, 2020, 5 p.m. 14.7 ppb (14) 8.5 ppb (9) N/A 6.0 ppb (6) N/A N/A 24.0 ppb (23) N/A N/A 6.0 μg/m3 (25) 25.0
 
Nov. 28, 2020, 4 p.m. 8.7 ppb (9) 4.2 ppb (4) N/A 5.0 ppb (5) N/A N/A 23.0 ppb (22) N/A N/A 6.0 μg/m3 (25) 25.0
 
Nov. 28, 2020, 3 p.m. 25.1 ppb (24) 14.0 ppb (14) N/A 11.0 ppb (11) N/A N/A 13.0 ppb (13) N/A N/A 7.0 μg/m3 (30) 30.0
 
Nov. 28, 2020, 2 p.m. 37.3 ppb (36) 23.1 ppb (22) N/A 14.0 ppb (14) N/A N/A 6.0 ppb (6) N/A N/A 8.0 μg/m3 (34) 36.0
 
Nov. 28, 2020, 1 p.m. 46.5 ppb (44) 31.8 ppb (30) N/A 15.0 ppb (15) N/A N/A 3.0 ppb (3) N/A N/A 8.0 μg/m3 (34) 44.0
 
Nov. 28, 2020, noon 71.3 ppb (70) 59.7 ppb (58) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 70.0
 
Nov. 28, 2020, 11 a.m. 46.0 ppb (44) 35.2 ppb (34) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 44.0
 
Nov. 28, 2020, 10 a.m. 43.1 ppb (41) 31.7 ppb (30) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 41.0
 
Nov. 28, 2020, 9 a.m. 41.5 ppb (40) 30.1 ppb (29) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
Nov. 28, 2020, 8 a.m. 51.1 ppb (49) 38.8 ppb (37) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Nov. 28, 2020, 7 a.m. 38.9 ppb (37) 27.4 ppb (26) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Nov. 28, 2020, 6 a.m. 49.5 ppb (47) 38.2 ppb (37) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
Nov. 28, 2020, 5 a.m. 60.0 ppb (58) 47.4 ppb (45) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 58.0
 
Nov. 28, 2020, 4 a.m. 35.8 ppb (34) 23.6 ppb (23) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 14.0 μg/m3 (55) 55.0
 
Nov. 28, 2020, 3 a.m. 38.1 ppb (36) 25.7 ppb (25) N/A 13.0 ppb (13) N/A N/A 2.0 ppb (2) N/A N/A 12.0 μg/m3 (50) 50.0
 
Nov. 28, 2020, 2 a.m. 52.2 ppb (50) 37.0 ppb (35) N/A 15.0 ppb (15) N/A N/A 2.0 ppb (2) N/A N/A 11.0 μg/m3 (46) 50.0
 
Nov. 28, 2020, 1 a.m. 53.2 ppb (51) 35.5 ppb (34) N/A 18.0 ppb (17) N/A N/A 2.0 ppb (2) N/A N/A 10.0 μg/m3 (42) 51.0
 
Nov. 28, 2020, midnight 28.3 ppb (27) 10.2 ppb (10) N/A 18.0 ppb (17) N/A N/A 2.0 ppb (2) N/A N/A 9.0 μg/m3 (38) 38.0
 
Nov. 27, 2020, 11 p.m. 47.6 ppb (45) 30.9 ppb (30) N/A 17.0 ppb (17) N/A N/A 2.0 ppb (2) N/A N/A 9.0 μg/m3 (38) 45.0
 
Nov. 27, 2020, 10 p.m. 55.6 ppb (53) 41.0 ppb (39) N/A 15.0 ppb (15) N/A N/A 2.0 ppb (2) N/A N/A 9.0 μg/m3 (38) 53.0
 
Nov. 27, 2020, 9 p.m. 62.0 ppb (60) 47.1 ppb (45) N/A 15.0 ppb (15) N/A N/A 2.0 ppb (2) N/A N/A 8.0 μg/m3 (34) 60.0
 
Nov. 27, 2020, 8 p.m. 62.5 ppb (61) 46.5 ppb (44) N/A 16.0 ppb (16) N/A N/A 2.0 ppb (2) N/A N/A 9.0 μg/m3 (38) 61.0
 
Nov. 27, 2020, 7 p.m. 43.1 ppb (41) 27.7 ppb (27) N/A 16.0 ppb (16) N/A N/A 2.0 ppb (2) N/A N/A 8.0 μg/m3 (34) 41.0
 
Nov. 27, 2020, 6 p.m. 43.0 ppb (41) 28.1 ppb (27) N/A 15.0 ppb (15) N/A N/A 3.0 ppb (3) N/A N/A 8.0 μg/m3 (34) 41.0
 
Nov. 27, 2020, 5 p.m. 47.6 ppb (45) 32.6 ppb (31) N/A 15.0 ppb (15) N/A N/A 3.0 ppb (3) N/A N/A 8.0 μg/m3 (34) 45.0
 
Nov. 27, 2020, 4 p.m. 48.1 ppb (46) 34.5 ppb (33) N/A 14.0 ppb (14) N/A N/A 3.0 ppb (3) N/A N/A 7.0 μg/m3 (30) 46.0
 
Nov. 27, 2020, 3 p.m. 65.8 ppb (64) 52.6 ppb (50) N/A 13.0 ppb (13) N/A N/A 2.0 ppb (2) N/A N/A 7.0 μg/m3 (30) 64.0
 
Nov. 27, 2020, 2 p.m. 63.3 ppb (61) 50.3 ppb (48) N/A 13.0 ppb (13) N/A N/A 3.0 ppb (3) N/A N/A 7.0 μg/m3 (30) 61.0
 
Nov. 27, 2020, 1 p.m. 32.4 ppb (31) 21.8 ppb (21) N/A 11.0 ppb (11) N/A N/A 3.0 ppb (3) N/A N/A 5.0 μg/m3 (21) 31.0
 
Nov. 27, 2020, noon 36.6 ppb (35) 26.2 ppb (25) N/A 10.0 ppb (10) N/A N/A 2.0 ppb (2) N/A N/A 5.0 μg/m3 (21) 35.0
 
Nov. 27, 2020, 11 a.m. 50.2 ppb (48) 39.2 ppb (37) N/A 11.0 ppb (11) N/A N/A 2.0 ppb (2) N/A N/A 6.0 μg/m3 (25) 48.0
 
Nov. 27, 2020, 10 a.m. 28.2 ppb (27) 17.2 ppb (17) N/A 11.0 ppb (11) N/A N/A 2.0 ppb (2) N/A N/A 5.0 μg/m3 (21) 27.0
 
Nov. 27, 2020, 9 a.m. 22.5 ppb (22) 11.3 ppb (11) N/A 11.0 ppb (11) N/A N/A 2.0 ppb (2) N/A N/A 5.0 μg/m3 (21) 22.0
 
Nov. 27, 2020, 8 a.m. 14.3 ppb (14) 3.6 ppb (4) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Nov. 27, 2020, 7 a.m. N/A N/A N/A N/A N/A N/A 4.0 ppb (4) N/A N/A 5.0 μg/m3 (21) 21.0
 
Nov. 27, 2020, 6 a.m. N/A N/A N/A N/A N/A N/A 7.0 ppb (7) N/A N/A 5.0 μg/m3 (21) 21.0
 
Nov. 27, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A 8.0 ppb (8) N/A N/A 6.0 μg/m3 (25) 25.0
 
Nov. 27, 2020, 4 a.m. 11.2 ppb (11) 3.1 ppb (3) N/A 8.0 ppb (8) N/A N/A 6.0 ppb (6) N/A N/A 8.0 μg/m3 (34) 34.0
 
Nov. 27, 2020, 3 a.m. 14.0 ppb (14) 3.7 ppb (4) N/A 10.0 ppb (10) N/A N/A 4.0 ppb (4) N/A N/A 9.0 μg/m3 (38) 38.0
 
Nov. 27, 2020, 2 a.m. 11.1 ppb (11) 2.3 ppb (3) N/A 9.0 ppb (9) N/A N/A 5.0 ppb (5) N/A N/A 8.0 μg/m3 (34) 34.0
 
Nov. 27, 2020, 1 a.m. 12.4 ppb (12) 3.7 ppb (4) N/A 9.0 ppb (9) N/A N/A 5.0 ppb (5) N/A N/A 9.0 μg/m3 (38) 38.0
 
Nov. 27, 2020, midnight 10.9 ppb (11) 2.9 ppb (3) N/A 8.0 ppb (8) N/A N/A 6.0 ppb (6) N/A N/A 11.0 μg/m3 (46) 46.0
 
Nov. 26, 2020, 11 p.m. 11.8 ppb (12) 2.4 ppb (3) N/A 9.0 ppb (9) N/A N/A 4.0 ppb (4) N/A N/A 10.0 μg/m3 (42) 42.0
 
Nov. 26, 2020, 10 p.m. 12.3 ppb (12) 1.4 ppb (2) N/A 11.0 ppb (11) N/A N/A 3.0 ppb (3) N/A N/A 9.0 μg/m3 (38) 38.0
 
Nov. 26, 2020, 9 p.m. 13.5 ppb (13) 2.8 ppb (3) N/A 11.0 ppb (11) N/A N/A 3.0 ppb (3) N/A N/A 10.0 μg/m3 (42) 42.0
 
Nov. 26, 2020, 8 p.m. 14.9 ppb (15) 4.7 ppb (5) N/A 10.0 ppb (10) N/A N/A 4.0 ppb (4) N/A N/A 9.0 μg/m3 (38) 38.0
 
Nov. 26, 2020, 7 p.m. 16.7 ppb (16) 7.1 ppb (7) N/A 10.0 ppb (10) N/A N/A 4.0 ppb (4) N/A N/A 9.0 μg/m3 (38) 38.0
 
Nov. 26, 2020, 6 p.m. 20.7 ppb (20) 10.4 ppb (10) N/A 10.0 ppb (10) N/A N/A 4.0 ppb (4) N/A N/A 9.0 μg/m3 (38) 38.0
 
Nov. 26, 2020, 5 p.m. 29.9 ppb (29) 17.6 ppb (17) N/A 12.0 ppb (12) N/A N/A 3.0 ppb (3) N/A N/A 10.0 μg/m3 (42) 42.0
 
Nov. 26, 2020, 4 p.m. 22.2 ppb (21) 11.3 ppb (11) N/A 11.0 ppb (11) N/A N/A 4.0 ppb (4) N/A N/A 10.0 μg/m3 (42) 42.0